ERCO Lichtbericht 94

Published in April 2012 

E Lichtbericht 94 

Benetton megastores, Vienna 

The LED is conquering the retail 

sector. From shop window to 

sweater shelf, new projects such as 

the Benetton stores in Vienna are 

now illuminated throughout with 

LED technology from ERCO, which 

has proven highly effective and 

economically efficient. But the new 

technology is now also presenting 

itself in a fresh look, underlined 

and enhanced by the unique light 

qualities of the LED lighting tools. 

Whether shop, museum or façade 

illumination – this Lichtbericht 

again shows 100% LED.

Introduction 

Report 

Background 

1 

2 

4 

6 

Contents About this issue 

About this issue 

Keylights 

Bright prospects 

LED conquers the fashion world: 

Benetton megastores, Vienna 

The new megastore of the Italian 

fashion brand United Colors of Benetton 

in Vienna is presenting itself in an 

aesthetically and technically innovative 

fashion – illuminated exclusively by 

ERCO LED lighting tools. 

10 Expert talk: The LED – more than a 

new type of lamp 

We are slowly beginning to realise just 

how profoundly the LED will change the 

luminaire industry. Armin Scharf talks to 

experts at ERCO. 

Projects 

24 

26 

ERCO Lichtbericht 

Imprint 

Publisher: Tim H. Maack 

Editor in Chief: Martin Krautter 

Design/Layout: Simone Heinze, Christoph Steinke 

Printing: Mohn Media Mohndruck GmbH, Gütersloh 

1028768000 

© 2012 ERCO 

Light & Technology 

14 

18 

20 

22 

23 

30 

LED spotlights with RGBW 

varychrome technology 

The new allrounders among the 

lighting tools 

ERCO Technical Centre 

LED case study: New light for 

conference rooms 


LED case study: RGBW wallwashing in 

the representative office 

Focus 

Doublefocus downlights in use 

Double focus 

Technology of LED doublefocus 

downlights 

Palazzo Bembo, Venice 

Historical architecture, contemporary 

art, visionary lighting: ERCO LED 

technology proves its fine qualities in 

Palazzo Bembo exhibition halls. 

Museum im Palais, Graz 

The treasury of Styria: a further example 

of an institute of worldwide significance 

that has opted for ERCO’s LED technology 

in its galleries. 

ECE Center Thier-Galerie, Dortmund 

An economic keystone and city landmark: 

the new shopping centre “Thier 

Galerie” in Dortmund's city centre. LED 

lighting tools by ERCO enhance its striking 

appearance. 

32 Backlights 

Photographs (Page): Andreu Adrover (32), 

Julia Cawley (1), Aksel Gross/Electric Gobo (14), 

Alexandra Lechner (2), Thomas Mayer (2, 3, 4–5, 

24–25), Rudi Meisel (U1, 2, 3, 6–9, 26–29), 

Alexander Ring (10–13, 14–21, 33), Dirk Vogel (2, 

30–31, 32, 33), Sabine Wenzel (2), Michael Wolf 

(U4), Edgar Zippel (2, 3) 

Translation: Lanzillotta Translations, Düsseldorf 

Tim Henrik Maack 

After outdoor applications and museum lighting, 

LED lighting solutions are now also conquering 

the retail sector. Italian fashion brand 

United Colors of Benetton has illuminated two 

of its megastores in Vienna throughout with 

ERCO LED lighting tools. Starting with façade 

lighting through to scenic window displays all 

the way to the presentation of its merchandise 

on the shop floor. In contrast to the old HIT 

lighting, the new LED concept appeals not only 

on an aesthetic level; the connected load could, 

as a result, be reduced from around 140kW to 

now 50kW. A lighting solution, then, that is as 

sustainable as it is effective. 

From page 10, the LED plays an important role 

in a talk with experts. The aim of this talk conducted 

by Armin Scharf was to show how the 

LED is changing luminaires and, as a result, the 

luminaire industry. It also provides a look behind 

the scenes of the technology change at ERCO. 

New technologies necessitate a new approach 

to the product. Dealing with these technologies 

requires, as it were, a feat of translation from 

technology to culture. Our old established credo 

of “light, not luminaires” is very much coming 

into effect here. The technology of the luminaire 

is fundamentally redefined by the LED, whereas 

light as a cultural concept requires reliable qualities, 

but at the same time spreads because of an 

altogether new scope for design. 

An impression of new qualities in lighting 

design is given on page 14 in an article on ERCO’s 

RGBW varychrome technology. Variable light 

colour, brightness and subtle white nuances turn 

spotlights with this technology into veritable 

allrounders among the lighting tools. The result 

is a vast spectrum of new creative potential for 

lighting design. Whether saturated colours or 

the various shades of white along the Planckian 

locus – there is no limit to the creative scope. 

LED light in the museum is described on page 

24 featuring the Palazzo Bembo in Venice: historical 

architecture looking out over the Rialto 

bridge; inside, contemporary art effectively 

illuminated by Logotec LED spotlights. In Graz, 

the Museum im Palais is a further example of 

museum lighting with LEDs. The collection in 

the refurbished Palais Herberstein is part of the 

Joanneum Universal Museum. Here, the works 

of art are effectively staged using LED technology, 

while ERCO’s lighting tools produce an 

equally impressive atmosphere in outdoor areas. 

All things considered, there is no question 

that LED technology is well on its way and is 

now successfully used in many different types 

of project. At the Light+Building trade fair in 

Frankfurt, we will further showcase the technology 

change towards LEDs. We look forward 

to welcoming you there. 

ERCO Lichtbericht 94 1

Keylights 

2 ERCO Lichtbericht 94 

Vienna 

Swiss parquet flooring manufacturer 

Bauwerk presents its high-end 

products in the design stores of 

the Stilwerk chain – after Hamburg 

and Düsseldorf now also in Vienna’s 

Stilwerk on Praterstraße. Optec 

spotlights and Quintessence downlights 

and wallwashers optimally 

accentuate the high-quality wood. 

Bauwerk parquet flooring store, 

Stilwerk, Vienna 

Architect: Stephen Williams Associates, 

Hamburg 

www.bauwerk-parkett.com 

Turin 

Once a palace of the kings of 

Savoy, the Venaria Reale has now 

undergone extensive reconstructions 

transforming it into an extraordinary 

museum and a lively cultural 

centre. Today, it is equipped 

with cutting-edge technology 

– some galleries even with Cantax 

LED spotlights from ERCO. 

Venaria Reale, permanent exhibition, 

Turin 

Project team: Architect Salvatore 

Simonetti, architect Stefano Faletti 

(consultant), Dr. Alberto Vanelli (director), 

Dr. Gianbeppe Colombano, architect 

Francesco Bosso, architect Giovanni Tironi 

www.lavenaria.it 

Ifrane 

The small town in the Middle Atlas 

mountains of Morocco is a popular 

skiing resort and holiday destination. 

Established in 1973 as a luxury 

establishment, the Michlifen hotel 

has now been extended and fully 

redesigned – including a dramatic 

lighting concept for indoor and 

outdoor areas using ERCO’s lighting 

tools. 

Michlifen hotel, Ifrane 

Architect: Axe International, Casablanca 

Lighting designer: Oscar Nystrom, 

Bromma/Saint-Tropez 

www.michlifenifrane.com 

Berlin 

In the cheeky vernacular of Berliners, 

the Victoria statue topping the 

Victory Column in Berlin since 1873 

is nicknamed “Goldelse”, meaning 

something like “Golden Lizzy”. The 

column was restored in 2011 and 

given a fresh and modern appearance 

at night: the relief-adorned 

base of the statue is uniformly illuminated 

by efficient and durable 

Tesis LED wallwashers. 

Victory Column, Berlin 

Project management: Denkmalamt 

Berlin (State Office for Historical Monuments) 

London 

About to marry a prince and need 

appropriate invitation cards? Welcome 

to this printing and stationery 

shop with its rich tradition. It 

prides itself in being a supplier to 

the Royal family. But even ordinary 

customers feel equally comfortable 

in the freshly renovated premises: 

Quintessence recessed luminaires 

ensure excellent visual comfort 

while Optec spotlights appropriately 

accentuate the products. 

Mount Street Printers, London 

www.mountstreetprinters.com 

Eltville 

Embedded in the vine hills of the 

Rheingau, this ancient monastery 

is known as a state-owned winery 

– but also as the location for such 

film classics as “The Name of the 

Rose” or an atmospheric setting 

for concerts. ERCO’s outdoor 

lumi naires accentuate the scenic 

atmosphere at night and ensure 

reliable orientation without glare. 

Kloster Eberbach, Eltville 

Architect: Rimpl + Flacht Architekten, 

Wiesbaden 

Lighting designer: Bamberger engineering 

firm, Pfünz 

www.kloster-eberbach.de 

Graz 

The Kastner & Öhler department 

store is truly a venerable establishment, 

which has been in Graz since 

1883. All the greater was the furore 

over the modern renovation of 

the headquarters – and the appropriately 

promoted lighting concept, 

which largely uses Optec spotlights 

for metal halide lamps. 

Kastner & Öhler fashion house, Graz 

Architect: Nieto Sobejano Arquitectos, 

Madrid; Rolf Seifert, Graz 

Lighting designer: Vedder Lichtmanagement, 

Munich/Mitterberg 

www.kastner-oehler.at 

Utrecht 

Dutch sculptor Ruud Kuijer has 

received multiple awards for his 

“Waterwerken” project. The work of 

art involves a number of abstract 

concrete sculptures with multifaceted 

references to the subject of 

water set up on a spit of land at the 

Amsterdam-Rhine Canal in Utrecht. 

For dramatic effect at night, the 

works are illuminated using efficient 

and durable Powercast LED 

projectors. 

Waterwerken, sculptures by Ruud Kuijer, 

Isotopenweg, Utrecht 

www.ruudkuijer.nl 

Cascais 

The Lacoste shop in the Portuguese 

seaside resort of Cascais represents 

the latest state-of-the-art in shop 

design of the famous sportswear 

brand with the little crocodile. 

The designers opted for a mix of 

Quintessence LED downlights for 

ambient lighting, HIT directional 

luminaires to accentuate the 

products, and Cantax spotlights 

with metal halide lamps in the 

shop windows. White surfaces are 

a dominant feature while RGB cove 

lighting adds colourful accents – 

in harmony with the clear, bright 

colours of the collection. 

Lacoste Boutique, Cascais 

Project manager: Joana Mouta, Lacoste/ 

Devanlay Portugal 

Interior designer: Luis Duarte, Space 

Inverters, Lisbon 

www.lacoste.com 

Stuttgart 

New look for the Court of Honour 

of Stuttgart’s Alte Staatsgalerie 

(Old State Gallery): Tesis in-ground 

wallwashers for metal halide lamps 

now efficiently bathe the neoclassical 

façade in uniform lighting. 

The rider statue of King William I 

of Württemberg is accentuated 

against this background using Tesis 

directional luminaires. 

Court of Honour of the Alte Staatsgalerie, 

Stuttgart 

Architecture and lighting design: 

Christoph Anstett, cda architekt, Stuttgart 

Landscape planning: Köber Landschaftsarchitektur, 

Stuttgart 

www.staatsgalerie.de 

The gold brocade of the 

wall covering is illuminated 

by warm grazing 

light. This sunlight effect 

is artificially produced 

by Powercast projectors 

with metal halide lamps 

mounted outside in the 

air well. 

Casablanca 

As the first art auction house 

in the country, the CMOOA has 

looked after Morocco’s growing 

art market since 2002. To do so 

more efficiently, the company has 

moved into a new building. Featuring 

state-of-the-art technology 

and ERCO gallery lighting, the auction 

lots are now presented in line 

with international standards. 

Compagnie Marocaine des Œuvres et 

Objets d'Art, Casablanca 

Architecture and lighting design: 

Cabinet d'architecture et design Wael 

Elmir, Rabat 

www.cmooa.com 

Rome 

The baroque Palazzo Barberini 

houses the eminent Museum Galleria 

Nazionale d'Arte Antica. Following 

renovations in July 2011, it 

is once again fully accessible to the 

public. This room with a fresco by 

Pietro da Cortona is a true architectural 

gem. 

Palazzo Barberini, Rome 

Architect: Carlo Maderno (~1556–1629), 

Francesco Borromini (1599–1667), 

Gian Lorenzo Bernini (1598–1680) 

Lighting designer: Adriano Caputo, 

Studio illumina, Rome 

www.galleriaborghese.it 


Bright prospects LED – awesome! Frans Hals Museum, Haarlem 

Director: Karel Schampers 

www.franshalsmuseum.nl 


Photo: Thomas Mayer, Neuss 

Featured in the photo (from left to right): 

Ferdinand van Dam (OTH Architecten B.V.), 

Carlo von Meijenfeldt (ERCO), Marijke van der 

Wijst (Van Der Wijst Interieurarchitecten BNI), 

Julian Wolse (OTH Architecten B.V.) 


LED conquers the fashion world: Benetton megastores, Vienna 

The new megastore of the Italian fashion 

brand United Colors of Benetton in Vienna 

is presenting itself in an aesthetically and 

technically innovative fashion – illuminated 

exclusively by ERCO LED lighting tools. 

A store design with the air of liberation, transparency 

and authenticity, both simple and complex: 

Italian fashion brand Benetton now debuts 

with not one but two megastores in Vienna 

run by brothers Marc and Tino Wieser through 

their MTM Textilhandel GmbH. Acting with the 

confidence of successful trading partners – the 

megastore on Mariahilfer Straße is, after all, the 

largest Benetton store in Europe – they enlisted 

the help of a creative team of architects and 

designers to develop a vision for the Benetton 

experience at the point of sale. Without cultivating 

a rustic eco look, sustainability is more 

than just a buzzword: a reduced deployment, 

not only of materials, but even more so, of 

energy for aspects such as the lighting based 

on ERCO LED technology, is a clear recognition 

of future requirements. Just as important in 

the sustainability concept, however, is responsible 

consideration of urban design issues. The 

striking corner building of the megastore on 

Kärntner Straße was given discreet, yet effec 

tive lighting to illuminate its magnificent historic 

façade, while accent lighting emphasises 

the structure and dimensions of the building’s 

fabric – with minimal energy requirements and 

no light pollution thanks to the LED technology 

of ERCO’s Grasshopper projectors. As precision 

lighting tools, Grasshopper LED projectors feature 

Spherolit lenses with diverse light distribution 

patterns from spot to wide and oval flood 

so as to match the task at hand perfectly. 

Both stores present a uniform appearance. 

Entrance and shop windows seamlessly lead 

from the exterior to the interior. Here, too, focus 


was given to maximum transparency and flowing 

transitions. Fixtures, partition walls and 

suspended ceilings made room for a generous 

space continuum. “The buyer stands in the 

shop window, the city exudes all the way into 

the shop,” architect Michael Rieper describes 

the design approach. “Store decorations are 

reduced to illuminated mannequins, variety is 

created through the merchandise.” The shop is 

designed effectively around the merchandise, 

which is presented at, in and on displays that 

seem neutral without appearing trivial: filigree 

shelf structures made of black, bare steel 

tubes look as if drawn into the room, with the 

aesthetics of a CAD wireframe rendering – contrasting 

the compact furniture that gains in 

stylish sophistication through the interplay of 

cubic volumes and recesses. This aspect bears 

the mark of another member of the creative 

team – that of Italian haute couture fashion 

and interior designer Vincenzo De Cotiis. 

Warm, direct lighting accentuates the 

seemingly unfinished surfaces of the interior 

– and effectively sets apart the textiles whose 

“United Colors of Benetton” demand the highest 

standards of lighting quality, specifically in 

terms of colour rendering. These standards are 

more than met by ERCO’s LED lighting tools: 

“The old lighting situation with metal halide 

lamps was highly unsatisfactory,” Rieper criticises 

in hindsight. “2100 light points made up 

what was a uniform concept without effective 

accent lighting – based on a connected load 

of around 140kW,“ the architect says. Now, as 

little as around 50kW are enough for qualitatively 

superior lighting that is orientated 

around human perception, ensuring more flexibility 

and producing less wasted heat, which, 

in turn, guarantees savings in air conditioning 

and ventilation as well as visitor and staff 

comfort. 

Both Benetton megastore locations in 

Vienna, on Kärntner Straße and on Mariahilfer 

Straße, confronted the designers with the usual 

challenges related to existing buildings: windows, 

columns, technical installations that 

limited their freedom of scope. Using Logotec 

LED spotlights, 3circuit tracks, and LED recessed 

spotlights, directional luminaires and downlights 

from its Quintessence range, ERCO was 

able to offer a comprehensive and flexible solution. 

A lighting concept that dispenses with 

fixed grid positions, and instead focuses on the 

furnishing and wall surfaces, left enough scope 

to react efficiently to onsite surprises. The final 

decision for ERCO was made only after extensive 

sample demonstrations with real life conditions. 

Efficiency, light quality and the compact 

shape of the Logotec LED spotlights with inter 

changeable Spherolit lenses for quick and easy 

modification of the light distribution pattern 

tipped the scales in ERCO’s favour – along with 

the convincing service quality of ERCO’s team of 

lighting consultants in Vienna. 

Architecture: 

Marc & Tino Wieser, MTM Textilhandel GmbH, Vienna 

MVD Austria, frank, rieper architekten, Vienna/Graz 

Interior & CI designer: Vincenzo De Cotiis, Milan 

Photos: Rudi Meisel, Berlin 

www.benetton.at 

Entrance area and 

Level 2, Kärntner Straße 

Suspended Hitrac 

structures accommodate 

the Logotec LED spotlights 

that illuminate 

the ground floor. The 

significant ceiling height 

requires spotlight characteristics 

from flood to 

narrow spot to ensure 

optimum emphasis of 

the merchandise. Integrated 

LED strips in the 

Hitrac profile brighten 

the exposed brick ceiling. 

The same concept of 

accent lighting on the 

colourful textiles using 

Logotec LED is used in 

the children’s department 

on Level 2, supplemented 

by Quintessence 

LED downlights and 

directional luminaires as 

ceilingintegrated components. 



Kärntner Straße, 

shop window 

The shop windows of 

the megastores are left 

without back walls as 

separation from the shop 

floor – giving customers 

the experience of flowing 

transitions between 

the different zones. Here, 

the designers opted for 

Logotec LED spotlights 

with narrow spot to flood 

characteristics as lighting. 

Precise beams with virtually 

no spill light produce 

strong contrasts with marginal 

reflections on the 

pane for maximum effect 

of the window display 

even in broad daylight. 


basement level 

The men’s department on 

the basement level highlights 

a further aspect 

of the lighting concept: 

the free arrangement of 

tracks and recessed luminaires 

orientated not on 

an orthogonal grid, but 

rather, on the merchandise 

shelves. Again, the 

merchandise is accentuated 

by Logotec LED 

spotlights, while ambient 

lighting could be kept to 

a minimum thanks to the 

bright surface of floor, 

walls and ceiling. 

Mariahilfer Straße, 

escalators 

A generous void connects 

all three levels of 

this store. Quintessence 

LED recessed spotlights 

in narrow spot bridge 

the enormous distance 

with an output of just 9W 

per luminaire. The levels 

themselves are illuminated 

by Quintessence 

LED downlights and 

directional luminaires 

with glarefree darklight 

reflectors to ensure an 

inconspicuous ceiling 

appearance. 


shelf lighting 

A recurring element 

in the megastores are 

shelving systems along 

the walls. Lighting here 

is provided by a combination 

of several components: 

Quintessence 

LED recessed luminaires 

with flood characteristic 

and an exceptionally 

wide angle of tilt of 40° 

provide basic lighting. 

Logotec LED spotlights 

on a continuous 3circuit 

track add precise accent 

lighting for the merchandise. 


upper level 

“United Colors”: The 

variety of colours of the 

textiles consistently forms 

the focal point of presentations 

at Benetton. Highquality 

colour rendering 

is a vital criterion for the 

lighting – ERCO’s latest 

lighting tools with warm 

white LEDs have a colour 

rendering index in excess 

of R a 90. 

LED ww 

100 % 

80 

60 

40 

20 

0 

300 

ww 

400 500 600 700 

800 nm 


façade 

In order to light the 

amply structured historic 

façade, the designers 

opted for Grasshopper 

LED projectors. Depending 

on whether the grazing 

light was to reach across 

one or two levels, the 

projectors were fitted 

with 14W and 21W modules, 

respectively. Along 

with the lighting effect, 

priority was given to 

glare control for users of 

the upper levels. 


The LED: more than a new type of lamp 

We are slowly beginning to realise just 

how profoundly the LED will change the 

luminaire industry. Armin Scharf talks to 

experts at ERCO. 

Armin Scharf: 

The whole light scene, it seems, is mesmerised 

by the LED. But how much of a breakthrough 

is this technology in actual fact? 

David Kuntzsch: 

The LED is indeed a much talked about subject, 

it seems nothing else exists any more. 

When it comes to actual planning, however, 

things are a little more complex. It’s true that 

the LED is gaining ground, but conventional 

lamps continue to play a big role. From 

ERCO’s viewpoint we can clearly say in terms 

of market penetration that the LED is now 

measuring up to traditional lamps and ranks 

well in terms of economy. 

Andreas Blaut: 

Working in development, I can only confirm 

this. The LED has broken away from earlier 

reservations and it’s the only technology we 

use now. The LED is also a dominant topic 

whenever we talk to other market players or 

suppliers. 

Armin Scharf: 

And what is the situation in design? 

Henk Kosche: 

The same. As far as I can see, the LED has 

established itself firmly over the last five 

years. All our current projects are centred on 

this technology and the LED is a common 

occurrence in our daily work. 

Markus Görres: 

Issues around LED technology have defined 

our day-to-day business for quite a few 

years now, and not only in terms of operative 

aspects. The LED, after all, also requires 

new skills if these issues are to be resolved 

comprehensively and in the interest of our 

customers. 

Armin Scharf: 

This means ERCO has already made the shift 

to LEDs? 



We are definitely past the initial stages, since 

we have built up quite a good level of new 

know-how across all our departments and 

successfully implemented a number of major 

projects involving LED light. Having said 

that, we still have a long way to go. Looking 

at the forecasts, we can expect huge market 

potential here, especially in such sectors as 

museums, retail or outdoor lighting. These 

are precisely the areas where we already hold 

a strong position. 


In terms of conception, development and 

design, we are talking about big changes 

here. LED deliveries are already on a par with 

traditional lamps. The HIT lamp, of course, 

still has particular significance for retail 

applications, especially where very large 

lumen packages need to be made available 

at a comparatively reasonable price. 

Armin Scharf: 

What are these new skills that are required 

for LEDs, what specifically has changed at 

ERCO? 


Where do we start? Initially, we found ourselves 

having to design LED PCBs, develop 

entirely new optical systems, and devise 

electronics to control these LEDs. Using LEDs 

also means we need to procure them first, 

and you need experts here who can com- 

On 2 February 2012, 

author Armin Scharf 

met with a group of 

ERCO experts in Lüdenscheid 

to talk about the 

state of LED technology. 

From left to right: Armin 

Scharf, Henk Kosche 

(Design), David Kuntzsch 

(Marketing), Andreas 

Blaut (Development), Dr. 

Markus Görres (Lighting 

Technology). 

municate with the suppliers. Incoming QC 

processes, in turn, need to assess the quality 

of the LEDs. In this way, LEDs have brought 

a wave of change to every sector of our company. 


ERCO provides a global infrastructure of 

lighting consultants who not only sell a project, 

but help the customer implement their 

conceptual design. In order to maintain the 

quality of our consulting services, our staff 

in this sector needed intensive familiarisation 

with the material in a very short space of 

time. This proved to be an enormous challenge. 

Armin Scharf: 

Has this, as it were, developed into some sort 

of LED culture at ERCO? 

Henk Kosche: 

Yes, absolutely. The LED has brought with it 

a continual process of change, we deal with 

the new challenges facing us very openly, 

critically analysing and scrutinising each as 

they arise. Exactly what you should do with 

new technologies. 


LED culture for us means that things change 

for ERCO, but not, if at all possible, for 

the customer and their processes. The applications 

and approaches of our component 

system acquired over many years remain 

identical. The light intensity distributions 

are exactly the same, only the lamp has 

changed. It means we demonstrate a high 

level of innovation while remaining reliable 

and predictable to the outside. 

Armin Scharf: 

Is this a contribution to planning certainty 

in times of change? 


Exactly. Designers who need to ensure greater 

energy efficiency for a concept based on lowvoltage 

halogen lamps can do so quite easily. 

We offer a solution with the same characteristics, 

but based on LED technology. 

Armin Scharf: 

LED technology is developing at a very fast 

pace; when is the right time from a customer 

point of view to join the movement? 


The demand for LED solutions is already very 

significant, as you know. It means the current 

technical and economic advantages are 

perceived to be highly positive to the point 

that people want to capitalise on them right 

away. This is true even though people know 

that later investments will have even greater 

advantages. Even now, we are already talking 

above-average energy cost savings of 60 to 

80 per cent. With savings on such a scale, it 

makes perfect sense to switch to LED solutions 

right away, rather than waiting initially 

for maybe another 5 per cent or so in terms 

of efficiency. 

Armin Scharf: 

In which segments in particular is the LED 

much in use? 


Based on the projects already supplied, we 

find the deployment in museums and galleries 

using LEDs is disproportionately large. At 

the same time, it’s the market segment with 

the highest standards in terms of lighting 

quality that is most active in adapting to this 

new technology. This is hardly surprising in 

light of the LED characteristics. The National 

Gallery in London employed their own team 

of experts to measure the quality of light 

in their laboratories for many months, before 

deciding on an LED solution in late 2010. 

Ever since we started offering luminaires 

with LEDs producing even higher luminous 

flux, other market segments also started to 

show interest. Last year, for instance, we 

were able to execute quite a number of challenging 

retail projects, some opting exclusively 

for the LED. 

Armin Scharf: 

The fact that especially museums are leading 

the way here is remarkable. Are they not the 

ones that complained the loudest about the 

disappearance of the light bulb? 


The loss of conventional incandescent sources 

has been dramatised so much because alternative 

light sources such as the fluorescent 

lamp weren’t able to provide adequate colour 

rendering or brilliance. The LED now has 

assumed that position, with even better characteristics. 


Looking at the technical characteristics of 

the LED, i.e. energy savings, no IR or UV 

component in the light, the LED is indeed 

ideal for the illumination of art. 

Henk Kosche: 

Thanks to our own optoelectronic systems, 

our 20W LED spotlights today are as efficient 

as 100W low-voltage halogen spots. With 

accent lighting playing such a crucial role 

especially in museums, the gain in efficiency 

is significant. 


And the colour temperature of the LED 

doesn’t change when dimmed. That’s important 

for a museum, where the items displayed 

in an exhibition are to be presented with 

the same level of illuminance. Differences 

in distance between luminaires and exhibits 

means the light needs to be dimmed, which, 

when using halogen lamps, results in an 

unwanted shift in the colour temperature. 

Armin Scharf: 

With the LED, the luminaire sector is 

adopting the same short cycles as the semiconductor 

industry. Is speed a priority here 

for ERCO, i.e. being the first to launch LEDs 

in a product sector, or is reliability more 

important, meaning that products from 

the start are technically sophisticated and 

mature? 

Henk Kosche: 

We have been dealing with this technology 

quite intensively for over ten years now and 

have always looked closely to analyse the suitability 

of the source for various appli cations. 

We started with orientation luminaires back 

in 2000, before turning to LED outdoor luminaires. 

Today, we cover the whole spectrum of 

architectural lighting. We always want to provide 

our customers with the best possible light 

quality; the technology must follow suit. 


The trickiest bit about new technologies is 

facilitating the transition. In other words, we 

wanted to continue providing our customers 

with sophisticated solutions which actually 

meet their requirements and not merely illustrate 

technical feasibility. 

Armin Scharf: 

How does ERCO define the light quality of 

LEDs? 


Light quality has different meanings for 

different people especially when talking 

about LEDs. There are the objective, measurable 

light qualities, such as colour temperature 

or colour rendering. For us, these are 

– in overstated terms – hygiene factors. As a 

technology-driven company, it goes without 

saying that we use chips guaranteeing the 

highest colour rendering and a defined colour 

temperature. For many market players 

that’s all there is to light quality; for us it’s 

actually just the beginning. 

For us, light quality also means thinking 

from the target surface. Vertical illuminance, 

for instance, is all about uniform wall illumination 

using an asymmetrical light distribution. 

We need, therefore, to come up with a 

lighting technology that reproduces exactly 

what our customers have been accustomed 

to for many decades. Ultimately, we provide 

our customers with light, not luminaires. 

That’s actually ERCO’s credo. 


Armin Scharf: 

Integrated Spherolit lens technology is one 

particular aspect that makes ERCO stand out 

from the rest. What are the advantages here 

for the designer, the user? 


We combine a primary lens directly on the 

LED with interchangeable collimators and 

Spherolit lenses, meaning we provide a modular 

optical structure. If the parameters of 

a lighting solution change, it is quite easy to 

exchange these light-guiding components 

to produce a different light distribution. This 

has phenomenal advantages in practice and 

makes for great planning certainty. 


On top of that, we only need to communicate 

one principle, the customer only needs 

to understand one principle. With it, they get 

a number of advantages on the side: less spill 

light, better beam quality. They can consistently 

combine luminaires irrespective of their 

application. 

Armin Scharf: 

There are competitors who follow a different 

modularity principle in that they combine 

purchased standard elements. Is this not an 

option for ERCO? 


No, because firstly, it limits the flexibility, 

as purchased modules are hard, if at all, to 

change. We, on the other hand, are able to 

react to the frequent changes to LED chips 

and provide our customers more or less 

promptly with the best possible light quality. 


In addition to the issues of quality, which 

would have been impossible to resolve with 

off-the-shelf modules, our customers also 

demand differentiated, better solutions 

for their specific projects. ERCO ultimately 

also stands for developing and producing 


its own approaches to lighting technology. 

Put simply, we believe this is the only way to 

assure the quality which the customer rightly 

expects of us. 


Customers don’t want us just to deliver a 

downlight, they want the whole spectrum of 

applications, from narrow beam accent lighting 

to uniform wallwashing. This would not 

be possible with standard modules. 

Henk Kosche: 

We noticed early on that the advantages of 

LED technology can only be realised when 

you have a coherent overall system. The LED’s 

efficiency and longevity is only achievable 

with superb thermal management. The same 

can be said for the role of electronic management 

in the overall system. We simply 

had no choice other than to deal with each 

of these elements individually and optimise 

them as a system. 

Armin Scharf: 

How is this reflected in the overall efficiency? 


Generally, the designer looks at the quantity 

of light generated and the energy required 

for it, i.e. the ratio of lumens to watts. In our 

opinion, this falls a bit short though. Lumens, 

after all, only quantify the luminous flux 

generated by the lamp. We are interested, 

however, in how much light arrives on the 

target surface. Yet generated light can be 

lost in the housing or stray somewhere on 

the wall as spill light. Comparing our products 

with those of our competitors, we often 

register 50% to 100% more illuminance on 

the target surface using the same amount of 

energy. 

Armin Scharf: 

The LED luminaire market seems rather confusing. 

Will this change? 


I reckon it will likely become even more confusing 

in the medium term. The established 

luminaire manufacturers are making efforts 

to reduce the level of complexity in order to 

make life as easy as possible for their customers. 

At the same time, there are companies 

that bring with them electronics and LED 

competence from other sectors, which is not 

really conducive to clarity. It is entirely possible 

that a time may come when customer 

requirements again become a priority and 

the market consolidates. 


It is quite possible that the market and its 

make-up will change because of new suppliers. 

These include companies with strong 

brands, e.g. from the consumer electronics 

sector. Conversely, established companies 

could lose their previous relevance as they fail 

to find adequate answers to new questions 

brought in by designers. 

Armin Scharf: 

What is the significance of varychrome technology 

which adds a white LED to the RGB 

system? 


Behind what is known as RGBW technology 

lies the vision that an ideal luminaire that 

can produce saturated colours as well as 

pastel-type whites and various colour temperatures. 


RGB alone isn’t able to achieve a continuous 

colour spectrum or good colour rendering; 

RGB systems are actually suited only for pure 

colour applications. If illumination in white 

is required along with it, you will need an 

additional white LED. The RGBW system provides 

entirely new possibilities especially in 

terms of colour rendition quality. 


Mixing different colours in a single beam is 

a challenge because, optically, the different 

coloured LEDs are not in the same focus. 

You would normally get shadows behind an 

object with undesirable coloured edges to 

the beam. We have approached this problem 

with our own solution where the complete 

colour mixing occurs as the light is emitted 

from the luminaire. 

Armin Scharf: 

Let’s talk about heat management for a 

moment. Here, too, ERCO is very proud of its 

smart solutions. 


Let’s put it this way: “We are no fans of the 

fan”. 


LEDs emit light into the forward hemisphere, 

but the heat is delivered to the rear hemi- 

sphere. Good thermal coupling of the chip 

surfaces or the PCB makes for ideal heat dissipation. 

This is what we try to ensure from 

the start with high-end thermal simulation. 

Unlike our competitors, we only use passive 

cooling without active components, such as 

ventilators or membranes. These, after all, 

reduce the efficiency of the luminaire as well 

as its service life and can cause disturbing 

noises. 

Armin Scharf: 

What possibilities does the LED offer in 

terms of luminaire design? 

Henk Kosche: 

Freedom in design arises from the restrictions 

which come with a technology. As an 

overall system, the LED is, after all, not a lowcomplexity 

technology. Appropriate design, 

therefore, is based on mastering complexity. 

The product should be as easy to use as possible 

and be intuitively understood by the user. 

In this field, it was quite a challenge for us to 

combine familiar with innovative aspects and 

to find the right style for the product. 


The attitude to design which ERCO applies to 

its products could be described as functional 

minimalism. Looking at the luminaires here 

in front of us, you can see that the transition 

to new shapes has already taken place. The 

LED light heads are now completely flat. In 

that sense, the LED has indeed produced its 

own product language. 


The advantage of our strategy is just as obvious 

in the design. Purchased modules would 

have left us with the old principles: lamp plus 

reflector – and so, with a structure that is no 

different at all from conventional solutions. 

The depth reduction and the formal freedom 

which we’ve now achieved are based on a 

consistent use of our own components, our 

own optical elements. 

Optoelectronics as a 

core competence: Using 

a modular presentation 

system, Dr. Markus Görres 

demonstrates the principle 

of ERCO’s LED lighting 

technology. The experts’ 

theory: All components of 

the overall LED luminaire 

system must be optimised 

to produce lighting tools 

with superior performance 

and efficiency. 

About the author 

Armin Scharf works and lives as a 

freelance journalist and copywriter in 

Tübingen. His focal subjects include 

industrial design, new technologies and 

building technology aspects. He is also 

a permanent external member of the 

Design Report team and various customer 

magazines, and since 2009 has been running 

his own online magazine, zwomp.de, 

dedicated specifically to the exciting field 

of industrial products design. 

www.bueroscharf.de 

www.zwomp.de 


LED spotlights with RGBW varychrome technology 

The new all-rounders among the lighting tools: ERCO’s new LED 

spotlights with RGBW varychrome technology feature variable 

light colour and brightness, subtle white nuances with excellent 

colour rendition and interchangeable Spherolit lenses for various 

light intensity distributions. 

Varychrome technology with RGB 

colour mixing was a key factor 

in the breakthrough of LEDs in 

architectural lighting. For the first 

time, LED luminaires provided a 

combination of features that could 

not be implemented using conventional 

technology: flexibility 

and variability joined comfort, long 

life and efficiency. Their capacity 

for superb dimming and highly 

saturated light colours make LEDs 

the ideal light source for colour 

mixing luminaires. ERCO now 

presents a new generation of LED 

varychrome spotlights that mark a 

clear advance, especially in terms 

of versatility and light quality, 

arguably the most flexible tools for 

accent lighting and wallwashing 

ever provided. These new developments 

are based on the principle of 

adding white LEDs to the primary 


colours red, green and blue (RGB). 

Addressing these four components 

individually and using a DALIcompatible 

4-channel control gear 

means highly saturated light can 

be produced together with pastel 

hues, but more especially so, it 

provides high-grade white light 

with variable colour temper ature – 

infinitely variable along the Planckian 

locus. The additional warm 

white component (3000K) also 

ensures excellent colour rendition. 

ERCO’s varychrome spotlights now 

combine the RGBW colour mixing 

available in the Quintessence 

range of recessed luminaires since 

2010 with the patented LED optical 

system consisting of collimators 

and Spherolit lenses. As a specific 

feature, the varychrome spots have 

a light mixing layer integrated in 

the primary optical system to pro- 

duce homogeneous beams without 

colour shadows. The Spherolit 

technology provides a wide variety 

of light intensity distributions from 

spot to flood and wide flood all the 

way to oval flood and wallwash. 

Thanks to their LED lens 

systems with Spherolit 

lens technology, the new 

LED varychrome spotlights 

provide the usual wide 

range of light intensity 

distributions from spot 

to wallwash with homogeneous 

beams without 

colour shadows. The 

wallwashers, in particular, 

are ideal for dynamic, 

coloured light to add ever 

new dramatic lighting 

effects to architecture. 

RGBW LED module 

The red, green, blue and 

white LEDs are combined 

to light points on the 

modules of ERCO’s LED 

varychrome spotlights. 

The modules are developed 

and produced by 

ERCO to strict specifications. 

Beams without colour shadows 

The individual colour light sources 

of conventional RGB spotlights, 

recognisable as red, green and blue 

light points on the cover glass, 

often result in the phenomenon 

of corresponding multi-coloured 

perimeters around the shadow 

edges. In the development of its 

new LED varychrome spotlights 

ERCO focused specifically on elimi- 

nating these colour shadows. To 

this end, the colour components 

are homogeneously mixed right 

in the LED optical system with the 

result that the cover glass already 

appears in the mixed light colour 

and the beam illuminates objects 

and surfaces without any colour 

shadows. 

Saturated colour 

In order to produce coloured light, 

the four colour components red, 

green, blue and white are individually 

addressed along the principles 

of additive colour mixing. Mixing 

100% blue and 100% red, for 

instance, produces highly saturated 

light in magenta. In ERCO’s LED 

varychrome spotlights, the colours 

are mixed in the LED optical system 

resulting in a colour that appears 

homogeneous even on the cover 

glass. 

Neutral white (approx. 5000K) 

In addition to the three primary 

colours, the new LED varychrome 

spotlights now also have warm 

white LEDs. This, as a result, allows 

any light colour to be infinitely 

changed to pastel hues, but even 

more so, for whites to be produced 

along the Planckian locus – by adding 

further blue or red components 

to the white light. 

Warm white (approx. 2700K) 

The new LED varychrome spotlights 

allow infinite adjustment of the 

colour temperature in a range from 

2700K to 5500K. The already good 

colour rendering of the warm white 

LED (R a >90) is further optimised by 

adding extra spectral components. 


LED spotlights with RGBW varychrome technology 

Products with RGBW technology 

The new LED varychrome technology 

for spotlights consists of the 

RGBW module, a special LED optical 

system with integrated colour 

mixing layer, a six-fold collimator, 

interchangeable Spherolit lenses, 

and customised DALI control gear. 

It is available in the new Light 

Board and Opton spotlight ranges 

and in the latest generation of 

Cantax spotlights. For ceiling integration, 

ERCO provides Light Board 

as recessed RGBW luminaires. 

RGBW technology now also features 

in LED downlights and LED 

wallwashers in the Quintessence 

range. 

Control of RGBW spotlights 

The lighting control system Light 

System DALI provides two control 

panels for corresponding spotlights 

in its integrated Light Studio 

software – the colour circle, which 

allows selection of any colour, 

and the slider control to regulate 

the whites of a defined colour 

temperature. In accordance with 

the current DALI standards, ERCO’s 

varychrome spotlights with RGBW 

technology only require one DALI 

address despite having four colour 

channels. The proven colour compensation 

technology used in the 

factory ensures a high level of colour 

constancy and precision. 


Cantax varychrome 

RGBW 

Light Board varychrome 

recessed luminaire 

0.8 

0.7 510 

0.6 

0.5 500 

y 

0.4 

0.3 

0.2 

0.1 

490 

527 

530 

Green 

480 

Blue 

White 

555 

575 

0.0 

465 380 

0.0 0.1 0.2 0.3 0.4 

x 

0.5 0.6 0.7 0.8 

Colour space 

Within the coloured area 

of the CIE diagram, the 

Planckian locus traces the 

whites of different colour 

temperatures – from 

bluish cool white to reddish 

warm white. RGBW 

technology produces 

both highly saturated colours 

and variable shades 

of white. 

Red 

600 

622 

780 

Light Board varychrome 

RGBW 

Colour temperature 

Light Clients with the 

varychrome RGBW attribute, 

such as those from 

the new LED varychrome 

spotlight range, allow the 

colour temperature to be 

adjusted continuously 

over a wide range in the 

Light Studio software. 

Alternatively, the familiar 

colour wheel can be used 

to select any light colour. 

Opton varychrome 

RGBW 

Spherolit lens for RGBW 

The new LED varychrome spotlights 

feature a special form of the 

patented Spherolit lens technology 

developed by ERCO. The LED 

modules with their primary lenses 

directly on the LEDs, the collimators 

as secondary lenses to create 

a parallel beam, and the Spherolit 

lenses as tertiary lenses to control 

the light distribution are comple- 

Spectrum and colour rendition 

Due to the properties of the human 

eye, light that appears white to us 

may have a very different spectral 

composition. This results in varying 

renditions of body colours which 

define the colour rendition quality 

in relation to a full-spectrum 

reference light. Because of their 

narrow-band spectrums, pure RGB 

luminaires produce white light 

100 B G R 

80 

60 

40 

20 

0 

% 

300 

RGB LEDs 

The RGB LEDs are ideal for 

mixing highly saturated 

coloured light. However, 

the white light from RGB 

LEDs does not give satisfactory 

colour rendition 

quality, making it less 

suitable for lighting tasks 

where colour is critical. 

400 500 600 700 800 nm 

mented by a further layer: this 

colour mixing layer is positioned 

between LED module and the sixfold 

collimator for totally mixed 

homogeneous colour components 

in the optical system to produce a 

beam without any colour shadows. 

with poor colour rendition characteristics. 

The more uniform spectrum 

of the RGBW luminaires, in 

contrast, enables a highly natural, 

superior colour rendition. 

100 B G R 

80 

60 

40 

20 

0 

% 

300 

RGBW LEDs 

Mixing RGB LEDs with 

warm white LEDs combines 

the advantages 

of both systems: RGBW 

lumi naires produce variable 

shades of white 

along the Planckian curve 

with excellent colour 

rendering, but also coloured 

light in pastel hues 

all the way to the highly 

ww 

400 500 600 700 800 nm 

saturated range. The more 

uniform spectrum results 

in a good colour rendition 

quality. 

The optical components 

of ERCO’s LED varychrome 

spotlight with RGBW 

technology: RGBW LED 

module with primary lens 

(1), light mixing layer 

(2) with diffuser film (3), 

six-fold collimator as 

secondary lens (4), interchangeable 

Spherolit lens 

as tertiary lens (5). 

1 

2 

3 

4 

5 



LED case study: New light for conference rooms 

ERCO has taken to upgrading its own premises 

in a continuous commitment to deploying 

modern and efficient LED lighting. The experience 

gained in the process provides the best 

arguments for offering optimal LED lighting 

solutions to designers and clients. 

The basement level of ERCO’s Technical Centre 

in Lüdenscheid accommodates a number of conference 

rooms that, although designed along 

the same concept, differ primarily in terms of 

size to cater for different usage requirements. All 

rooms have a glass front to the exterior, which 

can be shaded where necessary using motorised 

interior blinds. A suspended acoustic ceiling element 

incorporates recessed luminaires and hides 

installations such as media technology, air conditioning 

and ventilation systems. At the head 

of the room, the ceiling element stops short 

of the wall. The resulting haunches are used to 

keep air outlets, electric screen and tracked spotlights 

out of sight. The lighting concept differentiates 

between ambient lighting components 

in a downlight matrix and lighting at the front 


In the small conference 

rooms, ceiling-integrated 

lighting is provided by 

Quintessence LED downlights, 

whereas the 

larger rooms differentiate 

between downlights 

and wallwashers. Interior 

blinds and projection 

screens can be integrated 

in the light management 

ensured by Light System 

DALI using DALI blind and 

screen actuators: A sim- 

ple touch of the Light 

Changer recalling the 

“Presentation” scene, for 

instance, dims the lighting 

while the screen is 

simultaneously lowered. 

face in the form of spotlights and wallwashers 

on track. 

The dimmable LED technology used in the 

Quintessence downlights and Logotec spotlights 

scores primarily in terms of efficiency 

and light quality, but delivers a further convincing 

argument in that it was easily integrated 

into the lighting control system Light System 

DALI. Intelligent lighting control is crucial for 

efficient visual comfort particularly in multifunctional 

rooms. Thanks to DALI plug and 

play, the LED luminaires are quick and easy to 

incorporate into pre-programmed user requirements, 

which can be readily recalled with a 

touch screen on the Light Changer, not only for 

individual dimming of the various light components, 

but also for automatic activation of the 

projection screen, for instance, for multimedia 

presentations. 

The energy savings potential is again considerable 

here: Compared to the previous 

installation – at the time equipped to conform 

with the prevailing standard using generalpurpose, 

halogen and fluorescent lamps – the 

energy consumption has dropped by around 

75% – in the muted light of a presentation, 

even a data projector of the latest “ECO – low 

energy” generation has a significantly higher 

energy requirement than the new LED lighting. 

Lighting concept 

Connected load per m 2 

(W/m 2 ) 

Comparison of connected 

load (%) 

Comparison of operating 

costs 

CO 2 savings per year 

Corresponds to a reduction 

to 27% 

Old New (LED) 

41.38W/m 2 11.05W/m 2 

100% 27% 

100% 18% 

4.9t 

Logotec LED 

The spotlights and wallwashers 

with Spherolit 

lenses are mounted on 

3-circuit track and via 

DALI dimmers are connected 

in groups with 

the lighting control system. 

The uniform wallwashing 

of the back wall 

creates a larger room 

impression. One spotlight 

is used to create a glarefree 

zone of higher illu- 

minance at the room 

entrance to produce the 

effect of a “welcome 

mat”. 



LED case study: RGBW wallwashing in the representative office 

Light that can be infinitely controlled, not only 

in terms of brightness, but also colour, opens 

up new dimensions for scenic lighting effects 

in rooms. Where variable room lighting of a 

high quality is as important as individual accent 

lights in rich colours, LED varychrome luminaires 

with RGBW technology are the perfect solution 

– they combine red, green and blue LEDs 

with efficient warm white LEDs. Individually 

addressed using DALI-compatible control gear 

units, these luminaires can produce intensive 

light of any colour through additive colour mixing, 

but also shades of white along the Planckian 

locus – from the extremely warm tone of 

a dimmed light bulb all the way to the bright 

and cool white of zenith daylight. Through balanced 

spectral composition of the light, colours 

are rendered beautifully and appear natural. For 

the representative office in ERCO’s Technical 

Centre, designers opted for Quintessence RGBW 

wallwashers with LEDs to ensure uniform wallwashing 

of the room surfaces using light of 

variable hues. A Light System DALI installation 


provides the intuitive interface to operate the 

lighting so that a single touch of the screen 

calls up the right light scene for different times 

of the day, occasions or moods. Appropriate 

graphic control panels also allow for interactive 

manual intervention, for instance, in order to 

correct the colour temperature of a group of 

wallwashers as requested. 

DALI plug and play 

ERCO’s RGBW lighting 

tools can be integrated 

as DALI Light Clients in 

such lighting control 

systems as Light System 

DALI. In compliance with 

the current DALI standard, 

the control gear units 

only require one DALI 

address in spite of having 

four control channels. 

On commissioning, the 

factory-encoded ERCO 

Light Clients are automatically 

recognised by 

Light System DALI to offer 

true “plug and play” connectivity. 

Variable colour temperature 

Light components with 

variable colour temperature 

such as wallwashing 

with RGBW varychrome 

wallwashers open up 

countless possibilities of 

scenographic lighting 

in the room. One such 

option in a specific application 

would be wallwashing 

adjusted to the 

natural light coming in 

Coloured light 

Along with the option of 

infinitely variable colour 

temperature of white 

light, RGBW varychrome 

luminaires also cover 

the whole spectrum of 

coloured light: from pastel 

hues all the way to a 

highly saturated range. 

As a result, they are suitable 

both for high-quality 

white light with good 

colour rendition in day- 

through the large windows 

throughout the 

course of the day: cooler 

room light in the afternoon 

(left), warmer light 

towards dusk (right). 

to-day operation, but 

also for coloured scenic 

lighting in rooms used for 

special occasions, such 

as a reception or a private 

viewing. ERCO’s Light 

Changer offers appropriate 

graphic tools on its 

touch screen for colour 

selection. 


Focus Double focus 

Double-focus downlights in use 

Ceiling-integrated lighting with 

lamps largely concealed from view 

pretty much typifies the maxim of 

“light, not luminaires”. The development 

of the double-focus downlight 

has now taken this approach 

to positive extremes. Whereas the 

higher luminous flux of conventional 

downlights necessitates 

larger luminaire apertures, the 

double-focus downlights stand out 

due to their rather small aperture. 

Their advantage in terms of lighting 

lies in optimised screening of 

the lamp to avoid glare. This aspect 

is relevant particularly in rooms 

with high ceilings such as foyers 

or concert halls. Conventional 

downlights easily cause glare here 

through direct view upon the lamp. 

The regressed position of the lamp 

in the double-focus downlight, in 

contrast, ensures pleasant visual 

comfort. Double-focus downlights 

typically produce a relatively narrow 

beam to achieve appropriate 

lighting effects even in rooms with 

higher ceilings. 

The small light aperture of the 

double-focus downlights also has 

design advantages. Compared to 

conventional downlights and their 

considerably much larger luminaire 

apertures these luminaires take on 

a very discreet effect on the ceiling. 

The latter, as a result, appears 

more homogeneous and inconspicuous. 

Grids with large, bright 

luminaire apertures are perceived 

as disturbing particularly on dark 

ceilings. Double-focus downlights 

therefore can contribute to a 

discreet appearance of the ceiling 

even in rooms of normal height. 


Concert hall application: 

Due to its height, the hall 

requires high luminous 

flux for an attractive lighting 

design. Double-focus 

downlights can produce 

the necessary horizontal 

illuminances while maintaining 

a high level of visual 

comfort. 

Airport terminal application: 

High rooms place 

particular demands on 

visual comfort, as the 

angle increases the view 

into the recessed luminaires. 

Double-focus 

downlights are ideal for 

such applications due to 

their high glare control 

and inconspicuous ceiling 

apertures. 

In contrast to downlights 

(left), double-focus 

downlights (right) have 

a smaller, inconspicuous 

luminaire aperture but 

the same luminous flux to 

produce a more discreet 

impression. The Darklight 

reflector in recessed luminaires 

for conventional 

lamps ensures good visual 

comfort. 

Technology of LED double-focus 

downlights 

Double-focus downlights with 

LED technology are designed differently 

from double-focus downlights 

for conventional lamps, but 

their applications are the same. Traditional 

double-focus downlights 

such as for high-pressure discharge 

lamps comprise an upper elliptical 

reflector and a lower Darklight 

reflector. The lamp located at the 

upper, first focal point of the ellipse 

is reflected to the second focal 

point. Here sits the upper edge of 

the compact Darklight reflector, 

which reduces glare and achieves 

excellent visual comfort in the 

room. Detrimental points here are 

their large size along with relatively 

poor efficiency. 

Since PCBs with several LEDs 

produce diverse focal points, the 

existing lighting technology cannot 

directly be transferred to LED technology. 

Consequently, the light of 

the Quintessence LED double-focus 

downlights is guided via a compact 

lens system with collimator and 

Spherolit lens. The projected light is 

emitted as a precise beam with little 

spill light immediately from the 

Spherolit lens making a Darklight 

reflector unnecessary. Instead, a 

matt black anti-glare cone ensures 

visual comfort along with an inconspicuous 

ceiling design, especially 

for dark ceilings. This technical 

approach results in a higher light 

output ratio than for conventional 

lamps, a much better unified glare 

rating (UGR), and a smaller size. 

The LED double-focus downlights 

are fitted either with flood or wide 

flood Spherolit lenses for adjustment 

to the room height. 

Thomas Schielke 

Lamp 

Luminous flux 

Luminous efficacy 

Illuminance 

P* 

Corresponds to a reduction to 24% 

The most notable advantage 

of double-focus 

downlights with LED 

technology compared to 

those with conventional 

lamps is reduced energy 

consumption along with 

a smaller size. 

QT12 LED 

90W 20W, warm white 

1800lm 1305lm 

20lm/W 65lm/W 

178lx 199lx 

8.79W/m² 2.10W/m² 

The LED double-focus 

downlights are provided 

with a matt black antiglare 

cone for optimum 

glare protection and an 

inconspicuous ceiling 

especially in dark rooms 

with high ceilings. 


Palazzo Bembo, Venice 

Historical architecture, contemporary art, 

visionary lighting: ERCO LED technology 

proves its fine qualities in Palazzo Bembo 

exhibition halls. 


A glance through the 

window puts each exhibit 

into the context of six 

centuries of European 

cultural history: the loggia 

hall of Palazzo Bembo 

looks out over the Canal 

Grande and the Rialto 

bridge. The Logotec LED 

projectors, equipped with 

warm-white LEDs and 

proprietary Spherolit 

technology lenses, ensure 

a perfect lighting design. 

The minimalistic, neutral 

design of these compact 

projectors adds a subtle, 

yet characteristic ingredient 

to the blend of historical 

architecture and 

contemporary art. 

Exhibition and lighting design: 

Global Art Affairs, Leiden/Venice 

Photos: Thomas Mayer, Neuss 

www.palazzobembo.org 

In the midst of tourist stampedes, Venice, the 

sinking beauty, is well established as a hub for 

contemporary art. Its driving force is the Venice 

Biennale, whose attraction ensures that a number 

of renowned galleries and collections also 

receive a share of the international audience. A 

particular appeal is often created by the venues 

themselves: historical sites like the old Arsenal 

shipyards, where tangible history is contrasted 

with artefacts formed by contemporary minds 

– some unwieldy, strange, inaccessible, and 

awaiting history's judgment. 

The splendid Palazzo Bembo, built in the 

15 th century by the prominent Bembo family 

and located on the Canal Grande, now houses 

another space for such inspiring encounters. 

The house where, in 1470, the scholar and 

later cardinal Pietro Bembo was born, is once 

again a place of art and culture. What was, for 

many years, a vacant space across several of 

the Palazzo’s floors was brought to life again 

by Global Art Affairs, a foundation which has 

organised exhibitions featuring international 

artists for several years, initiated by Dutch artist 

Rene Rietmayer. Together with his curators 

Sarah Gold and Karlyn De Jongh, Rietmayer had 

been searching for a venue for the 54 th Biennale 

exhibition “Personal Structures” featuring 

28 artists from five continents. Having secured 

a long-term commitment to the exhibition 

space, the trio invested many resources and 

countless hours into the rooms’ restoration, 

which had to meet both the requirements of the 

historic register and, in the light of the exhibits’ 

importance, the standards of a museum. The 

For several years, the 

Global Art Affairs foundation 

has organised 

exhibitions featuring 

international artists. In 

Palazzo Bembo, it has 

found a permanent venue 

in Venice, one of the 

most important hubs for 

contemporary art. The 

photo to the left shows 

the following works 

of art: Arnulf Rainer 

(Austria): Head, untitled, 

2010; Cross, untitled, 

undated. Carl Andre 

(USA): Crux 14, 2010. The 

photo to the right shows 

the following works of 

art: Wallpaper by Peter 

Halley (USA): Judgment 

Day, 2011; in the background, 

by Yuko Sakurai 

(Japan): Tsuyama. 

solid walls of the historic Palazzo allowed them 

to get away without installing air conditioning. 

By contrast, a professional and sustainable 

lighting solution was a “must”. The foundation 

ultimately opted for an ERCO track system with 

Logotec LED spotlights and wallwashers. Curator 

Sarah Gold relates her experience with the 

system as follows: “It works perfectly, allows 

the art optimal expression, and is easy and 

convenient to move around when we rearrange 

exhibitions.” Thanks to its efficient LED technology, 

the connected load is only about 20% 

that of a comparable system using low-voltage 

halogen technology. This not only saves power 

and natural resources; it also spares the curator’s 

nerves, seeing how fickle the wiring in old 

Palazzi can be, as Sarah Gold knows: “Here in 

Venice, we have seen vernissages where, at the 

precise moment the light was supposed to come 

on, the master fuse blew instead. That's not 

going to happen here!” 


The treasury of Styria: Museum im Palais, Graz 

The Cultural History Collection in the 

refurbished Palais Herberstein is part of 

the Joanneum Universal Museum: a further 

example of an institute of worldwide 

significance that has opted for ERCO’s 

LED technology in its galleries. Light is 

also used outdoors for highly effective 

architectural lighting. 

Graz, the capital city of Styria, links rich history 

with a creative future as if the one entailed the 

other. How many modern cities have a historic 

centre that the UNESCO has listed as a world 

heritage site, and more so, were chosen by the 

same international cultural organisation as one 

of the ten “UNESCO Cities of Design” worldwide? 

The Joanneum Universal Museum is part 

of this vivid cultural tradition in Graz. Founded 

in 1811 by Archduke Johann as the first ever 

museum in Austria, it encompasses nine sites in 

historic and modern buildings today. Its collection 

includes well over 4.5 million items from 

different areas making it one of the largest of 

its kind in Europe. One such site is the baroque 

Palais Herberstein at Sackstraße 16. Since 1941, 

this important historic building in the old part 

of Graz has housed initially the New Gallery of 

the Joanneum, before extensive refurbishment 

and restoration work was carried out to reopen 

in May 2011 as the “Museum im Palais”, the new 

home of the Cultural History Collection. 

A reopening that meets all the standards of 

a “City of Design”. With effect, the new museum 

blends the authentic presentation of magnificently 

restored baroque-style rooms in the Palais 

with exhibition galleries of a modern design that 

meet all the curatorial requirements. Today’s 

museum extras such as gift shop and restaurant 

are housed in atmospheric indoor and outdoor 

areas on the ground floor. Evidence of the variety 

of roles ERCO’s lighting tools are able to play 

in a context such as this. The Joanneum is yet 

another institute with global reputation that has 

opted for LED technology from ERCO to light its 

galleries. Its ornate baroque stairwell, the courtyard 

and the pillared arcades all feature stunning 

architectural lighting using ERCO products 

to further enhance the attractive appearance of 

this building. 

The oldest part of the Palais hails from the 

16 th century. Today’s façade design with its 

two portals was added in the 18 th century by 

baroque master builder Joseph Hueber 

(1715–1787), who also built an ornate central 

stairwell to weld the three wings into a single 

building: The grand stairwell is lined by pairs 

of putti carrying lanterns and opens upwards 

to an illusionistic ceiling fresco depicting a 

view into Olympus. Like another fresco in the 

vestibule of the exhibition circuit on the 2 nd 

floor, it is attributed to Philipp Carl Laubmann 

(1703–1792). The magic of the lighting here 

lies in light sources that are hidden from the 

observer. ERCO’s DALI-dimmable Trion ceiling 

washlights for T16 54W fluorescent lamps 

were placed on the surrounding plaster cornice. 

Their asymmetrical light distribution illuminates 

the arched ceiling uniformly – to produce 


Eye-catcher on the Sackstraße 

façade in Graz: 

the magnificent baroque 

portal, effectively lit using 

two Tesis in-ground luminaires. 

These adjustable 

uplights are fitted with 

20W metal halide lamps 

and sculpture lenses to 

produce an oval beam. 

Tesis in-ground 

luminaire HIT 

Lighting design: Gerald P. Marko, Graz 

Exhibition design: Dr. Eva Marko, Graz 

Photos: Rudi Meisel, Berlin 

www.museum-joanneum.at/museum_im_palais 

One of the courtyards of 

the Palais is also used as 

a terrace for the “Prato” 

restaurant. Season permitting, 

visitors can dine 

“al fresco” here in a rather 

unique ambience. The 

glare-free Kubus façade 

luminaires lend the building 

a discreet presence 

at nightfall. They are provided 

with efficient 20W 

metal halide lamps and 

mounted in groups of 

two with a beam emitting 

light both up and 

down. 

Kubus façade luminaire 

HIT 

Historic arched ceilings 

form a grand entrance 

into the Museum im 

Palais. The lighting 

technology of the Tesis 

uplights for 35W metal 

halide lamps used here 

has been modified to 

emit an even softer light 

with a wider beam reaching 

far into the ceiling 

centre. 

The circuit starts off in 

the grand baroque staircase. 

It opens upwards 

to a ceiling fresco by 

Philipp Carl Laubmann 

(1703–1792) depicting 

a view into Olympus. It 

is illuminated by Trion 

ceiling washlights for T16 

54W fluorescent lamps, 

which the designers 

spread around the existing 

plaster cornice. The 

uniform washlighting 

gives the fresco a magic 

appearance as if shining 

from within. 


Cultural history with a 

local link: The Graz collection 

presents true gems 

such as the “Styrian Ducal 

Hat” (top right), but also 

historic everyday objects 

and oddities. The system 

design of ERCO’s LED 

lighting provides a lighting 

tool for each exhibit 

that ensures appropriate 

light distribution with the 

option of adjusting the 

level of brightness exactly 


to its curatorial and conservational 

requirements 

using the integrated 

dimmer. 

the effect of a fresco that seems to shine from 

within. 

Following this overwhelming overture, the 

museum circuit continues on a dramatic level. It 

initially takes the visitor through a suite of four 

rooms, an antechamber, and a cabinet room 

with opulent Rococo decor, in order then to present 

the permanent exhibition of the Cultural 

History Collection in plain modern exhibition 

rooms. Based on the overriding theme of ‘status 

symbols’, the artefacts on show here represent 

political power, an aristocratic lifestyle and 

court education, and generally have a close link 

with Styria or Graz. Among the highlights of the 

Museum im Palais are, for example, the Styrian 

Ducal Hat (c. 1400), Frederick III’s Gothic state 

coach (~1450) ~1450) and the only incontestably genu- genu- genu- 

ine transverse flute in the world made by the 

eminent French instrument-maker and flautist 

Jean Hotteterre, in around 1680. 

As the lighting designer of the exhibition, G.P. 

Marko cleverly staged these cultural treasures 

in such a way that capitalises on all the advantages 

offered by the system design of ERCO’s 

LED lighting tools. Depending on the size and 

format of the exhibits, the designer brought 

all available light intensity distributions of the 

Logotec LED spotlights into play, from narrow 

spot to wide flood, oval flood and wallwash. 

The Spherolit lenses, easily interchangeable for 

future requirement, give designers and engineers 

great flexibility in fine-tuning the system, 

while the low proportion of spill light produces 

dramatic contrasts. To ensure the right dosage of 

illuminance, the LED spotlights can be individu- 

ally dimmed without the shift in colour temperature 

known from halogen lamp. The spectral 

composition of the warm white LED light is free 

of infrared and ultraviolet components to allow 

for best possible protection of the irreplaceable 

exhibits. All these aspects add up to provide an 

attractive, highly flexible and safe lighting solution 

with minimum energy requirement and 

heat input – a prime example of translating the 

potential of ERCO’s LED technology successfully 

into efficient visual comfort in museums and 

galleries. 

Logotec LED 

A highlight of the 

exhibition, Emperor 

Frederick III’s Gothic state 

coach (~1450), is given 

appropriate lighting: the 

highly dramatic effect is 

produced by light sources 

concealed in ceiling ducts, 

their optimum position 

and focusing previously 

determined in extensive 

lighting tests. The designers 

used Optec LED spotlights 

9.6W, narrow spot, 

for specific accentuation 

of the magnificently 

carved coats of armour 

on the front sides of the 

coach. 

The Spherolit lenses, 

which are easily replaced 

to provide different light 

distribution patterns, 

make Logotec LED spotlights 

a flexible tool 

for effective exhibition 

lighting. 

Thanks to the LED lighting 

technology with 

collimators and Spherolit 

lenses to control the 

light distribution, ERCO’s 

LED light used in the 

museum solves many 

different lighting tasks: 

from washlighting of an 

installation with oval 

flood characteristic (left) 

all the way to precise 

accent lighting on smaller 

objects using a narrow 

spot characteristic. 


ECE Center Thier-Galerie, Dortmund 

An economic keystone and city landmark: 

the new shopping centre “Thier-Galerie” in 

Dortmund's city centre. LED lighting tools 

by ERCO enhance its striking appearance. 

Dortmund is a textbook example of structural 

transformation. Less than 50 years ago, the 

region’s notorious economic triad of coal, steel 

and beer dominated this Westphalian metropolis, 

the largest breweries of the time quenching 

the thirst of miners and steelworkers. In the 

meantime, the blast furnaces have gone cold, 

some dismantled, sold and shipped to China, 

while brownfields such as the former Phoenix 

steelworks provide ample space for new business 

districts, lakes, and exclusive residential 

real estate. The breweries also had to surrender 

to the decline in German consumers’ appetite 

for beer. As more and more businesses moved 

to the outskirts, enormous spaces became available 

in the city centre. New buildings as well as 

converted pre-war edifices are now utilised by 

the emerging service sector, both for cultural 

and retail purposes. One example of this is the 

Thier brewery site, a prime location between 

the Hiltropwall and the busy shopping street 

Westenhellweg, abandoned by the brewery as 

early as 1996. 


That real estate was discovered and developed 

by Hamburg-based ECE Projektmanagement, a 

leading European specialist in this field. It created 

the Thier-Galerie, a new, attractive shopping 

centre with over 33,000 square metres of 

retail space. The Berlet house’s meticulously 

reconstructed historical façade facing Westenhellweg 

as well as the interior design concept 

of a “house within a house” contribute to the 

centre’s architectural appeal. Especially when it 

comes to projects of this scale, sustainability is 

an important factor to consider. 

With many years of experience, ECE brings a 

vast amount of know-how to the task of energy 

and resource efficiency. This is borne out by the 

fact that heating only accounts for 20 to 30% 

of the centre’s energy consumption while the 

rest is used for ventilation, air conditioning 

and lighting. This puts the focus on the lighting 

concept: According to ECE, it has cut the energy 

consumption in its new centres by an average 

of 20%, simply by installing state-of-the-art 

lighting tools, an approach that fits in perfectly 

Focalflood LED façade 

luminaire 

The grazing light of the 

Focalflood façade luminaires 

brings out the 

surface texture of buildings 

at night. The narrow 

light distribution over the 

whole wall avoids unnecessary 

light pollution. 

The wide light distribution 

in the other direction 

ensures good uniformity 

on the façade and, if 

mounted in a row, allows 

wide luminaire spacing. 

The two mounting brackets 

help with easy adjustment 

to the inclination 

of the luminaire. 

Architect: Kaspar Kraemer Architekten, Cologne 

(façade); ECE Planning Team, Hamburg 

Lighting designer: LDE KOBER, Dortmund 

Photos: Dirk Vogel, Dortmund 

www.thiergalerie.de 

with the ERCO concept of efficient visual comfort. 

Within these parameters, Dortmund-based 

LDE KOBER’s lighting designers sought to create 

an agreeable atmosphere on the inside with a 

mix of daylight and accentuated artificial light - 

ing and to make the building as a whole stand 

out at night by highlighting the façade’s features. 

The top floors of the newly built space 

serve as parking garages and are designed as a 

roof parapet. A casing of warm-coloured perforated 

metal gives elegance and lightness to the 

top section. Shimmering in a golden hue, it is 

accentuated at night by the grazing light from 

Focalflood LED façade luminaires. The building 

has advanced to a landmark with minimal 

energy consumption and need for servicing 

thanks to ERCO LED technology. 

Ordinarily, ECE's responsibility 

as an operator does 

not extend to furnishing 

tenants' shops. However, 

ECE provides them with 

a lighting manual they 

created to help optimise 

energy efficiency. In this 

way, shops such as the 

fashion jewellery boutique 

“39°C” were inspired 

to use ERCO products to 

Tesis Uplights 

The adjustable uplight 

from the Tesis range of 

recessed floor luminaires, 

rated with IP68, lends 

itself to accentuating 

vertical features of a 

façade with its narrow 

beam. Highly efficient 

metal halide lamps are 

used as lighting tools. 

deliver a lighting concept 

that is consistent with 

the idea of efficient visual 

comfort. 

Lightcast 

IP68 rated downlights 

generate a light carpet 

accentuating the entrance 

area. Again, the lighting 

tools are metal halide 

lamps. 

Optec 

The universal range 

of Optec luminaires is 

available for use both 

with conventional lighting 

tools, such as metal 

halide lamps, and with 

LEDs – in both cases 

with a wide selection of 

light distribution characteristics 

from spot to 

wallwash. 


Backlights 

PLDC 2011, Madrid 

In October 2011, the architectural lighting scene 

gathered in Madrid for the Professional Lighting 

Design Convention (PLDC). Contributing to the 

supporting programme, ERCO Spain had organised 

an “Afterwork Event” for the evening of 21 

October 2011 to be held at Studioloft 11:13, one 

of the trendiest venues in Madrid. Many of the 

international lighting experts used this opportunity 

after a full day at the convention for an 

exchange with colleagues in a more informal 

setting effectively illuminated by ERCO, to enjoy 

the refreshments provided or simply to relax 

to the music. Thank you to all our guests and 

the team who have helped make this evening a 

great success! 

www.pld-c.com 

www.rockandloft.com/11.13/ 

Exponatec 2011, Cologne 

International museums, well-known vendors, 

and high-calibre visitors in an ever more eminent 

cultural market met at the Exponatec trade 

show in Cologne from 16 – 18 November 2011. 

Also present were experts of ERCO Leuchten 

GmbH demonstrating LED lighting technology 

as a topic of particular interest to museums. At 

a compact trade fair stand, practical experience 

of LED lighting tools such as the Logotec LED 

spotlights was backed by ERCO consultants with 

application studies from world leading institutions 

including the National Gallery in London, 

where ERCO’s LED technology had led to drastic 

savings in energy and maintenance costs coupled 

with optimal light quality (full report in 

Lichtbericht 92). The resulting technical discussions 

brought to light the significant potential 

of the concept of efficient visual comfort for 

museums and cause us to be optimistic about 

the further development of museum lighting. 

This is an area in which ERCO is already a recognised 

authority. 

www.exponatec.de 

www.erco.com/museum/de 


International lighting 

experts came together 

at the Afterwork Event 

organised by ERCO Spain 

for the PLDC in Madrid 

last October. 

Superior, hands-on LED 

lighting technology from 

ERCO: Spherolit lenses 

which can be replaced 

without tools to control 

light distribution patterns 

are crucial aspects 

particularly for museum 

experts – providing, for 

instance, for flexible lighting 

situations in changing 

exhibitions. The LED lighting 

tools made an equally 

convincing argument in 

terms of long life, efficiency, 

colour rendition, 

and the protection of 

exhibits. 

Dr. Dirk Stahlschmidt takes his leave 

On 27 January 2012, our managing director Dr. 

Dirk Stahlschmidt bid a sad farewell to the company 

to go into retirement. In a small ceremony 

marking 26 successful years at ERCO, he was 

sent out in style. His executive colleagues and 

hundreds of employees had gathered to wish 

the outgoing managing director all the very 

best for this next stage of life. Dr. Stahlschmidt 

began his career at ERCO as a management 

assistant before he was put in charge of domestic 

sales in 1987 followed by his appointment as 

managing director in 1989. He also looks back 

on many years of service in an honorary capacity 

– such as on the advisory board and as chairman 

of the Fachverband Leuchten (Luminaire 

Association), as jointly responsible founder of 

the international Light+Building trade fair, and 

on the board of managing directors of the ZVEI, 

the German Electrical and Electronic Manufacturers' 

Association. 

Richard Reinke (right), 

chairman of the Works 

Council, also acknowledged 

the constructive 

cooperation with the outgoing 

managing director 

with a donation from 

the Works Council to the 

Friends of the Psychological 

Counselling Service 

Lessingstraße, which Dr. 

Stahlschmidt chairs in an 

honorary capacity. 

Thanks to a colleague, 

who was respected and 

appreciated among the 

workforce as a straightforward 

person of integrity: 

managing director 

Tim Henrik Maack paid 

tribute to the work of 

Dr. Stahlschmidt (left). 

Below: Successor Marcus 

Schramm used the opportunity 

to introduce himself 

as the new managing 

director. 

Hundreds of employees 

had gathered in the 

cafeteria of ERCO’s 

Lüdenscheid head office 

to bid farewell to their 

managing director. A meal 

gave opportunity to look 

back on the time with Dr. 

Stahlschmidt. 

Otl Aicher – Gestalter 

A biography by Eva Moser 

2011, Hatje Cantz (German) 

ISBN 978-3-7757-3201-7 

Otl Aicher (1922-1991) is known as a 

visionary designer and pioneer of visual 

communication. His work on ERCO’s 

image has left a deep mark on our company. 

Art historian Eva Moser now presents 

the first comprehensive biography 

of Aicher that delves deeper also into the 

lesser known sides of the designer. After 

meticulous research among members of 

his family, friends and in archives, it gives 

insight into his life especially as a young 

and private person presenting aspects 

that will be new even to Aicher experts. 

Aicher’s connections in politics and culture 

make his biography an exciting piece 

of contemporary German history. 


Chinese National Museum, 

Beijing 

Architect: von Gerkan, Marg und 

Partner (gmp), Hamburg 

Photos: Michael Wolf, Hong Kong 

www.kunstderaufklaerung.de 

www.chnmuseum.cn 

The world’s largest museum opened 

in April 2011 with the exhibition 

“The Art of the Enlightenment”. A 

massive new annex now extends 

the total area of the Chinese 

National Museum to 191,900m 2 . 

The architectural design by gmp 

and the exhibition presented by 

Germany’s three largest museums, 

the Staatliche Museen in Berlin, 

the Staatliche Kunstsammlungen 

E 

in Dresden and the Bayerische 

Staatsgemäldesammlungen in 

Munich, are not the only contributions 

from Germany – ERCO supplied 

thousands of metres of track 

along with thousands of spotlights 

for exhibition lighting – some 

featuring cutting-edge LED technology. 

ERCO GmbH 

Postfach 2460 

58505 Lüdenscheid 

Germany 

Tel.: +49 2351 551 0 

Fax: +49 2351 551 300 

info@erco.com 

www.erco.com

ERCO Lichtbericht 94

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