ERCO Lichtbericht 94

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.
16 ERCO Lichtbericht 94
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
ERCO Lichtbericht 94 17