licht.wissen No. 09 “Refurbishment in Trade, Commerce and Administration“

licht.wissen 09
Refurbishment in Trade, Commerce and Administration
Ballasts in old installations
Please note: Prior to 2005, reactive power compensation
was widely realised by series capacitors in the western
German states. The effect of this “lead-lag circuit” is to
increase connected loads by an average of eight percent.
New LED installations are fitted with electronic operating
devices, which do not require efficiency-reducing p.f.
correction capacitors.
The input power figures in the following application
examples are based on parallel p.f. correction. In the
case of an old installation operating on the basis of
lead-lag circuitry, the figures would therefore be eight
percent higher.
[20 + 21] Good office lighting boosts staff
motivation and creates an agreeable atmosphere.
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Direct luminaire replacement
Recessed louver luminaires with four 18 W lamps (T26)
– which are still found in many offices today – can often
be directly replaced by recessed LED luminaires with a
luminaire luminous flux of 3,700 lumen. Care should be
taken to ensure that the luminaires are appropriate for
VDU workplaces.
Energy requirements are further reduced by presence
detection and daylight-dependent lighting regulation. In a
group office with average incident daylight, for example,
they can make for an energy saving of 55 percent.
Recommended options include lighting management
systems with a DALI interface, as is used for lighting with
fluorescent lamps.
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