User Manual
Lighting supports selling
Lighting control systems always play an important role when  
it comes to presenting products or rooms in a favorable light.  
A fitting mood can be achieved in rooms and spaces by adjusting
the brightness of individual lamps. To achieve that mood, universal 
dimmers are used that enable appealing adjustment of the lighting 
brightness.
Conventional lamps are giving way to LED lamps
The term “retrofit” – to install something retroactively – suggests  
that LED retrofit lamps are supplanting conventional incandescent 
and halogen lamps. Products of the same standard socket sizes  
(E27 and E14, etc.), similar designs (as bulbs, spotlights and candles)  
and directional characteristic (global, spot, etc.) are available,  
some dimmable and some not.
In addition to LED retrofit lamps with integrated electronics, there  
are LED lamps controlled by an LED driver that serves as an electrical 
ballast device. These LED drivers act as electronic transformers.
Dimming of LED lamps
In general, all conventional incandescent and halogen lamps are dim-
mable. In contrast, LED lamps are equipped with electronic switching 
for control purposes. As no uniform standard is available for these 
electronics, every LED lamp behaves differently. The lamp manufac-
turer defines the brightness range within which an LED lamp can be 
dimmed. Lamp manufacturers mark LED lamps correspondingly in 
their technical datasheets, on the packaging or on the product itself. 
Hence, dimming LEDs is only implementable within the scope of  
possibility set by the LED manufacturer. Because the electronics  
installed in dimmable LED lamps are not standardized, the range  
of dimmabilty can only be guaranteed by testing.
70% 50%50%
70%
AC 230 V
Dimming of LED
1
1
2
Room operator unit, 
e.g. room controller 
UP  Contouch
2
Universal dimmer 
N D




