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Smart Home Forum by FIBARO Team

Fibaro Dimmer 2 doesn't dimm all lights equally


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Hi all,


I got 8 led light bulbs in 4 boxes connected in a serie behind a 220v to 12v Transformator. Leds (osram parathom g53) are controlled using a Fibaro dimmer 2 in a 3 wire configuration. When I dim the leds below 25% dim level the led bulbs in the end of the serie turn off or start flickering (red circle). It seems that the first 2 leds in the first box (green circle) are allways at a higher brightness level than the other leds and that some power is "lost along the road"


Any idea's to get all leds at the exact same brightness levels? How can I prevent flickering? 
I already tried the following without mucht help:

1. Auto calibrating with one bulb

2. Using a bypass

3. Testing parameter 38 and 30 


Thanks in advance!


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  • 3 months later...

Could this be due to a voltage drop?

How many meters of wire is it between the transformer, led1, led2, led3 and led4?

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This is definitely due to a voltage drop which depends on the wire length and diameter.

Solution change wires with bigger diameter, make wires shorter, splits circuit in two and add one more trafo for another half, replace LED's and trafo that uses higher voltage, because higher voltage will drop current for the same power and less current less drop on voltage... etc.


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