On Saturday, 1 August 2015 21:03:56 UTC+1, wrote:
Hi,

I have had lighting installed in my flat. Although my fitter is still being helpful he is running out of ideas.

The lighting is all led controlled using rako rdl250c units:

http://www.rakocontrols.com/products...ne-dimmer.html.

The problem I have is that there is noticeable changes in light intensity which becomes very evident when the leds are dimmed. The best way I can describe it is that the leds look like candle flames. I don't think it is a mains frequency flicker.

Now that I look carefully at traditional halogen lamps elsewhere in the flat I can also detect a less pronounced flicker.

My guess at what is happening is that I have an unstable voltage supply. Note that block of flats (7 flats in total) does not have a gas supply so all of the heating and cooking is on the electric supply. The leds react faster that the halogen lamps so that the intensity changes are more evident.

Any advice or ideas appreciated. The total load of led lights is about 150 watts (20 downlighters plus led strips).

Mike

I have now tried 5 replacement led lamps in one of the rooms. Initial results look promising. The flicker is reduced to the extent that it is not noticeable. I will run them for a while before declaring victory. What I have learnt form this thread is that the source of these flicker problems on LEDs is the interaction between the the voltage control done by the dimmer and the separate voltage reduction done by the circuit in the led bulb itself. Often even though a particular set-up works it might be "only just" working. Then some small difference can turn that into "only just" not working :-). I think my future approach would be to choose a well regarded bulb and then check with the manufacturer for the dimmer which they recommend. Thanks again to everyone for your contributions