led dimming problem(dimming up and down by themself)

[Gary Oldroyd]

recently done a job at a house
used the old cable and re routed to control 6 gu10 led dimmable downlights
and run in a new cable from the switch to another 3 downlights

the client wanted it controlled using a 2 gang dimmer when i left everything seemed to be working fine, got a phone call a fewdays later saying that lights were dimming by them self and dimming back up went back changed the dimmer another thought it might be beacause the first dimmer i bought was a cheap screwfix one(said it was capable of dimming gu10 leds) second one was a decent brand cant think for the life off me who though

so after changing that and yet again thinking i solved the problem get another phone call saying its dimming up and down got new phillips lamps instead of cheap ones still no change

what am i missing here???

 

[Octopus]

What happens if you fit a halogen lamp in place of one of the LED's?

 

[The Ghost]

Have you seen this for yourself? Do they go up to full brightness and down again. Sounds like some capacitive effect charging up then discharging through the lamp. Quite often the smallest amount of leakage can leave the dimmers appearing to be on. Perhaps if you put a snubber between the lives?

 

[Lee42]

I have come accross this before a couple of years ago. If i remember rightly it was on a hamilton dimmer. Think i ended up putting a snubber accross the first light fitting, which solved the problem

Or it could of been a dummy load. Cant quite remember now

 

[Reynard]

Hey!
Starting off with the dimming error, it usually occurs due to issues with the power grid. If there is any sort of abnormal activity with your overall power grid it could affect the lighting in your home. To avoid this, try using switch dimmers as they could help in controlling the output of the light much more efficiently compared to standard dimmers. Click here to learn more about switch dimmers...

 

[davesparks]

Hey!
Starting off with the dimming error, it usually occurs due to issues with the power grid. If there is any sort of abnormal activity with your overall power grid it could affect the lighting in your home. To avoid this, try using switch dimmers as they could help in controlling the output of the light much more efficiently compared to standard dimmers. Click here to learn more about switch dimmers...

Nonsense!

 

[SJD]

Just to check you are not using dimmers that can be programmed - by switching off then on again quickly. The VPro dimmer modules do this, which I think are in some dimmers that Screwfix sell. You know they are in programming mode because they dim up & down by themselves (to program min/max levels)! If I install these, I tell the customer about this, so they know what is happening.