LEDs flash when turned on

I been having a problem with dimmers and light ,also---some LED dimmers only seem to work with some lights---but not all---

Let's see if anyone have found the best combination.

The output waveform of dimers will
be ir-regular and usually contain a
fair amount of hash.
This can upset some electronic
circuitry ( power supply in led lights ).
So this is an in-compatibility issue.
Try other brands till you find one that
works better.

DiegoJames said:

I installed four LED overhead ceiling "can" lights. Three are grouped on a single switch with an LED approved dimmer and the fourth one is on a separate three way switch, also with LED dimmer and on a different power line. All of them, on both switches hesitate a quick second and then flash once on and off before settling into being turned on. Once on, they perform normally and dim effectively but they always do the flash when starting up unless you turn them off and right back on, then they come on without the flash. I read online that there are many issues with consistency of performance in LEDs and dimmers. I don't like the flash but I can live with it. That is unless this indicates a danger which must be addressed?

Click to expand...

If you remove the dimmers does the problem go away?

When you say approved LED dimmer, does that mean that they are recommended by the lighting manufacturer or just generally approved for LED lights?

If the problem is from the dimmers, contact the lighting manufacturer.

dmxthotheax: In the meantime is this incompatibility dangerous or just not visually pleasant.

John Grabowski: Thanks for two good questions. I will check on the manufacturer's suggested dimmers.

You have to have dimmer-approved LEDs as well as LED-approved dimmers.

Spoke to Lutron support (brand of my LED compatible dimmer) and I researched online HALO (my LED dimmable fixture). My LED ceiling light is already outdated and replaced by an updated model. I bought these fixtures 2 years ago for this project. In the Lutron literature I'm not going to find a dimmer that is specifically listed for this unit because they haven't tested it and won't because it's already outdated. And I could not find documents for compatible dimmers on the HALO website but stating that mine was replaced. I'm going to give HALO a call to see what they say. But Lutron assured me that though the flashing upon turning on is not ideal it is not dangerous which is the most important thing I wanted to find out. If anyone on DIYchatroom disagrees and thinks the flash upon turn-on IS dangerous please post your knowledge.