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Discussion Starter · #1 ·
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?
 

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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.
 

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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.
 

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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?
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.
 

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Discussion Starter · #5 ·
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.
 

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The best resource for compatible LED's and dimmers is Lutron.


This could get you started: http://www.lutron.com/TechnicalDocumentLibrary/3682994a_CFL LED Bulb list_Resi Systems.pdf



Many of the older dimmers will not work well with LED bulbs, while they may work with CFL's and such. But even with CFL's many dimmers will not work in those cases either.


Most likely, the electronics in your bulbs are the problem.

Some of the LED bulbs I have (Feit) that came from Costco, have some odd characteristics even with a simple on/off switch. Turn on and one bulb will light up first, followed a split second later by others on the line. Not necessarily the first bulb in line either.


Thankfully MIT is working on incandescent bulbs that are more efficient than LED's, so maybe, just maybe, there will be a shift back away form these hateful things.
 

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Discussion Starter · #8 ·
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.
 
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