Can Dimmers Work with LEDs?

Dimmers are popular applications in many homes these days, allowing people the ability to add drama and a touch of romance whenever the mood strikes.

07/13/2017

In some cases, if consumers want to replace their incandescent bulbs with more energy-efficient lighting sources such as compact fluorescents or LEDs, they may find that their existing dimmer controls won’t work.

That’s because current dimmer controls are designed to work with incandescent bulbs, and the technology they use isn’t always compatible with CFLs or LEDs.

Some dimmer controls don't work with LEDsAccording to Kelly Gordon of the Pacific Northwest National Laboratory, normal household dimmers work by turning the power on and off to an incandescent bulb very quickly. Because it happens to fast, most people don’t detect that the light is flickering; instead it just looks light the light has been dimmed.

These dramatic spikes in current are fine for incandescents, but Gordon says CFLs and LEDs both require very specific power levels to operate and often the ballasts and drivers that regulate power to the CFL and LED bulbs aren’t able to withstand the pulsating power.

For example, Gordon says some screw-in CFLs will work with the existing dimmer switches, but often when the lights get down to a 30 percent light level, they’ll simply shut all of the way off instead of gradually dimming to darkness.

The problems are even worse with LEDs because Gordon says some dimmer switches have a minimum load requirement to work, and when those dimmer switches are hooked up to the extremely energy-efficient LEDs, the dimmers won’t work at all. “[Sometimes] they’ll have a 100-watt minimum load that they’ll work on. And LEDs are starting at already way below that, so even if you had a bunch of LED fixtures on it, it still wouldn’t meet the minimum load requirement for the switch, so that’s another challenge,” Gordon explains.

Luckily, CFL manufacturers are now beginning to specify on their packaging whether the bulbs can be used with dimmers. But Gordon says most LED bulb manufacturers haven’t begun to inform consumers about whether or not their light fixtures are compatible with exisiting dimmers.

In fact, Gordon says she’s only aware of one LED manufacturer, Cree LED Lighting Solutions, that specifies which company’s products are compatible with its lights.

“I think, as we see more LED replacement lamps, [or] screw-in lamps, that’s something manufacturers are going to have to do. They’re going to have to give an indication of what kind of dimmer switches their product will work with… They’re going to have to label them as dimmable,” Gordon says.

Over time, as LEDs become more common in residential lighting, Gordon says more LED-compatible dimmer switches will be installed in homes.

“But that’s going to be a long-term thing,” Gordon says. “In the next five years or so there are going to be many of the same issues as with CFLs with dimmer compatibility.”

Leave a Comment

Submitted by Pattani (not verified) on Wed, 09/27/2017 - 21:44

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I just moved to a new home which has many halogen pot lights and many dimmers, installed about 2 years ago. I would like to change the halogen pot lights to LEDs. My main question is, if the existing dimmers are not compatible with LEDs, would there be a danger of damage or injury? (If it is not dangerous, and it is just that it would not work, I can then change the dimmers by installing new dimmers that are LED compatible). Please. Let me know at [email protected] Thank you.

Submitted by VALINDA NEELY (not verified) on Fri, 11/10/2017 - 14:57

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SAME QUESTION, IS A LED BULB COMPATABLE WITH MY DIMMER SWITCH (IF I SWITCH BULBS) to CORRECT THE FLICKERING/OR LOW NO LIGHTING IN THAT FIXTURE

Submitted by Harry Elliot (not verified) on Tue, 11/28/2017 - 04:43

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Surprised many of the reviewed items don’t include lux figures.
Some LEDs are really crappy.
Nothing like having a LED item that looks great and barely illuminates.
https://productriver.com/led-kitchen-lighting-fixtures/