Questions tagged [dimmer-switch]

Planning, installing and troubleshooting circuits using electrical dimmer switches for controlling the brightness of lighting.

Dimmer switches are electrical devices used to control the power in an electrical circuit, typically used to dim or brighten lighting. Early dimmers used variable resistors to do this, but that causes a lot of heat dissipation within the switch. Modern dimmers use solid state electronics and are a lot more energy-efficient. Recent improvements to the technology allow LED and CFL bulbs to be dimmed effectively.

When to use this tag

Use tag for any question about an electrical circuit that uses a dimmer. The and tags will probably be appropriate as well. For questions about planning a circuit using them, the tag may be useful. Finally, , or specifies the lighting technology.

Related tags

  • — lighting using CFL (Compact Fluorescent Lamp) bulbs.
  • — all about the electrical subsystem in the house.
  • — lighting using halogen (incandescent) bulbs
  • — lighting using LED (Light-Emitting Diode) bulbs.
  • — general tag for questions about lighting.
  • — for planning and installing wiring to carry electrical power.

External resources

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What should I do to increase the dimming range of LED bulbs?

We started doing most of our homes in LED last year. I am a big dimmer fan and would pretty much put a dimmer on any light switch. One thing that I haven't gotten down is the dimming range of the LED vs what I am used to with the incandescent…
DMoore
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What could be causing changes to a smart bulb to affect a regular bulb on the same circuit?

We have a Lutron Caseta dimmer switch which controls a set of four downlights. I tried replacing the bulbs with Hue downlights (knowing full well that these wouldn't play well with the dimmer, except perhaps at maximum brightness), and observed the…
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Why do LED Lights Flicker on Low Dimmer Setting

I just wired up the following schematic and both sets of LED recessed lights will flicker when dimmed below full power. It doesn't matter what the other dimmer is set to (full power, low power, off). The flicker is very quick, it is sporadic and…
Jonah V
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Can someone explain how this makes sense electrically?

The wiring in my house is... odd. Nearly every pair of outlets has one of the outlets connected to a light switch. Sometimes that switch is quite far from the outlet even when there are other closer switches that seem to control nothing at all.…
Joel Croteau
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Can I safely run 595 watts of lights with a 600 watt dimmer switch?

I have 7 85-watt lights (a total of 595 watts) that I want to control using a 600-watt dimmer switch. Is that too close to be safe? What if I remove one of the lights?
user2215732
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How to fit two Lutron dimmer switches into a two-gang box?

In the place I've just bought, two dimmer switches are coexisting badly in a box. I found the switch plate askew, because the two switches are too far apart. It does not seem possible to push the right hand switch and closer to the left hand…
bmargulies
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Can a 14 AWG pigtail be used with a smart switch with a 20 amp breaker?

There are several previous questions that have been asked on this topic but they're all related to receptacles. I'm seeing that it is against code to use 14 AWG on a 20 amp circuit but when it comes to smart switches, manufacturers don't seem to…
jpQuick
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How do I stop a dimmer switch from humming?

I installed a dimmer switch in my washroom and it's making a buzzing noise. The more I increase resistance/rotate the dimmer clockwise, the louder it gets. The humming seems to be coming from the common wire, not from the light fixture, live wire or…
Orun
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Why was this lighting fixture smoking? What do I do about it?

When we moved in 3 years ago, we replaced the 12V MR-16 halogen lamps in two recessed fixtures in our ceiling with matching LED lamps. This evening I smelled electrical burning and wisps of smoke around one of them. Some investigation turned up…
MemoryWrangler
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Dimmer without neutral?

I live in an old but gut renovated apartment. There is a ceiling light fixture (LED based) in the living room. It is controlled by two-way switches. I want to add a dimmer to control the light. The LED power supply (ESS015E-0350-42) can receive a…
max
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Can a 12 gauge wire be clamped onto a light switch using the side screw?

I was simply replacing a existing dimmer switch for my kitchen lights with a newly bought Feit electric smart 3 way dimmer switch. After studying, I have located where the dimmer switch should be replaced, the load side, as written on the…
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Can I dim LED lights when there are two different switches for the same fixture?

I would like to place dimmers in two different rooms that are sometimes a bit over lit. Is that possible when both areas have two switches for the recessed lighting? Do I need to replace both switches with LED dimmer switches?
mauigirl
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Changing Out a "Vintage" Dimmer Switch

First off ---- I am by no means an electrician. That said, I have a dimmer switch that needs to go..and be replaced by a new one. However, upon searching the internet and reading the instructions several times over, I am stuck. The dimmer being…
J Crosby
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Why are my some of my LED lights flickering?

Something is causing some of my LED lights to flicker in three locations. Here are two examples: https://www.youtube.com/watch?v=4J-g2z_YtYM https://www.youtube.com/watch?v=KlbPdvkZ-BU There are a few peculiar aspects. The lights flicker…
Wynne
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Box fill calcs - math vs reality

Working on a project where I am planning a 3-gang switch box. The box will be a plastic carlton super blue (53 in³). My fill-math works out fine, but I'm wondering about the practical reality of such a crowded box. Box will contain: 14/2 inbound…
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