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—What you are noticing

LED lights that flicker on a dimmer

LED lamps and dimmers have to be matched. When they are not, the result is flicker, buzzing or lights that will not dim smoothly.

Older dimmer switches were designed for incandescent and halogen lamps, which draw much more power and dim simply by reducing voltage. LED lamps contain electronics that respond differently. On an unsuitable dimmer they can flicker at low settings, buzz, refuse to switch fully off, or turn on with a delay.

This guide describes what people notice and what is safe to do. It does not diagnose your installation; only someone who has seen it can.

Getting them to work together usually involves three things: lamps marked as dimmable, a dimmer designed for LED loads, and enough total load on the dimmer to meet its minimum. Some combinations simply do not work well, which is why manufacturers publish compatibility lists. Replacing a dimmer is a job for an electrician, but choosing the right lamps is something an owner can do.

01In short

The points that matter most

  • Lamps must be dimmable

    Non-dimmable LEDs on a dimmer flicker and fail early.

  • Dimmers must suit LED

    Older dimmers were made for much higher loads.

  • Minimum load matters

    Too few LED lamps on a dimmer can fall below its working range.

02Detail

How it is resolved

  • Checking the lamps

    Confirming every lamp on the circuit is dimmable and of the same type.

  • Choosing the dimmer

    Selecting a dimmer suited to LED loads and the number of lamps.

  • Adjusting settings

    Some LED dimmers have minimum-level adjustments that remove low-end flicker.

03Checklist

Before a visit

  • Read the lamp packaging

    Look for "dimmable" and note the brand.

  • Count the lamps

    On each dimmer circuit.

  • Note the symptom

    Flicker, buzz, delay or not dimming fully.

04Questions

Questions people ask

Can I just buy different bulbs?
Sometimes dimmable lamps solve it; often the dimmer needs changing too.
Why does it flicker only at low settings?
Many combinations struggle at the bottom of the range; adjustable dimmers help.
Are mixed lamp brands a problem?
They can behave differently on the same dimmer. Matching them helps.

05Related

Related guides

This guide sits under troubleshooting. All topics are on the guides page.

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Dimmed lights flickering?

Tell us the lamp type, how many there are and the dimmer. We will suggest a combination that works.

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