Light fixture makes a buzzing sound

Symptoms

• Audible buzz coming from the fixture itself, not the switch
• Buzz changes with dimmer level if on a dimmer
• Buzz has gotten louder over time

Likely causes

• CommonAn LED bulb-dimmer incompatibilityThis is one of the most common sources of buzzing in modern fixtures.
• CommonA loose part inside the fixture vibratingTrim rings, glass shades, or mounting hardware can rattle and sound like a buzz.
• PossibleAn aging ballast or transformer inside the fixtureFluorescent or low-voltage fixtures with a built-in ballast or transformer can hum as they wear.
• PossibleA loose wire connectionWorth checking if the buzz doesn't change with dimmer level and isn't a loose physical part.

What to do

1. Check if the fixture is on a dimmer and confirm both dimmer and bulbs are LED-compatible.
2. Gently tighten any glass shades, trim rings, or visible hardware on the fixture.
3. Try a different, quality dimmable LED bulb if buzzing persists.
4. Turn off the breaker and check for a loose wire connection if buzzing continues at full brightness with no dimmer.
5. If the fixture has a built-in ballast or transformer, consider its age and whether it's due for replacement.
6. Replace the dimmer with an LED-rated model if that's the identified mismatch.
7. Call an electrician if buzzing continues after addressing bulb, dimmer, and loose parts.

Tools and parts

• Screwdriver

When to call a pro

Call an electrician if buzzing continues after ruling out the bulb, dimmer, and loose parts, especially if paired with warmth or a smell.

Safety