Buzzing Light Bulbs
Light bulbs may begin to buzz just before they’re about to burn out. However, sometimes it’s more than that. Older fixtures that need to be replaced, bad ballasts, aging bulbs and faulty dimmer switches can be the culprit.
Fluorescent Bulbs
Sometimes the ballast — a device that regulates the amount of a circuit’s current — creates enough heat to loosen the brackets, causing the buzzing sound. A fluorescent light ballast keeps the lamp from burning out.
Fixes:
- Remove the cover of the fluorescent bulb. Rotate it a half or a quarter turn. Then return it back into the light housing. You may need to do this for each light bulb to fix the issue.
- Replace the fluorescent bulb with one that’s more modern.
- Replace the ballast. Note that not all bulbs, like halogen, LED and incandescent, need a ballast.
If you’re unsure about what type of ballast you need, read our guide to help you choose the right ballast for compatibility with the light bulb.
LED Bulbs
LED bulbs don’t have filaments. One reason LED bulbs buzz is because of an overload on the circuit resulting in a higher voltage going to the bulb. Typically, the light is using a frequency of 120 hertz. This causes the LED bulb’s components to buzz. Buzzing could also be caused by electromagnetic interference from other instruments like a microwave or toaster oven.
Another cause could be that the dimmer switch is incompatible with the LED bulb. The voltage of the dimmer goes up when the light is dimmed. You should also check the dimmer switch load. Dimmers have a minimum load requirement to prevent the light from flickering, flashing when it’s turned off or not working.
Fixes:
- Try replacing the LED bulb with a different model LED.
- Upgrade the dimmer switch.
Incandescent Bulbs
If you’re still using incandescent bulbs and they’re buzzing, it’s likely the filament vibrating. As with LEDs, the problem may be caused by the dimmer switch.
Fixes:
- Replace the incandescent bulb with an LED bulb.
- Upgrade the dimmer switch. Learn how to install one.
CFL Bulbs
CFL bulbs (compact fluorescent lamps that are also called compact fluorescent lights) are being phased out, however, they’re still in use. If a CFL bulb is buzzing, it’s likely caused by a faulty ballast.
Fixes:
- Replace the CFL bulb.
- Replace the ballast.
Other Reasons a Light Fixture Is Buzzing
In addition to the reasons noted above, there are other reasons your light fixture is buzzing.
- Loose fixture
- Worn insulation
- Frayed wiring
- Loose wiring inside the outlet
- Rusty sockets
More Info
Learn how to change a ceiling light fixture.
Follow these steps to replace a vanity light.
Discover how to install a flush-mount light.
When Is It Time to Call an Electrician?
Some buzzing issues are easily fixed as a DIY (do-it-yourself) project if you have the technical know-how and you’re aware of the necessary safety precautions you need to take when working with electricity.
If the buzzing is caused by an electrical short, don’t attempt to fix it yourself. It’s time to call on a licensed professional. You should also call an electrician if your lights are flickering on and off, or you hear buzzing in the walls.
Let's Get Started
If you have a buzzing light in your home, here are some possible reasons:
- Incompatible or outdated dimmer switches
- Loose parts
- Frayed wiring
- Bad ballasts
- Corroded sockets
- Using the wrong bulb type
Sometimes the fix is a simple solution by switching light bulbs or tightening connections. However, if the buzzing is occurring in the walls or there’s flickering, you’ll need to call a licensed electrician.
For all your lighting and light bulb needs, shop online or visit your local Lowe’s store. If you’re replacing a light fixture, Lowe’s can install it for you.
Frequently Asked Questions
Can a buzzing light fixture be dangerous?
Yes. If your light is buzzing, it could indicate that the circuits are overloaded, there's faulty components or loose wiring. If these issues aren't addressed, it could be a fire hazard.
When should I call an electrician for a buzzing light?
If you notice the following signs, it's time to call an electrician.
- The buzzing is persistent
- The buzzing continues to get louder
- If the buzzing is persistent or gets louder and it's combined with a flickering light, a burning smell or heat.
What type of light bulb is best for quiet operation?
The quietest and most reliable choice would be LED bulbs. Shop Lowe's for a large selection of high-quality LEDs from reputable brands.
Can old fixtures cause buzzing even with new bulbs?
Yes. If you have an aging socket, outdated wiring or a worn ballast, it can still result in a buzzing fixture. If this is the case, you'll probably need to update or replace the fixture.