Lighting is a critical factor in the success of any indoor growing operation. A common problem with lighting fixtures is that they can emit a buzzing or humming sound. I attended a public school filled with fluorescent lights.

I know these annoying noises. So this post is very close to my heart, and I will explore why this noise occurs and what you can do about it.

Light bulbs are pretty simple, and their simplicity makes them easy to use and inexpensive. But it also means they are sensitive to changes in the environment. A single loose wire or a small carbon deposit can be enough to cause a hum or buzz in your bulbs.

Before I  go any further: a buzzing light bulb is not dangerous, and there are some simple repairs you can do yourself to get your fixture back in working order.

Loose Bulbs Or Dimmer problems

The first thing you should do is check the light bulb itself. If the bulb is loose in the socket, it may not be making contact with both sides of the socket and causing the buzzing.

Try gently rotating the bulb until it makes contact on all sides. This sometimes works best if you turn off the light before, so it is not too hot- to the touch.

If that does not work, check your dimmer switch. Sometimes dimmer switches can cause problems with certain types of light bulbs. If your dimmer switch is an older model and your bulbs are LEDs, it may not be compatible.

Therefore, replace your dimmer and ensure it is compatible with your bulb by reviewing its compatibility sheet.

Bad fixture or Ballast

Have you ever heard a low hum or buzz coming from your lamp? It’s annoying, and sometimes the noise is even accompanied by a flickering light. The good news is that this issue has an easy fix.

The truth is that some light bulbs tend to make noise as they age. Fluorescent bulbs with old ballast can not regulate voltage as they used to. So what can you do? If you are lucky, unscrewing the bulb and replacing it will be enough. If not, you may have to replace the entire ballast. 

If you are still using a ballast with a magnetic core or with a noise class other than Class A, you will probably hear a strong hum. Upgrading to an electric ballast or a ballast with a quiet Class A rating may eliminate this problem.

Electric ballasts are quieter for several reasons. First, they have no moving parts like magnetic ballasts, so there is no vibration and no need for extra padding or insulation around the product. Second, electric ballasts generate less heat and less electromagnetic interference (EMI), both sources of hum and noise.

First, make sure the bulb socket is clean and free of debris. If there are metal shavings or other debris in the socket, they can cause static electricity and make your light bulb buzz. Use a vacuum cleaner nozzle to suck up any loose dirt or metal debris before proceeding.

Insert the bulb and turn on the light. Monitor your fixture for any unusual sounds. If your light is still buzzing then the ballast is the culprit. Bellow is an amazing video that can help you replace your ballast.

EM Interference and Shorts

LEDs are known for being able to be dimmed more smoothly than traditional bulbs, but they still have one of the same problems: humming.

If you notice a hum when the lights are on, it’s probably due to electromagnetic (EM) interference caused by other devices in your home. Unfortunately, if that’s the case, there’s not much you can do.

Furthermore, electric shorts are not something you shout trifle with; if you suspect this problem call a professional immediately.

Carbon build-up on electric contacts can cause your bulb to emit a buzzing sound. Similarly, loose screws within the fixture can cause it to vibrate and produce those annoying noises. Inspect your fixture for any loose screws.

That’s about it. A buzzing light bulb is not dangerous. Many people leave their lights buzzing because they have no idea how to fix them.

I hope this article has helped you. Do not be afraid to replace the bulb or dimmer and if all else fails, call an electrician to pinpoint the noise.