Awasome Buzzing Ceiling Light References. This can cause vibrations which result in the buzz. Web a buzzing sound coming from an incandescent light fixture is most often caused by a defective light socket or a loose bulb.
The best way to find out if the dimmer switch is the reason for the buzzing is to temporarily take the light off of the dimmer switch. Reasons can range from dimmer switches and mismatched bulbs to old light ballasts that need to be replaced. However, the most common reason for buzzing lights isn’t the bulb itself but the voltage being applied to it.
