Why do Fluorescent Lights Hum?

Answer

Fluorescent lights hum because fluorescent lights contain gas and mercury. When the gas inside the tube is ionized, the current rises very quickly, but a device called a ballast is used here to limit the current through the tube, thus causing the buzzing noise.
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Why Do Fluorescent Lights Hum?
If you have eliminated vibration noise from loose fittings or metal parts of the fluorescent light fixture, the cause of humming may be ballast harmonics. Two types of ballasts exist with three sound ratings, but all ballasts hum to a degree. Commercial... More »
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