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Do fluorescent fixture ballasts hum?

April 26, 2017ballasts fixture fluorescent hum

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Do fluorescent fixture ballasts hum?

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All ballasts hum to some minor degree. Ballasts for 48 inch, 72 inch and 96 inch slimline lamps are sound rated C and D and are the least quiet. Slimline ballasts should only be used in industrial/commercial applications where noise is not a problem. Energy saving ballasts, residential ballasts, and solid state (electronic) ballasts are sound rated A. You may hear them in a quiet room. However, in most applications, noise from sound rated A ballasts is covered up by the usual amount of ambient noise in a typical room. A loose magnetic ballast can be the cause of ballast hum. Check that ballast mounting screws are tight.