Discuss Fluorescent hum in bathroom light in the Lighting Forum area at ElectriciansForums.net

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If it’s happening when the lamp is off, it may not be the lamp at all.
Is it constant, or does it happen from when the switch is turned off and slowly disappates?

What else electrical is in the bathroom? Shaver points can hum as there’s a transformer inside them, same with heated mirrors (anti fog)

It could also be a loose connection in the switch causing high frequency arcing.

Try and pinpoint where the sound is coming from.
If it’s in the wall, it may be something outside the bathroom
 
Could it be an extractor fan with a run on timer?
 

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