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Why do I hear a hum or buzz every time I turn on my light? - Jamie Everett , 2009-02-27 15:42:50

All dimmers create noise from the lamp, transformer or the dimmer itself. A loud buzz is a signal that the dimmer and transformer are not compatible. A mild low volume hum is normal. Whether the noise is objectionable depends on what you are dimming, how quiet the room is, how much sound the furniture and surfaces absorb, and how sensitive the customer is.

- Allen Lee