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Loud Ballast Humm


ACampbell

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I noticed this morning that my ballast was humming quite loudly when my lights first came on. I'm not usually home when they come on, so no telling how long it's been doing this. Would you consider that normal behavior for them? Its a PFO 400 Watt Dual HQI Metal Halide Ballast.

Thats quite normal your ballast should be fine

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The only thing I would be concerned with is if one is considerably hotter than the other. The hum is unfortunately normal with magnetic ballasts. You should hear the 1000w version in our warehouse. I don't know how the guys work back there.

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