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My light/good has made a buzzing noise since I got it, but is intermittently getting worse now. Do all lights/hoods buzz or just mine? It's a t8 fluorescent that came with the canopy. I'm assuming not great quality.
They will start to buzz when the ballast are going bad. Do your lights flicker any? That is another sign of a bad ballast or light bulb about to go. If it is really old it would probably be cheaper to get another light than replace the ballast. Try changing the bulbs first. If that doesn't fix it than the ballast are the problem.