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Hi Joan,
The hum is subtle, louder than other fluorescent fixtures in our house (which I can't hear at all), but quieter than the computer in my studio. It's constant, so my brain filters it out and it's certainly not loud enough to bother me. I don't know about bad ballasts, as both are new fixtures by different manufacturers, but both happen to have the same Sylvania ballast. If you're interested in the Lowes or Home Depot electronic fixtures, I would just try one and take it back if it bothers you. I would be curious what you find if you do buy one, however. You could also check if there's a specialty lighting store in your area, one in our area had just slightly more expensive electronic fixtures ~$35.
Good luck,
Holly
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