I have a light box with three 8' fluorescent lights - 120V. All three comes on fine then goes off after an hour or so. Then after a few hours later, they come back on. A friend of mine told me that the ballast is getting too hot, and told me to replace it. I did with a new one with the exact wiring that the new light box came with, but the problem persists. I've read postings about ballast problems but I am not sure. Am I having a bad electrical circuit (power), a bad ballast, or bad bulbs???
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