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Just the ballasts? Or the lamps in either one?
Ballasts you change out when they go bad.
T5 Lamps every 9 months
Metal Halides every 12 months
Why would you change the ballasts? As long as you are getting good light and change the bulbs regularly then it should be fine.
I'd change out the flickering lamp with a new one before changing the ballast. But yea, thats usually what happens.Thanks for replying.
just the ballast I was looking for answer.how do we know the ballast is bad? flickering bulb!!

