Jack, as far as I can tell, the bulb is fine. I think it was a house power/ballast problem.
I just switched to the Son Agro ballasts and they are awesome! I get 38% more light out of them, and the color is nicer.
I tried a Iwasaki 400 on my tank and would never use them. That's just me though, 'cause lots do use them!
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Brad
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