Is it an electronic ballast? SE? If so, I would strongly recommend an Iwakasi 15K. It is a PAR buster, meaning that particular ballast/bulb combination puts out an unusually high PAR for the amount of watts - more than many 250w combos. If that's your case, I would think that a single 175w would do the trick for you.
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~ Mindy
SPS fanatic.
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