if it's a magnetic ballast it should have one of these numbers on it somewhere.
150W M107 (It seems that M107 and M57 are used interchangeably for either 150W or 175W. I think the Bulb should have a
matching number on it.)
175W M57
250W M58
400W M59
1000W M47
1500W M48
1650W M112
Last edited by Static; 08-09-2007 at 05:46 PM.
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