You can use it in it . I have MV/MH low bay fixture that supose to hang in a wharehouse..It does work , im using it right now . A sticker on my ballast says its for MV/MH/400W/H33/M59 bulbs...if that helps at all....peace

What did it do for you to think it wont work ? Was the light dim? If so , give a couple min. to get fully charged up , bulb has to be hott to be the brightest...lol