Some bulbs, say 400w, use M59. Other 400s use M135. Some prefer using the Son Agro. Iwasaki bulbs work best on a hybrid ballast (HPS). 250w bulbs can use the M58 or M80, depending on the bulb. Does your bulb have an internal ignitor? If not, you'll need a pulse start ballast. Or maybe you'll decide you need electronic. How's the head?
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Brad
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