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11-01-2008, 03:58 AM#2
Senior Member
friend gave 250watt hps bulb but all i have is a 150w rated ballast?
A 250 watt HPS bulb needs a 250 watt, rated ballast. Also; if the bulb is HPS, the ballast needs to be the same or 'switchable'. Some ballasts are switchable (between HPS/MH) ...some are not.
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