What size are your PC's? I have a 48" fixture with 2 250MH and 2 96W 36"PC. Wanted to change out the 250MH for 400MH. Decided to change the PC's out instead to T5's. My original PC's were 36" and I was able to change them to 4 54W T5's that were 48" More light coverage and was able to do it for under $150. A cheap upgrade that i'm glad i did.
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