Caress of Steel
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As long as you can properly vent it, get as much wattage as you can afford, IMO. I also run a 1000 hps, in a 4x4 homebox for flowering, and it's great. 2 600's would be better tho'. There is a point of diminishing returns, but I think it's 100 watts p.s.f. or more. Not 100% sure about this however.