50 watts per sq. ft. is suposed to be ideal .
5' x 8' = 40' x 50w. = 2000 watts.

Are the 9 plants from clone ?
Are they all female ?
How long are you gonna veg them ?
Topping , f.i.m , l.s.t ?

Peace
Crispi :jointsmile:
xcrispi Reviewed by xcrispi on . Replace Mag 1000w w/Electronic 600w ballast??? I'm having a REALLY hard time deciding on how much light to buy for my recirculating dwc grow. I'm about 3 weeks away from needing to step up to HID lighting for my 9 "Pure Power Plants'. Here are the specs on the grow: 9 5gal DWC buckets 8'x5' flower room 7' hight 2 air cooled hoods 465cfm fan A/C De-Humid Rating: 5