Lol, I've been doin this since '86. These are intended for bottom side lighting. I would use6-8 of these. I have a multi-room grow, with main flowering 7x7x7. 2 x 1000w are used for flowering, co2 , etc. Looking to peak my yeilds out.I want to see if I can get near Hydro yeilds using soil. I know, I won't be able to duplicate them, but the ease of maintaining all this is worth the reduced yeilds.Although, Zandor makes a good case to run hydro :smokin: