I grow 12 / 12 CFL from Seed. You won't get big yields unless you have the higher wattage lights, or a bunch of the low wattage lights. I'm running 4 x 65 watt CFL's (the 300 Watt Equivalent) I just got in my 100 Watt CFL's ( i think they are the 6-8 hundred watt replacements) but any ways...