Quote Originally Posted by bud luv
Didn't he say an 8x4 space? 2200 watts in a 4x4 space would probably be a different story (and overkill/inefficient).
My bad, sorry for the confusion. It was 8x4. So I guess take whatever I said and divide that in half. I know it is 100% my fault, but in my defense I offer a stoney minds rendition of this from PharmaCan:

You would be much better off with two 1,000 watt lights. A 4'x4' footprint is kinda big for a 600 watt. You would also be better with reflectors instead of cool tubes - you'll get better light distribution

(WELL PERHAPS I SKIMMED A LITTLE TOO, CAN'T REMEMBER.)

PharmaCan, I also am wondering if you and I are talking about the same reflector for the cool tube. Are you talking about the one that comes with the cool tube, or one that you can buy as an accessory, that is bigger and more realistic? I only grow in a 3x3 space, but my plants never seem to show a need for more light, and I use a cool tube. I don't use the aftermarket reflector though. My tube is encased in a thing that vents the tube and supplies air flow for the plants, as it is reflecting light, since it is white.