Hey thanks for the reply, that formula's really useful. BTW your diy growroom was the inspiration for this one.
Im thinking now that the active space will be more like 6x8, so 2400 square ft.
Perhaps 3 600 w hps lights, in a row a couple feet apart so they can be connected would work well?
What would be the better option? 2x1000 or 3x600 if price isnt really a factor?
btw this is the light rig im looking at
DIGITAL 600 w HPS ballast AIR COOLED grow light KIT - (eBay.ca item 280192909413 end time 15-Feb-08 13:13:12 EST)


OK i cant figure out how to put up a pic but this is sort of like what im thinking:
[ = light
# = Work space/not as lit up
D = door
V = exhaust


00000V#
000000#
00[000#
000000#
00[000#
000000#
00[000#
000000D

I basically want a setup using these 600 hps systems, maybe as many as 4, to max my yield opportunities in this space.

Thanks Again!