you are probably going to want some compact floro's you can get them fairly cheap at home depot just get a couple of them and a multiple socket fixture so u can put a couple of them in there if you want. I am growing in a 2'x2'x4' box and using a 125w comp floro grow light(too big for your spacing situation) but it would have been way cheaper if my dumbass would have went to HD lol....anyways also i bought a 4 1/2" computer fan and it works very weel so try to do something like that. check out some threads about homemade cfl fixtures...i saw one on here yesterday and the guy had about 3 coming out of one fixture and he had small spacing and his plants looked excellent to me.. lataz