hey on your thread, how much will cfls yeild, i was gonna say my friend made the smallest grow box using 1 cfl and his plant made it to harvest o.k. hahaha. he got about 1/4 off of 1 plant that he grew 12/12 from seed(so it was like 12-15 inches tall wen done) that's with only 1 cfl so i guess you could apply that to your setup and do tha math on it 
im actually doing the same thing right now. hope i helped man. good luck!
im actually doing the same thing right now. hope i helped man. good luck!