323 square feet??? lol u could grow about 80 plants in that!!!! u want something just the rite size for the plants to make em comfortable but not confined. u need about 1foot squared per plant give em some room but not too much they will fill 41inches nicely
ur best bet is to use flourcesents or CFCs ( same thing) about 200watt per plant . there great!!!!
not much heat so no need to worry about temp too much stays constant n cheap on electricity
i used 2 100watt standard cfc used in homes and my vry first crop was a sucess!
hope this helps