I have 500 true watts of cfl in 4x 125watt in a 1,2x1.2x2.0 and i would never try flower with cfl tho as your buds will be all fluffy and not as great as they would be running a 600 watt hps or 2, As soon as funds come i will be upgrading to 600 cooltube for my tent i just need a kickass fan for it