i check my homedepot store online and this is the biggest cfl light they have = http://www.homedepot.com/Electrical-Light-Bulbs-Compact-Tube-Fluorescents-Compact-Fluorescents/h_d1/N-5yc1vZbmatZ1z117n3/R-100676712/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053 , if i use that or maybe 2, that would make my box too hot? i could add an oscillating fan like i said before, but what if the plants get bigger i got no where to put the oscillating fan since i would be putting it on the floor of the box. help +rep