first off ,where are you growin,,closet book shelf,,pc ,,depends on the space you have em in,,as too what you need,,I grow in a small closet,,temps can easily reach over a 100 in the summer,,unless you have air flow in,,and out,,and air movement inside,,I started with a 400 watt hps,,had high temps,,learned about ventilation here,,upgraded to a 600 watt,,and temps are lower,,so what's up??

Keep on Growin

HoLE