If I have 2 42w cfls and 2 20w cfls. and they run 12/12 how much would that draw on a bill.... Because my roommate is trying to say I ran the bill up 50 bucks in a like half month.... With that and one air pump a small one at that for a dwc bucket... So hes trying to make me pay 50bucks for a month where I ran the setup for half the month. So I pretty much pulled my whole setup at my house and move it all back to my old spot. How can I calculate the watts? I dont know what my rate per w is tho... I live in the southeast in that helps.