I want to know how much my fluorescents are costing me every month and don't know how to do the calculations. Maybe I don't have enough info? Anyway, if someone could help me I'd appreciate it.
I have 7 48" shop lights, each with two bulbs, Phillips 40W F40T12/DX. My electricity costs 9.7 cents/KWH. I run them 16 hours/day. How much would this cost me in a 30 day month?