Go here to calculate cost of electrity for HIDs. Oh and check your bill for the cost for 1 kilowatt hour. Should be $0.5 to $0.15

http://www.overgrow.com/tools/powercost.php
Dimebag Reviewed by Dimebag on . electric ok this is the deal ive got a 400w hp and ive had the bill come in and dame it is ent good what i need to know is how much does it cost to run a 400w for 12-12 a mouth eny othere figers would be great thanks o and this is in england..... this info is really in portant.... :eek: Rating: 5