The average U.S. rate is $0.10 per kilowatt hour
Input the fully-loaded cost of a maintenance event (U.S. range is $50-250 per event)
Typical lifetimes are 1-2 years for MH (horizontal) and 2-4 years for HPS
Input the average cost you pay for each replacement lamp
Input the rebate under your utility rebate program (typically 25% of cost).
Input your price, less any rebates or discounts