How much energy does a light bulb use, and how does lighting affect your electricity bill? How much will a lighting retrofit save you? How do you begin to estimate the value of a potential lighting rebate?
There’s one common thread that runs through each of these questions: the difference between watts (W), kilowatts (kW), and kilowatt-hours (kWh). Calculating watts to kWh could help you understand the answers to the questions above.