Our Lighting Cost Savings Calculator is a sophisticated tool that compares two different lighting types of your choosing to each other and tells you how much one saves over the other using 3 methods 1) cost per year, 2) payback period and 3) net present value analysis. A detailed explanation and calculator spreadsheet with tabs containing 3 examples are provided, along with a blank worksheet for you to complete with your own project. The blank tab and 3 example tabs will appear at the lower left of the calculator spreadsheet.