This document will help answer many types of lighting economic questions. It provides a framework for selecting from a group of competing lighting designs. It gives insight into the question of when a system under consideration will "pay off." It can help the lighting professional make energy conservation decisions. Most important, it provides methods for gauging the profitability of a capital investment in a lighting system, which can be objectively compared to other competing capital investments. It is important to note that this document is written from the point of view that "economic analysis" is not the same as "how to beat the budget." Rather than considering economic analysis as the antithesis of engineering or artistic analysis, it should be thought of as subsuming these other needs.