The development of new and improved light sources for general lighting has proceeded at a rapid and accelerating pace. There is a wide selection of sources, luminaries, and controls, and it is probable that any one of several basic choices could be used for a given light application. While the general characteristics can be provided, a definitive list with absolute values for all types and manufacturers would be too extensive for this guide. Lighting energy conservation is important, as it can account for up to 50% of a building’s electrical energy consumption. Here are a few important considerations …