Buyers considering industrial LED lighting are faced with vendor claims about LED lifetimes that range from conservative to ambitious. Because LEDs are tested differently from other light sources, it is helpful to understand the process and how lifetime ratings are calculated for all industrial lighting alternatives. This paper, written by LED lighting industry veteran Fritz Morgan, explains the IES testing standards, and outlines what industrial lighting customers should look for when evaluating solutions.Buyers considering industrial LED lighting are faced with vendor claims about LED lifetimes that range from conservative to ambitious. Because LEDs are tested differently from other light sources, it is helpful to understand the process and how lifetime ratings are calculated for all industrial lighting alternatives. This paper, written by LED lighting industry veteran Fritz Morgan, explains the IES testing standards, and outlines what industrial lighting customers should look for when evaluating solutions.