There has been a great deal of research and discussion in the lighting industry regarding the impact of artificial lighting on human health and well-being. For example, it has been well documented that worker exposure to blue-rich light sources on evening and night shifts disrupts the body’s biological clock, impairs performance and sleep, and increases the risk of a variety of medical conditions. Other research has demonstrated the beneficial effect of the use of lighting with proper spectral content on alertness and worker performance in the daytime. However, until recently there have been no industry-wide standards that address these issues. This panel will review and discuss newly developed circadian lighting standards such as those contained in the American Petroleum Institute ANSI Recommended Practice for Workplace Lighting and those proposed by the UL Task Group on Circadian Lighting.