This report was prepared by Ian Ashdown, Steve Fotios, Matt Hartley,  Glenn Heinmiller, and Nathaniel Jones, in collaboration with the National Electrical Manufacturers Association, and published on October 2021. The report provides insight into the proper use of the Unified Glare Rating (UGR) for lighting design to meet application and task visual needs. Consideration is given to the historical background of UGR, literature review, and standards to clarify the intended use, embedded assumptions, and correct lighting design use. The information provided will help organizations and individuals to create better lighting designs.

Keywords: Architecture/Engineering, Association, Energy Efficiency/Management, Lighting Systems/Controls, Protocols/Standards