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IES TM-21-19
M00000671
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IES TM-21-19 Technical Memorandum: Projecting Long-Term Lumen, Photon, and Radiant Flux Maintenance of LED Light Sources
standard by Illuminating Engineering Society, 2019
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This document provides recommendations for projecting flux maintenance of LED light sources using data obtained when testing them per ANSI/IES LM-80-15, Approved Method for Measuring Luminous Flux and Color Maintenance of LED Packages, Arrays and Modules.This method shall not be used to project lumen, photon or radiant flux maintenance below 70%.