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IES TM-21-19

Technical Memorandum: Projecting Long-Term Lumen, Photon, and Radiant Flux Maintenance of LED Light Sources

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%.