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ANSI/IES LM-84-20

Approved Method: Measuring Luminous Flux and Color Maintenance of LED Lamps, Light Engines, and Luminaires

This document provides the method for measuring the luminous, radiant, and/or photon flux, as well as chromaticity and other spectral properties over time. This method applies to LED lamps, LED light engines, LED luminaires, OLED light engines, and OLED luminaires. The method describes the procedures to be followed and the precautions to be observed in both initial determination and reproduction of results for determining luminous, radiant, and/or photon flux, and spectral power distribution (SPD) and chromaticity as spectral maintenance measurements, under standard operating conditions.

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Illuminating Engineering Society of North America [iesna]

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