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Hamamatsu Corp. - Earth Innovations LB 2/24

Improved Photometric Testing for High-Power LEDs

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Jeff Hulett, Vektrex

The LM-85 approved method for electrical photometric measurement of high-power LEDs harmonizes the methods currently in use and addresses measurement consistency issues. This is the first in a two-part series. The standardized photometric testing methods in use today – Commission Internationale de l’Éclairage (CIE) 127 and Illuminating Engineering Society of North America (IESNA) LM-79 – were originally adapted from tests for incandescent and other electric lamps. In these methods, the lamp is powered continuously, and long stabilization times are mandated. ...Read full article

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    Published: April 2015
    FeaturesLEDsLight SourcesTest & Measurementphotometric testinghigh-power LEDstabilization timeLM-85CIE 127LM-79junction temperatureLED photometrytemperature control platformthermoelectric coolercontinuous-pulsepulse width modulationsingle-pulsedirect currentYuqin ZongNational Institute of Standards and TechnologyJeff HulettVektrex

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