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Standardization of LED Measurements

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Dr. C. Cameron Miller and Dr. Yoshi Ohno, National Institute of Standards and Technology

Today, standards development remains a critical concern for LED manufacturers. One standard publication of note is Publication No. 127, Measurement of LEDs, which was published in 1997 by the Commission Internationale de L'Eclairage (CIE) to establish guidelines primarily for measuring the luminous intensity of LEDs.1 This is perhaps more complex than it sounds because luminous intensity is a quantity that describes a point source, and most LEDs are not point sources. Hence, the measured luminous intensity varies, depending on the distance and size of the photometer's aperture. To solve...Read full article

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    Published: September 2004
    Glossary
    luminous intensity
    Luminous flux emitted by a source in a given range of directions; the unit of measure is the lumen/steradian, now known as the candela.
    ConsumerFeaturesgeometriesLED manufacturersluminous intensitypoint sourcesSensors & Detectors

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