The New CIE 127 Standard for LED Measurement

Carissa Say and Richard Young

Recently, the CIE has published an updated version of its ubiquitous lighting standard, the CIE 127. Among other things, the new standard refines the technique for measuring total radiant flux and introduces a concept called partial LED flux.


imagePartial and total LED flux measurement systems.

Anyone who works in the LED industry is familiar with the Inter-national Commission on Lighting’s (CIE) document on LED measurements, called the CIE 127:1997. The document describes techniques for measuring various photometric and radiometric quantities that are important to manufacturers and users of LEDs. This industry standard allows different researchers—sometimes halfway across the world from one another—to compare measurements in a meaningful way.

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