Standardization of LED Measurements
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...
Photonics Spectra, September 2004