CIE 127:2007 PDF Download

The CIE 127:2007 standard addresses the measurement of LEDs, providing updated guidance from the previous 1997 edition. LEDs have unique characteristics that necessitate the introduction of new quantities for their characterization, with defined measurement conditions. Key quantities introduced in this standard include "Averaged LED Intensity" (ALI) and "Partial LED Flux".

The report offers detailed explanations of the measurement conditions for ALI, Total and Partial LED Flux, and Spectral Power Distribution. It emphasizes the importance of using standardized LED samples or applying color correction when comparing similar colored LEDs. The standard LEDs used for measurements need to be calibrated by National Metrology Laboratories or laboratories that are traceable to such authorities.

The standard is primarily written in English, but it also includes a brief summary in French and German to cater to a wider audience.