摘要
The new standards for the photometric characterization of light-emitting diode(LED)sources and luminaries require the measurement evaluation of photometric and colorimetric quantities.This present work studies the performance of some types of LED light sources in different spectra and different color temperature for photometric and colorimetric applications.The study depends on mixed spectra of these different types of LEDs to enhance the color rendering index(CRI)to be near as possible to standard sources.Characterization of LED sources requires the evaluation of some photometric and colorimetric quantities such as luminous flux(),chromaticity coordinates(x,y)and(u′,v′),correlated color temperature(CCT)and color rending indices(CRI).
