Based on the introduction of LED spectral property and color coordinate,according to instability of LED color,effect of the temperature on spectral property and color coordinate of which white light source composed was analyzed,using additive color-mixing-equation,the method of controlling proportion of RGB LED flux to make trichromatic white light meet our requirements was validated.

This method can raise the accuracy of photoelectric integeral colorimetry to the level of spectral method,in the certain area ofchromaticity chart.

The ActiveX control for chromaticity coordinates transform among different chromatic spaces were developed under VC 6.

Radial intensity profile and chromaticity coordinates of the circumzenithal arcs are calculated with the theory of geometrical optics and the diffraction theory of light,the relative intensity curve and chromaticity curve of the circumzenithal arcs are shown.

The standard "Phosphors for Light Emitting Diodes" and its drawing up are introduced;in particular,the classification of phosphors for lighting emitting diodes,and their main performances about luminescent efficiency,temperature characteristics,spectral properties, chromaticity coordinates are defined based on the corresponding characterization and test method