Research on Testing System for Three-dimensional Distribution of Luminous Intensity of LED

In terms of asymmetrical three-dimensional distribution（ID） of luminous intensity（LI） of lightemitting-diode（LED）, a testing system was conducted in this study. Design and principle of the testing system were introduced. 31 photometers were placed on a concentric circle, and all of them were used to gather LI data of LED at the same time. The data acquisition card（DAC） was used to gather multichannel data and controlled motor. Experimental results indicated that the testing system had achieved the goal of testing threedimensional distribution of LI. And each parameter could meet the requirements of industrial production and measurement.