可调色温的高显色指数LED白光光源的实验研究

Experimental Study on Tunable Color Temperature White Light with High Color Rendering Index

摘要:

采用暖白、绿、蓝LED混光和PWM调光技术, 研究了光源的光谱、色温可调和显色指数特性。实验通过控制驱动电流的占空比, 调节暖白、绿、蓝LED之间的光通量配比, 实现了在3000～6500K范围内色温可调、R_a为85～95的高显色指数LED白光。混合光源的实验参数与理论计算值相一致。

Abstract:

Warm white, blue and green LED mixing and PWM dimming technologies were applied to study the spectra, color temperature and color rendering index(CRI) of the mixed white light. By controlling the pulse-width of the driving current to change the luminous flux ratio among warm white, blue and green LEDs, a tunable color temperature white light with high CRI was realized experimentally, realizing a tunable color temperature range of 3000～6500K and a CRI range of 85～95. The experimental results agree well with the theoretical calculations.