全光谱白光LED的混色研究

Investigation on Mixture of Full Spectrum White LEDs

目前市场上全光谱白光LED能够做到在可见光范围内光谱连续,接近太阳光光谱。采用一种这类全光谱白光LED进行混色的方法,通过理论计算与实验测试研究了不同色温的全光谱白光LED混色后光效、色温Tc及显色指数R_a的变化。实验采用3 000,4 000 K和5 000 K三种全光谱白光LED样品进行混色,通过控制工作电流和不同组合方式研究全光谱白光的混色效果。理论与实验表明:理论计算值和实验测试值一致;电流的改变对色度学参数几乎没有影响;混色后白光光效能保证在100 lm/W以上;色温可以实现在3000～5 000 K可调;显色指数Ra可以高达92～97。

At present,full-spectrum white LEDs on the market could achieve continuous spectrum within the visible light range,which were close to the solar spectrum.Based on the mixture of these full-spectrum white LEDs,luminous efficacy,color temperature and color rending index were analyzed by theories and experiments.Three full-spectrum white LED samples of different color temperature(3000,4000K and5000K)were mixed.The dimming effect was analyzed by changing with forward current and different combinations.The results showed that the theoretical and experimental values were consistent;the change of current had little effect on the chromaticity parameters;the luminous efficacy could be guaranteed to be over100lm/W;the range of color temperature of mixed white LEDs was3000~5000K;the color rendering index was92~97.