Testing performance of IES color fidelity index in optimizing spectra of light sources based on multi-color LEDs
The method of producing white light by mixing multi-color LEDs has much greater flexibility to achieve optimal light quality, such as excellent color rendition capacity or high luminous efficiency, than the phosphor-converted (PC) approach. The newly proposed two-measure system for evaluating color rendition of light sources by the Illuminating Engineering Society of North America (IES) is targeted for improving the deficiencies of the Commission Internationale de lEclairage (CIE) color rendering index, which is currently the most widely accepted metric. In this study, IES color fidelity index (Rf) and CIE general color rendering index (Ra) were employed to optimize the color quality of white light composed of three- or four-color LEDs via a differential evolution algorithm, which is applicable for solving global optimization problems. The results indicate that, in a wide range of correlated color temperature from 2800K to 6500K, for the mixed light sources through three-color LEDs the optimal peak wavelength of individual LED generally shifts to short wavelength when optimizing Rf, as opposed to the situation occurring when optimizing Ra. However, the sources with four-color LEDs nearly do the opposite. In addition, the light sources with optimal Rf always possess pretty good Ra, and vice versa, whereas they render saturated red color relatively poorly in comparison with those having optimal Ra.
Light source multi-color LEDs color rendition IES color fidelity index spectral optimization
Fuzheng Zhang Haisong Xu
State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
国际会议
The 3rd Conference of Asia Color Association(ACA2016 China)第三届亚洲颜色学术会议
江苏 常熟
英文
93-96
2016-05-21（万方平台首次上网日期，不代表论文的发表时间）