采用IES TM-30-18色域指数表征LED光源的色域面积,并对4种色温下的20个样品光源光谱进行间隔为5nm的380~780nm波段的单色光光谱叠加仿真,计算色域面积的变化。结果表明:在各样品光源光谱上叠加380~465nm或605~780nm波段的单色光后,光源色域面积增大;叠加470~600nm波段的单色光后,光源色域面积减小。对叠加的光谱采用灯箱匹配并进行色彩鲜艳度与偏好的视觉实验,结果表明,色域面积增加的光谱的色彩鲜艳度与颜色偏好优于色域面积减小的。同时叠加两个不同峰值波长且不同幅值功率的单色光时,光源的色温基本不变,且色域面积增加2~10。对叠加单色光后的光源光谱进行仿真,得到了光谱分布与色域面积的关系,这对于优化LED光源的色域面积和视觉效果有重要意义。

In this study, the IES TM-30-18 gamut index is used to characterize the gamut area of LED sources. Simultaneously, the spectra of 20 sample light sources at four color temperatures are simulated by the superposition of monochromatic light spectra in a 380--780 nm band with a 5-nm interval, and the change of the gamut area is calculated. The results show that the color gamut area of a light source increases after the monochromatic light of 380--465 or 605--780 nm superimposes on the spectrum of each sample light source, and decreases with the monochromatic spectral of a 470--600 nm band. A light box matching is performed to match the superimposed spectrum, and the visual experiment of color brightness and preference is conducted. The experimental results show that the brightness and color preference of the spectra with an increased color gamut area are better than those with a decreased gamut area. When two monochromatic lights with different peak wavelengths and amplitude powers are superimposed at the same time, the color temperature of the light sources can be kept substantially unchanged, whereas, the color gamut can be increased by 2--10. The relationship between the spectral distribution and gamut area is obtained by simulating the source spectrum after superimposing monochromatic light, which is of great significance for optimizing the color gamut area and visual effects of the LED light sources.