为得到构成白光LED光谱的主要单色光对中国传统淡彩绘画色彩的影响规律, 确定不同波长单色光对绘画色彩的量化损伤程度, 进而根据研究结果得到最低损伤白光LED的光谱功率分布, 以构成白光LED光谱的4种主要单色光作为实验光源, 分组照射中国传统淡彩绘画模型试件。在每个照射周期后, 对试件的色彩参数进行检测, 根据检测数据绘制主波长、兴奋纯度、亮度3个参数随总曝光量积累的衰变曲线, 基于曲线分析得到各种淡彩绘画颜料在光照下的色彩衰变规律, 并根据实验数据计算得到4种单色光对绘画色彩主波长的影响关系为482 nm∶510 nm∶583 nm∶650 nm=8 147∶9 067∶9 772∶9 121; 对兴奋纯度的影响关系为482 nm∶510 nm∶583 nm∶650 nm=89 446∶85 250∶76 895∶69 229; 对亮度的影响关系为482 nm∶510 nm∶583 nm∶650 nm=137∶238∶190∶177。

Optical radiation from any light source causes permanent damage to the color of high-responsivity Chinese traditional paintings. The white light emitting diode (WLED) is flexible, efficient, and can create similar color phenomena within different spectra, simplifying the adjustment of spectral irradiance distribution according to specific requirements. Establishing quantitative influence rules of WLED monochromatic light for protecting traditional paintings is the key. In this study, four typical monochromatic light sources (red, yellow, green, and blue) comprising the WLED spectrum were used to illuminate specimens of Chinese traditional light color paintings, then the CIE XYZ were measured periodically. Each specimen was manufactured with four organic pigments. The dominant wavelength, excitation purity, and lightness were calculated based on the data. Firstly, the curves showing the chromaticity change of different pigments under different light sources were analyzed to determine the color change rules. Secondly, the color change values were calculated to determine the influence of light sources on the painting. The quantitative influencing relationship on the dominant wavelength of painting color is 482 nm∶510 nm∶583 nm∶650 nm=8 147∶9 067∶9 772∶9 121. The quantitative influencing relationship on the excitation purity of painting color is 482 nm∶510 nm∶583 nm∶650 nm=89 446∶85 250∶76 895∶69 229. The quantitative influencing relationship on the lightness of painting color is 482 nm∶510 nm∶583 nm∶650 nm=137∶238∶190∶177. These results provide a reference for the spectral irradiance distribution of minimum-damage WLED for different light color paintings.