对于白光照明而言，显色指数（CRI）和暗视觉下光通量与明视觉下光通量的比值（S/P）是衡量白光光源质量的两个重要参数。CRI反映的是待测光源下物体色彩还原能力；而S/P值越高的光源下人眼视物越清晰，对节能也具有一定作用。一般而言，这两个参数越高越好；然而在实际中，两者是一对矛盾体。当前的大部分白光光源的S/P值普遍低于2.5。白光发光二极管（LED）具有光谱可调特性，因此可以通过优化光谱，在满足一定的CRI下获得更高的S/P值。首先模拟光谱，然后通过计算机编程调节光谱峰值波长、相对光强度等光谱参数，最终获得高色温（6500 K）下高S/P值光谱，对于节能照明光源设计具有重要参考价值。%For white light illumination, color rendering index (CRI) and scotopic/photopic (S/P) ratio are two critical parameters to evaluate the quality of white light source. The CRI is introduced to describe the color fidelity of objects under tested light sources. Under light sources with higher S/P values, human eyes can see more clearly, and it also has a certain effect on energy saving. In general, the higher is the values of the two parameters, the quali⁃ty of the illumination effect is better. However, there is a trade-off between them. The S/P value of most of the cur⁃rent white light sources is generally less than 2.5. White light emitting diode (LED) has spectrum adjustment charac⁃teristic, so higher S/P value is obtained under the condition of meeting the certain CRI through optimizing spectrum. Firstly, LED spectrum is simulated, and then spectrum parameters such as spectrum peak wavelength and relative light intensity are adjusted through computer programming. Finally, high S/P value spectrum under the high color temperature of 6 500 K is obtained, which has an important reference value for energy-saving illumination lighting source design.
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