基于LED电流、温度光谱模型的照明系统研究

电流、温度的改变都会影响LED光谱分布，从而影响光源的视觉和非视觉参数。文中从基于LED芯片发光材料中光子能级分布规律的光谱模型出发，对RGBY四色LED建立电流、温度模型，拟合的R-square可达到0.99。在此基础上，通过遗传算法对昼夜节律因子和辐射发光效率进行多目标优化，在照度为300 lx时，设计8组兼顾视觉参数（显色指数和蓝光危害效率）以及非视觉参数（昼夜节律刺激）的照明方案，通过这些方案验证了该模型的可行性。接着，探究两种非视觉参数和温度的关系，结果表明昼夜节律因子均随温度的增加而升高，但昼夜节律刺激却随温度的增加而减小。这种情况的原因是两种参数受照度的影响不同，对照度补偿后，发现两种非视觉参数均随温度的升高而增大，二者呈现一定的正相关性。该研究从光源光谱的角度入手，为LED照明光源设计中非视觉效应的考量提供参考依据。

Research on lighting system based on LED current and temperature spectrum model

Changes in current and temperature can affect the spectral distribution of the LED, which in turn affects the visual and non-visual parameters of the light source. In this paper, starting from the spectral model based on the distribution of photon energy levels in the LED chip luminescent material, the current and temperature model was established for the RGBY four-color LED. The R-square of the spectral fitting could reach 0.99. On this basis, the genetic algorithm (GA) was used to optimize the circadian rhythm factor and luminous efficiency with multiple objectives. When the illuminance was 300 lx, 8 sets of visual parameters (color rendering index and blue light hazard efficiency) and non-visual parameters ( circadian rhythm stimulus) were designed to verify the feasibility of this model. Then, the relationship between two non visual parameters and temperature was explored. The results show that the circadian rhythm factors increased with the increase of temperature, but the circadian rhythm stimulus decreased with the increase of temperature. The reason for this situation was that the two parameters were differently affected by the illuminance. After compensating the illuminance of the light source, it was found that the two non-visual parameters both increased with the increase of temperature, and the two showed a certain positive correlation. This research started from the perspective of the light source spectrum and provided a reference for the consideration of non-visual effects in the design of LED lighting sources.