根据全日日光色温和亮度的变化曲线，利用RGBW四色LED混光模拟全日日光色温和亮度的变化，并采用遗传算法优化混合光的显色指数.采用Matlab进行仿真，并基于Arduino开源平台搭建日光模拟系统对仿真结果进行验证.实验表明，该策略可准确模拟全日日光色温和亮度的变化规律，同时通过遗传算法的优化可使LED混合光兼具最优的显色性能，验证了所提策略的正确性和有效性.该策略可应用于密闭环境照明、植物照明等特殊照明领域的日光模拟仿真试验和工程实践.

According to the diurnal variation of color temperature and brightness of sunlight, a strategy was proposed to simulate the diurnal variation of color temperature and brightness of sunlight by light mixing of RGBW-LEDs, and the genetic algorithm was used to optimize the color rendering index. The simulation was conducted by Matlab, and the simulation results were validated by the sunlight simulation system based on the Arduino open source platform. The experiment shows that using mixed light based on RGBW-LEDs can accurately simulate the change rule of sunlight′ color temperature and brightness, and make LED mixed light have the optimal color rendering property through the optimization of genetic algorithm, so that the correctness and effectiveness of the proposed strategy were verified. The sunlight simulation strategy can be applied to the field of solar simulation and engineering practice for special lighting fields, such as enclosed environment lighting and plant lighting and so on.