Design and optical characteristics simulation of LED plant lighting source

LED plant lighting source has the advantages of high photoelectric conversion efficiency and adjustable spectrum, so it has a broader application prospect than traditional light source with high cost and low energy saving. However, because the light source includes multi-band spectra such as blue light, red light and ultraviolet, the combination of light source array will lead to the problem of uneven illuminance in the illumination area. Therefore, it is necessary to improve the uniformity of the illumination area by spectral optimization design. In this paper, optical simulation software was used to model and simulate the LED light source array, and the illuminance distribution of a single LED was analyzed. On the basis of the illuminance calculation formula, red, blue, infrared and ultraviolet LED were selected to establish a 7×7 square, triangle and ring array, and the simulation and ray tracing were carried out. The simulation results showed that: The illuminance uniformity U of square, triangle and ring arrays are 61.9%, 58.5% and 55.8%, respectively. Then the spacing of the square array was optimized, and the illuminance uniformity was increased from 61.9% to 80%.