Realization of LED uniform lighting on different occasions

The characteristics of the light emitting diode （LED）limit its applications in various lighting fields. The allocation of LED power to form an ideal luminance on a target plane was investigated. This paper analyzed the designs of optical systems on different applications, obtained the formula of the lens by adopting etendue conservation method in non-imaging optics, achieved round uniform illumination with 85% uniformity and rectangular uniform illumination with 75% uniformity, established the 3D model of the freeform lens, and conducted the ray tracing based on TracePro. The simulation results meet the corresponding standard, which validates the design.