Abstract: With the method of nonimaging and freeform surface, it designed and researched two kinds of secondary optical devices, reflectors and lens. Optical devices with round uniform illumination characteristics were achieved. Through the programming calculation, the geometric profile of the optical devices was structured and simulated. A good uniform round lighting spot was obtained. The illumination uniformity of the round lighting surface is above 90%, suitable for higher uniformity requirements for indoor lighting. The research provides some reference for the design of high power LED uniform lighting.

Key words: non-imaging；freeform；reflector；lens；uniform illumination