Design of uniform and long distance illumination system based on single LED

Abstract

In view of shortcomings of existing LED lighting system with large volume, complicated structure and short working distance, a new design method of single LED projection system with light weight, good uniformity and long distance illumination is proposed. Based on the theory of illumination design, combined with non-imaging design and imaging design method, a projection lighting system composed of single high power LED, condenser lens, aperture stop and projection objective is designed. Firstly, the condenser concentrates lights emitting from LED and converges them to lightening plane, and then objective lens project light spot at lightening plane onto receiving surface with specified distance. The system uses a full-transmission structure, easy to process and install. Single high-power LED as a light source can effectively reduce the system size and mass. Experimental results show that this system can form illumination with uniformity of more than 90% in the range of 3 m~3 km. The system ensure good image quality and distortion of projection plane being less than 5%, which can satisfy requirements of uniform illumination and projection over a long distance.