Along with the development of semiconductor lighting technology, LED chip is widely used as the source of the glare
flashlight. Collimating the light of the source and improving the utilization rate of light energy is crucial. The collimating
lens is designed by the theory of geometrical optics and the theory of non-imaging optics. The small angle light from the
source is collimated through the collimating lens surface, and the large angle light is collimated by the total reflection of
the collimating lens. The collimating lens has a high light energy utilization and a good collimating performance. The
collimation system is simulated and optimized in the Lighttools software. When the size of the LED chip is 1 mm*1 mm,
the energy utilization rate of the collimating lens is more than 95%, and most lighting area radii are no more than 8 m
when the illuminated plane is 500 m away from the light source.