Fig. 1. Section view of new LED collimation system

Fig. 2. Design process of incident plane of freeform surface

Fig. 3. Coordinate points of incident surface of freeform surface

Fig. 4. Coordinate data of reflector

Fig. 5. Entity model of the collimation system

Fig. 6. Relationship between freeform surface and the light beam in cylindrical coordinate

Fig. 7. Topological relation of energy. (a) Topological relation of energy under uniform rectangular spot; (b) topological relation of energy under uniform rectangular spot in the first quadrant

Fig. 8. (a) Diagram of ray tracing simulation; (b) curve of light intensity distribution; (c) diagram of illumination distribution

Fig. 9. Coordinate data of freeform surface in the first quadrant

Fig. 10. Entity model of freeform surface

Fig. 11. Diagram of ray tracing simulation

Fig. 12. Diagram of luminous intensity distribution