Fig. 1. Optical principle of sunlight reflection lighting system. (a) System light principle; (b) light emitting effect in light chasing process

Fig. 2. Relationship between relative position of lighting lens and parabolic reflector and light utilization rate. (a) Total reflection of reflector; (b) partial reflection of reflector

Fig. 3. Relationship between required length of mirror and half-aperture angle of lens

Fig. 4. Relationship between required length of lens and lens half-aperture angle during lens deflection

Fig. 5. Effect of lens deflection angle under different half-aperture angles on required length of mirror

Fig. 6. Effect of lens half-aperture angle on system light utilization rate at different time

Fig. 7. Luminous flux ratio of system at different time in a day simulated by Tracepro

Fig. 8. Tracepro simulates illumination of sunlight reflection lighting system in tunnel

Fig. 9. Developed solar reflection lighting system. (a) Solar reflective lighting system; (b) system lighting effect

Fig. 10. Lighting effect of sunlight reflection lighting system in tunnel. (a) Interior of tunnel illuminated by sunlight; (b) interior of tunnel without sunlight illumination

Fig. 11. Effect of sunlight reflection lighting system shooting vertically on wall

Fig. 12. Schematic diagram of test partition and distribution point of sunlight lighting area in tunnel

Fig. 13. Brightness test distribution of sunlight lighting in tunnel

Fig. 14. Visual adaptation curve of tunnel lighting