The LED light source is irradiated forward, the light is refracted by the light guide column and then converges the angle, and then refracted by the LENS. The cut-off line is imaged at a position 25 m in front of the light output efficiency. The light entrance surface of the light guide column is larger than the light-emitting area of the LED, and the LED and the light guide column are controlled. The light can almost 100% enter the light guide column, so the light output efficiency of the module can reach 82%
( The efficiency of the current reflective light source module with a 4 cm opening is 64% )