When there is no pedestrian at night, the brightness of the lamp is 30%. When the pedestrian is close to the sensing area for about 8 meters, the brightness of the lamp is 100% bright. When the pedestrian leaves, the street lamp will last for 15 seconds and the brightness will be 100%. After 15 seconds, the brightness of the street lamp will be 100 % drops to 30%, waiting for the next time to light up.