Intelligent system design for variable color temperature LED street light

As technology advances, it is an urgent matter to develop a smart street light for energy saving and road safety. In this paper, we present a system design of LED street light which integrates multicolor LED, power driving IC, and embedded image processing. The embedded system is used to monitor the road status and output control instruction. As the fog or rain is detected, the embedded system immediately instructs the power IC to drive multi-color LEDs for generating the lower color temperature light. The range of changing color temperature is from 6500K into 2800K. This proposed LED street light can be widely used to improve the road safety for pedestrian and driver in intelligent city.