LED is a photoelectric device, at present in the world’s leading high-power LED, its working process is only 15% to 20% of the electrical energy into light energy, most of the rest of the electrical energy into heat, so that the temperature of the LED rise. On the other hand, the lumen output of the LED decreases with the increase of the LED junction temperature, and the LED life decreases with the increase of the junction temperature. Therefore, the heat dissipation of LED will be directly related to the use effect and life of tunnel lamps.

At present, there are three main ways of heat dissipation of high-power LED: (1) natural heat dissipation, forced heat dissipation of fan and heat pipe plus heat dissipation fin technology. Natural heat dissipation using natural convection and thermal radiation, the structure is reliable, easy to do waterproof, but the structural design of the lamp body itself is high. The forced heat dissipation of the fan is mainly achieved by forced convection, and the heat dissipation speed is fast, but the cost and noise are high, and it is difficult to make waterproof. ③ Heat pipe plus heat fin technology mainly uses heat pipes to rapidly conduct the heat generated by the LED to the heat fin to achieve the purpose of heat dissipation, no moving parts, the system is stable, but the cost is relatively high.

Since the tunnel has its unique properties compared with the general road, we use the heat pipe plus heat fin technology for heat dissipation treatment, the hot channel vertical design, to achieve modular heat dissipation, so that the LED junction temperature is kept below 70℃, to ensure that the LED long-term low light decay under the stable work, improve the maintenance factor of the lamp, save maintenance costs.

According to the flow characteristics of the air flow in the tunnel, the asymmetric ventilation design of the heat dissipation chamber is carried out to ensure the convective heat dissipation of the air, and at the same time to reduce the pollution such as oil smoke generated by the car into the heat dissipation chamber, which will adsorb the heat dissipation structure and reduce the heat dissipation efficiency.