Using lightweight aluminum alloy housing, the weight of the lamp is less than 10kg. The protection level of LED light source cavity and electrical cavity is designed according to IP65, and the cooling cavity is designed according to IP23. The light source cavity and the heat dissipation cavity are isolated in a reasonable way to avoid the mutual influence of heat flow between the light source cavity and the heat dissipation cavity. Because the air in the tunnel is not circulated, and the automobile exhaust is doped with it, the composition is complex, so the LED tunnel lamp should have good corrosion resistance, exhaust gas, smoke and other chemicals contained in the atmosphere in the tunnel, and the external surface of each structural component is anti-corrosion treatment, so that it meets the anti-corrosion requirements of GB/T7000.5.