Light source using high brightness LED, constant voltage constant current power supply to reduce lumen. Through the Ministry of Public Security Traffic Safety Products Quality Supervision and Testing Center. Power by CE (EN) certification, the shell polycarbonate (PC) one-time injection molding of engineering materials and light weight. Waterproof fire-retardant silicone seal, double seal protection greater than IP54. The whole lamp life of more than a decade, anti-vibration and wind pressure.