... 50-60% of traditional high bay lights.Light go downward, no waste of upward light. Light efficiency is more than 88 ... %.2. Long Lifespan 50,000 hours. 3.Durable heat sink aluminium frame.IP65, can be used both indoor and ... lamp shell and power supply.5. Eco-friendly,No UV radiation, No heat radiation, No noise, No lead and mercury. Application:1,Home lighting2,Office ...