Nowadays, the lifespan of led high bay could reach 50,000 hours theoretically. But in the real application, different products have different lifespan. The following is discuss the thermal management in led high bay . The key that matters the lifespan is thermal management. A well designed thermal management could be good to led high bay. One of the common thermal management is aluminum fin which is cheap and good adaptable at environment. Next thermal management is used the shape of the air convection. We make the special shape which will make the air convection.