Because of the unique lighting principle, led high bay is far more superior to traditional high pressure sodium lamp at the same price. E-lite Semiconductor use chips from international famous brands with the guarantee period as long as five years. We can say that our lights can last for at least five years. In the aging test, our lights have only a 30% luminous decay after three years of usage. Moreover, LED Lights are more clean and environmentally friendly than traditional lights since no harmful material would be generated.