We always think about the wattage as the first important factor for the lamp s. Since this autumn in American, the USA government chooses the brightness as the most important parameter in the led high baywhich makes the light efficiency and energy saving more influential. It is said that the USA trade federation submit a policy that the light efficiency should be the first place in the package instead of the wattage. Also the policy stipulates that the led energy consumption per year should be clear on the package. The other essential parameters are the lifespan of the lamps, brightness, color rendering and so on. Customers will choice the suitable led high bay from the parameters on the package.