led high bay is often used in dusty or damp place with harsh environment. In order to make LED high bay reliable and work long term in those harsh environment, the design for its structure, shell and reflector are specially required. Sealed shell light or convection type light fixture with upward luminous flux are required in dusty place; while damp places require sealed shell and surface treatment on reflector. Generally LED Lights used in indoors is open-type flood light. Considering the inevitable vibration in production area, anti-disengaging socket is preferred for fixed light fixture.