High Bay Lighting is a term generally used to describe indoor lights that are commonly mounted via a pendant or directly to a girder.  High Bay Fixtures are generally used in warehouses, factories and industrial applications where a good spread of light is needed.

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Round high bays,commonly referred to as UFO high bays are used for general lighting areas, where there are open spaces and a good spread of light is required.

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Linear high bays are more specialized than the UFO high bays as these are designed for warehouses with racking and narrower areas that need to be lit effectively with a controlled beam angle.