Loading dock light sets come with dual light units so that one can be mounted on the exterior of the loading dock wall to inform truck drivers when to stay at the dock and when it is safe to pull away, and the other can be mounted inside the loading dock to inform workers when it is safe to enter the truck trailer. The system is controlled by a toggle switch located on the housing of the interior light. When the outside light is red then the inside light is green, increasing worker safety. The polypropylene housing will not rust, pit, dent or corrode and is IP54 certified for indoor or outdoor use. LED bulbs reduce energy costs, require no maintenance and have a longer life span than incandescent bulbs.