UFO LED high-bay light is a device which are consist of die-cast aluminum alloy heat-sink, PC optical lens, LED light source model and diver. It can be a replacement of HID and other traditional light fixture, provided with higher efficacy, a longer lifetime 50,000H at least or even more up to 100,000H but very lower breakdown opportunity, higher reliability and better cost than before, lower output voltage 60Vdc means safety for use. It provides different light distribution angle by optical lens without reflector.