Written by High Intensity Discharge Lamp (HID) is a general term for a mercury, metal-halide, or high-pressure sodium lamp.
HID lamps have a much higher luminous efficacy than fluorescent and incandescent lamps since a greater proportion of their radiation is visible light as opposed to heat.
A high intensity discharge light is an electrical lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube.
