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metal halide lamp
A type of high-intensity discharge (HID) lamp in which most of the light is produced by radiation of metal halide (chemical compound of a halogen) and mercury vapors in the arc tube, similar in construction and appearance to mercury vapor lamps.
The addition of metal halide gases results in higher light output, more lumens (unit of luminous flux) per watt, and better color rendition than from mercury gas alone.