A metal-halide lamp is an electric lamp that produces light by an electric arc through a gaseous mixture of vaporised mercury and metal halides. It is a type of high-intensity discharge (HID) gas discharge lamp.
Developed in the 1960s, they are similar to mercury vapor lamps, but contain additional metal halide compounds in the arc tube, which improve the efficacy and colour rendition of the light.
Metal-halide lamps have high luminous efficacy of around 75 – 110 lumens per watt, which is significantly greater than its predecessors. Lamp life ranges between 6,000 and 40,000 hours. They have been used for wide area overhead lighting of commercial, industrial, and public spaces, such as parking lots, sports arenas, factories, and retail stores, as well as automotive headlamps (xenon headlights).
The lamps consist of a small fused quartz or ceramic arc tube which contains the gases and the arc, enclosed inside a larger glass bulb which has a coating to filter out the ultraviolet light produced. They operate at a pressure between 4 to 20 atms, and require special fixtures to operate safely, as well as an electrical ballast. Metal atoms produce most of the light output. They require a warm-up period of several minutes to reach full light output.
Advanced Lighting Technologies NZ Ltd offer metal halide options in the Venture and Ruud brands of high-bays, low-bays, canopy lights, as well as flood and area lighting.
For Venture Metal Halide Lamp details – www.venturelighting.co.nz