A metal-halide lamp is an electric light that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides (compounds of metals with bromine or iodine). They are members of the high-intensity discharge (HID) family of gas discharge lamps. Developed in the 1960s, they are similar to mercury vapor lamps, but contain additional metal compounds in the arc tube, which improve the efficiency and color rendition (whiteness) of the light. Metal-halide lamps have high luminous efficacy of around 75 - 100 lumens per watt average, about twice the efficiency of mercury vapor lights and 3 to 5 times that of incandescent lights, moderate bulb life (6,000 to 15,000 hours, a little shorter than mercury lamps) and produce an intense white light. 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. Like other HID lamps, they operate under high pressure (4 to 20 atmospheres) and require special fixtures to operate safely, as well as an electrical ballast. They also require a warm-up period of several minutes to reach full light output, so they are not typically used for residential room lighting, which is turned off and on frequently. - 80,000 initial lumens; 5,200 color temp; 65 CRI - Covers up to 6 square foot area - Places 12-24 inches above the plants - For use with 1000W MH ballasts only - 1 year warranty
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