Metal halide lamps is a type of high intensity discharge lamp. Metal halide lamps have an efficiency of 75-100 lumens per watt (which is similar to LED lighting), and possess a moderately long bulb life (6,000 hours to 15,000 hours).
Metal-halide lamps are used for both general lighting purposes, as well as automotive and specialty applications, or where a high intensity light source is needed as they produce an intense white light. Because of their wide spectrum, they are used for indoor growing applications, in athletic facilities and are quite popular with reef aquarists, who need a high intensity light source for their corals.
Metal-halide lamps are used in automobile headlights, where they are commonly known as "xenon headlamps" due to the use of xenon gas in the bulb, instead of the argon typically used in other halide lamps. They produce a more intense light than incandescent headlights.
It’s worth mentioning that metal halide bulbs require electrical ballasts to limit the arc's current - otherwise the bulb destroys itself.
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