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Hydrargyrum quartz iodide (HQI) is a trademark name ofOsram's brand ofmetal halide lamps[1] made for general floodlighting, arena floodlighting, shop and commercial and industrial lighting.Hydrargyrum is theLatin name for theelementmercury. When heated,mercury vapour is created inside the lamp, anddeposited when it cools.
An HQI lamp consists of a protective outer glass shield surrounding two heavy wires which are inserted into each end of a smaller inner quartz arctube containingargon, mercury andmetal halides. The lamp is powered by anelectrical ballast, which regulates the current flow through the arc in the arctube, and an ignitor, to make the high voltage pulse that is necessary to start the arc in the arctube. Like all HID lamps, HQI lamps operate under highpressure andtemperature, and require speciallight fixtures for safe use.
HQI lamps can produce differentcolor temperatures when manufactured with differentmetalhalides. They are relatively efficient light sources producing a high lumen per watt ratio (approximately 6x that of incandescent lamps).
LikeHMI, HQI lamps are a subset (or type) ofmetal halide lamps, which in turn are a subset ofhigh-intensity discharge (HID) lamps. They should not be confused withhalogen lamps, which are a specialized type ofincandescent lamp.
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