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((refimprove|date=March 2017))
'''Hydrargyrum quartz iodide''' ('''HQI''') is a trademark name of [[Osram]]'s brand of [[metal halide lamp]]s<ref>((Cite web | url=https://trademarks.justia.com/732/70/hqi-73270632.html | title=HQI Trademark of OSRAM GMBH - Registration Number 1174073 - Serial Number 73270632 :: Justia Trademarks))</ref> made for general floodlighting, arena floodlighting, shop and commercial and industrial lighting. ''Hydrargyrum'' is the [[Latin]] name for the [[chemical element|element]] [[mercury (element)|mercury]].  When heated, [[mercury-vapor lamp|mercury vapour]] is created inside the lamp, and [[chemical deposition|deposit]]ed 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 containing [[argon]], mercury and [[metal halides]]. The lamp is powered by an [[electrical 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 high [[pressure]] and [[temperature]], and require special [[light fixture]]s for safe use.

HQI lamps can produce different [[color temperature]]s when manufactured with different [[metal]] [[halide]]s.  They are relatively efficient light sources producing a high lumen per watt ratio (approximately 6x that of incandescent lamps).

Like [[hydrargyrum medium-arc iodide|HMI]], HQI lamps are a subset (or type) of [[metal halide]] lamps, which in turn are a subset of [[high-intensity discharge]] (HID) lamps.  They should not be confused with [[Halogen lamp|halogen lamps]], which are a specialized type of [[Incandescent lamp#Halogen lamps|incandescent lamp]].

==References==
((Reflist))

==External links==

((Artificial light sources))

[[Category:Gas discharge lamps]]
[[Category:Metal halides]]


((Tech-stub))

[[fi:Monimetallilamppu]]

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