Ceramic metal-halide lamp: Difference between revisions
Rv. This article was titled Ceramic discharge metal-halide lamp until a hot minute ago, and that term still redirects here. Light Emitting Ceramic also redirects here, and so should be listed and in boldface per WP:MOSBOLD. Whether these terms are trademarks is completely irrelevant. Your revert also seems to have blindly taken out several other changes. |
Undid revision 1084714664 by Srleffler (talk): There was a reason why I moved that article to its current name: The former name was wrong and invented by Wikipedia. I ask you to delete the redirection of Ceramic discharge metal-halide lamp |
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[[File:G12 metal halide light bulb.JPG|thumb|Ceramic metal halide bulb with G12 socket]] |
[[File:G12 metal halide light bulb.JPG|thumb|Ceramic metal halide bulb with G12 socket]] |
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The '''ceramic metal halide lamp''' ('''CMH''') is a source of light that is a type of [[metal-halide lamp]] which is 10-20% more efficient than the traditional quartz metal halide<ref>{{Cite book|title = Energy Management Handbook|url = https://books.google.com/books?id=QxKyRigx6CoC|publisher = The Fairmont Press, Inc.|date = 2007-01-01|isbn = 9780881735437|first = Wayne C.|last = Turner|first2 = Steve|last2 = Doty|pages = 376}}</ref> and produces a superior [[Color rendering index|color rendition]] (80-96 CRI).<ref>{{Cite web|title = Ceramic Metal Halide Lighting Basics - Lumenistics|url = http://lumenistics.com/ceramic-metal-halide-lighting-basics/|website = Lumenistics|publisher = Lumenistics|access-date = 2015-12-29|language = en-US}}</ref> |
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Applications for these lamps |
Applications for these lamps shop lighting, street lighting, architectural [[lighting]] and agricultural lighting including [[grow light]]s. A CMH light was first exhibited by the Thorn Lighting Group in 1981 at the Hannover World Light Fair, and the first commercial CMH lamps were distributed by [[Philips]] in 1994. |
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The term " |
The term "Light Emitting Ceramic" or "LEC" is sometimes improperly used to describe ceramic metal-halide grow lights in general, though that term is actually the registered trademark of a specific brand of ceramic metal halide light.<ref>{{Cite web|url=https://www.roguehydro.com/pages/grow-light-buyers-guide|title=Grow Light Guide - Learn to Grow MH HPS LED CMH & More!|website=Rogue Hydro|access-date=2016-10-14}}</ref><ref>{{Cite web|url=http://www.growersc.com/resources|title=Growers Choice|website=Growers Choice|access-date=2016-10-14}}</ref><ref>{{Cite news|url=http://indoorgardens.com/node/41|title=LEC / CMH Grow Lights|last=admin|date=2013-01-07|newspaper=Indoor Gardens|language=en|access-date=2016-10-14}}</ref><ref>{{Cite news|url=http://hydrobuilder.com/learn/the-best-grow-light-for-your-grow-tent/|title=The Best Grow Light For Your Grow Tent|date=2016-06-16|newspaper=Hydrobuilder Learning Center|language=en-US|access-date=2016-10-14}}</ref> |
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== Operation == |
== Operation == |
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==See also== |
==See also== |
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* [[List of light sources]] |
* [[List of light sources]] |
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* [[Grow light]]s |
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==References== |
==References== |
Revision as of 06:53, 26 April 2022
The ceramic metal halide lamp (CMH) is a source of light that is a type of metal-halide lamp which is 10-20% more efficient than the traditional quartz metal halide[1] and produces a superior color rendition (80-96 CRI).[2]
Applications for these lamps shop lighting, street lighting, architectural lighting and agricultural lighting including grow lights. A CMH light was first exhibited by the Thorn Lighting Group in 1981 at the Hannover World Light Fair, and the first commercial CMH lamps were distributed by Philips in 1994.
The term "Light Emitting Ceramic" or "LEC" is sometimes improperly used to describe ceramic metal-halide grow lights in general, though that term is actually the registered trademark of a specific brand of ceramic metal halide light.[3][4][5][6]
Operation
The ceramic metal halide is a variation of the metal-halide lamp which is itself a variation of the old (high-pressure) mercury-vapor lamp. A CMH uses a ceramic arc tube instead of the fused quartz arc tube of a traditional metal halide lamp. Ceramic arc tubes allow higher arc tube temperatures, which some manufacturers claim results in better efficacy, color rendering, and color stability.[7]
The discharge is contained in a ceramic tube, usually made of sintered alumina, similar to that used in the high pressure sodium lamp. During operation, the temperature of this ceramic tube can exceed 1200 kelvins. The ceramic tube is filled with mercury, argon and metal-halide salts (for example, sodium iodide). Because of the high wall temperature, the metal halide salts are partly vaporized. Inside the hot plasma, these salts are dissociated into metallic atoms and iodine.
The metallic atoms are the main source of light in these lamps, creating a white light with a CRI (color rendering index) of up to 96. The exact correlated color temperature and CRI depend on the specific mixture of metal halide salts. There are also warm-white CMH lamps, with somewhat lower CRI (78-82) which still give a more clear and natural-looking light than the old mercury-vapour and sodium-vapour lamps when used as street lights, besides being more economical to use.
The ceramic tube is an advantage in comparison to earlier fused quartz. During operation, at high temperature and radiant flux, metal ions tend to penetrate the silica, depleting the inside of the tube. Alumina is not prone to this effect.
CMH lights have a long life of up to 24,000 hours.[8]
Efficacy
Ceramic metal halide lamps use one fifth of the power of comparable tungsten incandescent light bulbs for the same light output (80–117 lm/W) and retain color stability better than most other gas discharge lamps. Like other high-intensity discharge lamps, they require a correctly rated electrical ballast in order to operate.
See also
References
- ^ Turner, Wayne C.; Doty, Steve (2007-01-01). Energy Management Handbook. The Fairmont Press, Inc. p. 376. ISBN 9780881735437.
- ^ "Ceramic Metal Halide Lighting Basics - Lumenistics". Lumenistics. Lumenistics. Retrieved 2015-12-29.
- ^ "Grow Light Guide - Learn to Grow MH HPS LED CMH & More!". Rogue Hydro. Retrieved 2016-10-14.
- ^ "Growers Choice". Growers Choice. Retrieved 2016-10-14.
- ^ admin (2013-01-07). "LEC / CMH Grow Lights". Indoor Gardens. Retrieved 2016-10-14.
- ^ "The Best Grow Light For Your Grow Tent". Hydrobuilder Learning Center. 2016-06-16. Retrieved 2016-10-14.
- ^ "Quartz and ceramic arc tube differences | Mid-Wattage Metal Halide | Lighting Answers | NLPIP". www.lrc.rpi.edu. Retrieved 2015-12-29.
- ^ "Ceramic Metal Halide (CMH) | HID Lights | HIDs". GE Lighting North America. Archived from the original on 2015-11-01. Retrieved 2015-12-29.