Talk:Metal-halide lamp


 * 1) Halides are not metals.
 * 2) There's no such thing as the "halide group" (that would be the halogen group).  Any metal can be a halide.
 * 3) Metal halide lamps probably don't contain astatine (highly radioactive). --Smack (talk) 04:13, 19 July 2005 (UTC)


 * 1) AFAIK they're metals AND halides, not metals THAT ARE halides.
 * 2) Change it to think for the mean time.
 * 3) Removed "all" for the mean time.

Removing the accuracy tag for now. 68.39.174.91 08:38, 23 July 2005 (UTC)

hOW ABOUT SOME-THING ON THEIR HISTORY?

correlated color temperature
Changed references to color temperature to correlated color temperature. HID spectral output does not resemble black body emission, and apparent color does not lie on the Planckian locus. Chondrite 22:00, 6 August 2006 (UTC)

Phosphor
A "phosphor" is not used to diffuse light, but to convert a short wavelength (UV perhaps) into a longer (visible) wavelength.

are you Sure about that??....The spectrum produced by the Metal Halide Arc is White and has a Good CRI,why would it need Phosphorus??....they do make MH Lamps with Diffuse Coatings.

Phosphor is used to create a warmer color temp and to eliminate glare from the arc. 12.155.56.194 (talk) 18:20, 7 July 2009 (UTC)

Regulations
Suggest it be made clear (at the End of Life segment) that where these lamps are part of consumer electronics, like an LCD or DLP projector, that they are not "electronic waste" in most regulations in the United States, and should instead be disposed of as "universal waste."

Relevant links here: http://en.wikipedia.org/wiki/Universal_Waste http://www.epa.gov/epaoswer/hazwaste/recycle/electron/mce-fs.htm —Preceding unsigned comment added by 134.67.6.15 (talk) 23:25, 12 October 2007 (UTC)

Luminous efficacy
"About 24% of the energy used by metal halide lamps produces light (65-115 lm/W[1])"

The numbers in that sentence are a little contradicting. Which one is correct? —Preceding unsigned comment added by Victor van Poppelen (talk • contribs) 22:25, 28 October 2008 (UTC)

various
Hi, i have just finished to correct and format this article. Because my native language isn't english, can someone review this article for grammar issues? Thanks. P.S. who wrote this article without using an "enter" press? This article was simply unreadable!--Marcopete87 (talk) 20:01, 5 November 2009 (UTC)

Warm-up time
" They also require a warm-up period of several minutes to reach full light output,[2]"

No I believe they warm up fully within 30 seconds, at least in automotive applications. Perhaps large MH lamps require a longer warm-up time. The HID lamps in school gyms I believe are either high or low pressure sodium HID lamps which I think are the types that take minutes to warm up, but metal halide is the quickest type to warm up.

Perhaps more clarification in the introduction of this article would be helpful. — Preceding unsigned comment added by 184.76.47.120 (talk) 00:27, 14 July 2012 (UTC)

This short a warmup time is possible for some rather special HID lamps, such as automotive headlights, but this is not the case for general purpose metal-halide lamps (automotive lamps contain xenon at a non-negligible pressure even when cold, which makes it possible to reach a high light output under controlled overload conditions in a short time). Warmup times in the 2 to 5 minutes range are most common. The smallest miniature metal-halide lamps such as the Philips "CDM-Tm mini 20W GU6.5" have shorter warmup times, but still in the range of ca. one minute typical (3 minutes guaranteed maximum according to the datasheet). — Preceding unsigned comment added by 88.74.11.117 (talk) 18:34, 22 October 2012 (UTC)

HMI merger
HMI is just a sub-type of metal halide, a type of HID. I don't find that it justifies its own stand-alone page. Cantaloupe2 (talk) 20:11, 6 November 2012 (UTC)
 * I agree. -- Chetvorno TALK 11:12, 2 January 2013 (UTC)
 * Disagree - There is some duplication in HMI that could be removed, but HMI seems to be much higher power for cinema filming with different priorities eg spectra and colour matching and ballast design issues. Each article should refer to the other as appropriate. - Rod57 (talk) 15:05, 31 August 2015 (UTC)

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End-of-life controversy
There has recently been an edit war over addition of a paragraph that metal halide lamps exhibit cycling at end-of-life. The opposition said that this was mainly a behavior of high pressure sodium lamps, which have their own article. I looked up sources to try to resolve this: Some of these sources may lump HPS in with MH, however. From this I am not sure there is enough support to include in the article that MH lamps cycle. --ChetvornoTALK 19:00, 28 February 2022 (UTC)
 * Kane, Revolution in lamps, CRC press, 2001, p.148 MH lamps can cycle
 * Metal Halide Lamps, ChemEurope  MH can cycle
 * Coaton, Lamps and Lighting, 1997, p.309 MH shows "...a normal end of life failure mode where the lamp cycles..."
 * HID lamp service guide, Howard Lighting, p.11 had the clearest differentiation between MH and HPS, it says HPS show cycling but MH just exhibit "failure to start".