Talk:Mercury-vapor lamp

message: :Whoever added the visible spectrum to the right of the page, please consider replacing it with a (high pressure) mercury vapor spectrum. The spectrum added is that of a triphoshor fluorescent and that is a LOW pressure mercury vapor lamp. Not typical of mercury vapor lamps, which are high pressure.
The spectrum has been replaced to a version with several lines (so probably high pressure), but it still does not correspond to what is expected from the atomic emission spectrum of Mercury. Usually the positions that are given for the Mercury lines are: 
* 435.835 nm (blue)
* 546.074 nm (green), 
* a pair at 576.959 nm and 579.065 nm (yellow-orange). 
(There are two other blue lines at 404.656 nm and 407.781 nm and a weak line at 491.604 nm.) 
This last part is copied from http://hyperphysics.phy-astr.gsu.edu/hbase/quantum/atspect2.html#c2. FraWa (talk) 11:08, 9 February 2011 (UTC)
replies: text: I agree. The very typical green line at 546 nanometer is missing in :File:Mercury Vapour Lamp Spectrum.jpg. I will remove it from the article. /Pieter Kuiper (talk) 09:07, 30 September 2011 (UTC)
thread_title:  Spectrum on page not representative of mercury vapor lamp 

message: It is written that "The mercury vapor lamp is a negative resistance device and requires auxiliary components (for example, a ballast) to prevent it from taking excessive current". Why does it takes 'excessive current' in the negative resistance regeion. —The preceding unsigned comment was added by 59.94.115.159 (talk • contribs) .
:Have you read the article about negative resistance? But in brief:
:* For an ordinary resistance, the resistance of the device doesn't change so current flow through the resistance only rises in proportion to the voltage across the device. If the voltage is limited, so will the current flow be limited.
:* For a negative resistance device, though, as more current flows through the device, its resistance decreases. If connected to a fixed voltage source, this reduced resistance allows more current to flow which further reduces the device's resistance which allows more current to flow until... POOF!
:In gas discharge lamps like the mercury vapor lamp, the negative resistance occurs because, as more current flows, there are more current-conducting ions formed in the gas column, decreasing the resistance...
:Atlant 15:44, 9 October 2006 (UTC)
thread_title:  How is that 

message: This page needs a picture to show people what these lamps usually look like, and what their color is. If anyone could get that, it would be great. I will also try to get a picture. E.boyer7 22:57, 2 January 2007 (UTC)
thread_title:  Picture? 

message: In my opinion is wrong: cycling is the end of life behaviour of high pressure sodium lamps.
The cycling is produced by the high voltage ignitor that try to restart the arc in the lamp: traditional mercury vapour lamps have only internal starting electrodes and an external magnetic ballast, they start at mains voltage.
Mercury lamps suffers from blackening of the quartz discharge tube as they age from evaporation of the emitting coating of the electrodes: the lamp never really burns out, it just gets fainter and fainter but is still burning.
After many many years some lamps simply went out because the emitting layer on the tungsten electrodes is totally depleted and the electrode is no longer capable to emit enough electrons to sustain the discharge.  —Preceding unsigned comment added by 151.28.6.30 (talk) 01:07, 9 September 2007 (UTC)
thread_title:  End of life Section 

message: A statement was recently added that claims that mercury lamps use more than double the power at end of life.  My understanding has been that the power consumption stays roughly the same while light output drops substantially.  Does anyone happen to know of any reliable sources on this subject? Travis Evans (talk) 06:59, 25 January 2014 (UTC)
thread_title:  Power consumption 

message: I think that the heading should be changed to "High pressure Mercury-vapour lamp". Am I wrong or isn't Mercury-vapour lamp sort of general? You could say that a fluorescent lamp is also a sort of Mercury-vapour lamp. DesertDiver (talk) 17:03, 26 February 2008 (UTC)
replies: text: Fluorescent tubes require the use of the outer phosphor coating (If I learned correctly), whereas these don't, so a fluorescent tube would be something like a "mercury-excited phosphor lamp" or something. That being said, I think they are nearly universally referred to as "mercury vapors", so we just follow the most common name. 68.39.174.238 (talk) 00:03, 26 April 2008 (UTC)
thread_title:  Changing the Title of the article 

message: http://archpedi.ama-assn.org/cgi/content/abstract/158/4/372?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=high-intensity+lamp&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT
This one has full text for free. 68.39.174.238 (talk) 00:04, 26 April 2008 (UTC)
thread_title:  A new example 

message: It looks like that mention of 'brasso' is basically just an ad.  —Preceding unsigned comment added by 75.83.15.201 (talk) 07:27, 27 May 2008 (UTC)
thread_title:  Spam 

message: i would like to post Pics that i've taken of These Lamps to show how they look when lit,but i dont know how.(Edit&Post (talk) 18:49, 1 May 2009 (UTC)
thread_title:  Pictures of Lamps 

message: The current version has this:
:=== Variation: Metal halide ===
:A closely-related lamp design called the metal halide lamp uses various compounds in an amalgam with the mercury. Sodium iodide and Scandium iodide are commonly in use.
According to amalgam, "An amalgam is a substance formed by the reaction of some other substance with mercury." But in that article, every example of an amalgam is with a single element, except ammonium amalgam. Ammonium, like metals, forms compounds as a postive ion. There are no examples offered of amalgams with a compound. But this article implies that there is such a thing as sodium iodide amalgam. I am not a chemist, but I suspect that there is no such a thing as sodium iodide amalgam or scandium iodide amalgam. If I'm right, this section should be rewritten to clarify that it's not sodium iodide amalgam. If I'm wrong, the amalgam article should give an example of a compound amalgam, such as sodium iodide amalgam. Anomalocaris (talk) 07:10, 24 December 2009 (UTC)
thread_title:  Metal halide amalgam? 

message: I don't believe this. I used to work at a steel mill, and we'd installed mercury vapor lamps on a scrap loading crane (the MV lamps ran OK on 250 V DC, though we had to order a bulb with a low enough strike voltage, and of course resistor ballasts)- I'm quite sure those lamps saw a *lot* more vibration than anything even the most energetic hooligan could impart to a street lamp pole, and I don't recall ever seeing them "shaken" out even when the operator of the crane was systematically trying to knock down the building with the magnet. --Wtshymanski (talk) 14:14, 23 February 2010 (UTC)
thread_title: Kicking off a lamp?

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thread_title:  External links modified 

message: does this need a page mentioning the theories concerning ancient Egyptian flourescent lighting? Aside from the theories about pyramids harvesting static electricity, transmitted via long-ago-stolen gold cables, there's that infamous carving of what look like light bulbs, and the anecdote about glass columns that initially glowed when discovered by an archaeologist, who broke one and found mercury in it.
That is, were one to set up a mercury vacuum with a Sprengel pump, and put it near static electricity, does it glow? Did it glow in ancient Egypt? 65.118.97.26 (talk) 16:47, 8 May 2019 (UTC)
replies: text: No. Articles are about their subjects.  --Wtshymanski (talk) 19:14, 8 May 2019 (UTC)

text: Ever since the Victorian era there have been romantic cults of gullible Western people that have been fascinated by the "mysteries of Ancient Egypt", and all sorts of unqualified people promote themselves as "Egyptian experts".  There is an echo chamber of WP:FRINGE WP:PSEUDOSCIENCE fanboy websites promoting wild speculation that ancient Egyptians had all sorts of modern technology.  In the unlikely case that there is enough responsible support for this in reliable archeological journals, the place for it would be the article Ancient Egyptian technology.  --ChetvornoTALK 19:35, 8 May 2019 (UTC)
thread_title:  Ancient Egyptians 

message: The article claims "Mercury vapor lamps are becoming obsolete due to the higher efficiency and better color balance of metal halide lamps." but cites a 2012 reference.  In the intervening 8 years LED lamps seem to have taken over from the far less efficient halid lamps.  Comments?  Vaughan Pratt (talk) 07:18, 29 February 2020 (UTC)
thread_title:  Dated article?