Talk:Arc lamp

message: The term "arc lamp" seems a little generic to me; although it has a specific meaning in theatre parlance, it's also the generic term for a wide variety of lamp technologies.
Would anyone mind if we renamed this article to "Carbon arc lamp" and created a dab page at the old "Arc lamp" title?
Atlant 12:59, 16 May 2005 (UTC)
thread_title:  Title of the article 

message: I agree, and I probably should have read your comment before I edited the page and submitted my changes, but I'm new to this and I didn't see it.  Anyway, how should lamps be classified?  Is an "arc lamp" a general term for any lamp with an arc or is it just short for "carbon arc lamp"?  It's not clear to me if an "arc lamp" is a type of "gas discharge lamp" or the other way around.  I suppose the definitions are arbitrary.  Is there a conventional way that these terms are defined or classified?
Mikiemike 19:32, 3 April 2006 (UTC)
replies: text: In common usage the Arc lamp is always a Carbon arc lamp and the lamps you describe are Gas discharge lamps. There is duplication between the Arc lamp and Gas discharge lamp pages and it seems to me that they could be merged. As it stands, your edits seem to fit better on the Gas discharge lamp page, so if nobody likes the merge idea, perhaps the relevant edits could be moved to that page. Old Moonraker 23:51, 5 June 2006 (UTC)
replies: text: Added header to Carbon Arc Lamp section and noted that this is the one most commonly meant. Old Moonraker 06:50, 20 July 2006 (UTC)
replies: text:  I think the page should be renamed Carbon Arc Lamp, and the information on Arc Lamps should be moved to Gas dischage lamps. MisterSheik 14:21, 28 August 2006 (UTC)
replies: text: The "Carbon arc lamp" section is bigger than it used to be. Is it time to look at User:MisterSheik's suggestion again? --Old Moonraker (talk) 10:18, 18 November 2008 (UTC)
thread_title:  Re:Title of the article 

message: I need some help about solar radiation test IEC 60068-2-5
Which type of lamp to be used for this test???????
I need to perform SOLAR RADIATION TEST on Energy Meters
I need any specific type of lamp which can fulfill the test requirements
Please give your suggestions
~~~~AAMIR~~~~
:I think you'll find xenon arc lamps are usually used.
:Atlant 15:09, 1 September 2006 (UTC)
thread_title:  SOLAR RADIATION TEST 

message: I would think that there would be health dangers associated with electric arc lamps.  The arc itself is extremely bright, and can cause Arc Eye.  Would these old carbon arc lamps be powerful enough to cause this condition if looked directly at. Also, although minimal, electric arcs give off X-Rays.  In a place with a high concentration of arc- lamps, could this be a problem?? --Jdedmond 20:26, 22 March 2007 (UTC)
replies: text: Arc eye is not caused by the brightness of the arc but by the Ultra violet radiation such arcs give off.  This radiation can be blocked by a simple glass sheet. DieSwartzPunkt (talk) 16:49, 12 July 2012 (UTC)

text: Many hollywood film stars suffered permanent eye damage from the high intensity arc lamps that were required for technicolor cameras. DieSwartzPunkt (talk) 16:49, 12 July 2012 (UTC)
thread_title: Health Dangers?

message: This article needs to be rewritten by someone more familiar with writing and/or the English language.
97.113.109.15 (talk) 02:36, 6 February 2009 (UTC)
thread_title:  Rewrite 

message: I think that these lamps are not actually "arc" lamps, they rather use glow discharge.
I don't know if there's a strict boundary between low-power arc and hi-power
glow discharge, but I think an arc is somewhat hot (temperature > 300C), and 
hi-power (>50Amps), which is not the case in fluorescent lights.  —Preceding unsigned comment added by 77.45.233.7 (talk) 06:42, 21 August 2009 (UTC)
thread_title:  Fluorescent lamps 

message: The article mentions "cold restrike" lamps which can't start when they aren't cooled down. That's very curious but the article doesn't explain why. Why? Also, is this why my home projector puts its fan on full blast after shutting off the lamp? Is it trying to get the bulb cold fast so it can be restarted ASAP? —Ben FrantzDale (talk) 22:56, 15 February 2012 (UTC)
replies: text: That's a good question. I've never heard of lamps being designated as hot or cold restrike, (although the list of things-I've-never-heard-of could fill the encyclopedia Wikipedia). These terms are used often when talking about metal-vapor lamps; usually in terms of hot and cold restrike times. (ie: 2 minutes cold versus 10 minutes hot for a mercury bulb.) I know that most metal-vapor lamps can not restrike when hot. Striking is done with high-voltage, low-current power through the gas, until the solid or liquid metal vaporizes, at which point the main-driving current takes over. I'm also not sure why your projector fan would speed-up. If your arc lamp is mercury-xenon, then it may need extra cooling to quickly restrike. If it is xenon only, then temperture shouldn't affect restriking. It may simply be that the fan recieves a boost in voltage when the lamp is no longer drawing power. Someone else might be able to come along and give you a more informed answer. Zaereth (talk) 00:38, 16 February 2012 (UTC)
replies: text:  FWIW, metal-halide lamp mentions "restrike", suggesting that hot restrike requires a higher voltage ("Pulse-start metal-halide lamps don't contain a starting electrode, but they require an ignitor to generate a high-voltage (1–5 kV on cold strike, over 30 kV on hot restrike) pulse to start the arc."). I haven't studied why. As for the projector, I'm quite sure it's by design. It won't even let you turn the bulb back on while it's in the cool-down period. That said, being impatient I have unplugged it (causing it to forget its state), plugged it back in, and turned it on with no apparent issues. —Ben FrantzDale (talk) 14:30, 16 February 2012 (UTC)
replies: text: The usual barrier to restriking is that as the lamp heats up, the internal pressure rises, effectively increasing the strike voltage.  Thus the strike circuit cannot restrike the lamp until the internal pressure has dropped to the point where the strike voltage actually can cause the arc to strike. DieSwartzPunkt (talk) 16:53, 12 July 2012 (UTC)
thread_title:  Cold restrike 

message: Historically they were sometimes called the 'indivisible light' (eg Disenchanted night... p56) because they had a minimum brightness - but how bright are they ? 
... p55 says "thousands of candle powers". - Rod57 (talk) 12:28, 31 August 2015 (UTC)
replies: text: A_Dictionary_of_Electrical_Words_Terms_and_Phrases Vol 2. 1902 p568 says a 10 Amp, 45 Volt arc is 2000 candle power. - Rod57 (talk) 16:38, 31 August 2015 (UTC)
replies: text: According to Safety with Lasers and Other Optical Sources: A Comprehensive Handbook (2013) anywhere from 150 to 150000 candelas per square centimeter. Zaereth (talk) 01:52, 1 September 2015 (UTC)
thread_title:  How bright are carbon arc lamps 

message: The first carbon arcs used DC power from voltaic batteries - light mainly comes from pit on positive anode. See the 1902 ref above p568 
Carbon arcs drove the development of early dynamos and AC generators - need a more detailed timeline. Could say more about the different types of early carbon arc, and their regulators. - Rod57 (talk) 16:48, 31 August 2015 (UTC)
thread_title:  Need more history 

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thread_title:  External links modified 

message: Within the section "Carbon-arc lighting in the U.S." there is a source cited that spills over into the article itself instead of going under references. Should be a minor structure fix with the sources. Dalmationrotary (talk) 10:18, 11 November 2023 (UTC)
replies: text: Fixed. It was a simple matter of adding some ref tags. Zaereth (talk) 22:37, 14 November 2023 (UTC)
thread_title:  Citation within Carbon-arc lighting in the U.S.