Laser safety was a good articles nominee, but did not meet the good article criteria at the time. There may be suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake. | ||||||||||
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This article is rated B-class on Wikipedia's
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Looking through the Laser ratings, the article seems to missing a great deal of information on power ratings for the various types of lasers and operating parameters
Missing info:
Class 1 max power output (MPE value?)
Class 1B max power output (MPE value?)
Class 3R max power output (pulsed visible, pulsed and non-pulsed non-visible)
Class 3B max power output (non-pulsed visible, and pulsed non-visible)
Class 4 min power output (dependent upon class 3 ratings)
68.0.234.210 ( talk) 14:04, 1 September 2011 (UTC)
There seems to be considerable disagreement on reasonable safety guidelines. The initial version of this article seemed to justify (or try to justify) practices which include systematic breaching of laser safety regulations. In particular, it was considered safe to routinely work without safety glasses, even when dealing with class-IV lasers, provided that some guidelines are followed. Surely such practices would be allowed by safety regulations if it could be convincingly shown that they are safe. However, for many reasons (some of which are now given in the modified article), they are not safe. A former colleague of mine worked exactly in this style (no glasses, but keep out of the experimental plane) with a 500-mW Nd:YAG laser. He was later told by a doctor that peripheral regions of both his retinas are burned. He had not noticed that, but with somewhat less luck it could have hit the central portion of the retina, blinding him for ever. He then changed his style; at earlier times, I had been unable to convince him to use his glasses.
Even though most laser operators have probably at least sometimes breached some safety regulations, there is an important difference between occassionally breaching a rule oneself and publicly recommending such breaches to others as allegedly reasonable practices. The latter can hardly be considered responsible. Therefore, I strongly recommend not to return to a relaxed version before laser safety experts can be convinced to include such practices into official rules and guidelines.
RPaschotta 13:38, 30 Oct 2004 (UTC)
I do not believe the picture "Green laser – class IIIb compared to class IIIa" has any meaning compared to the issue of safety and should be removed. It contributes nothing of value to the topic. Prof Gall 22:14, 14 April 2010 (UTC) —Preceding unsigned comment added by ProfGall ( talk • contribs)
I think that after your edit, the article is reasonably NPOV, discussing both common practice and objections against it. (As opposed to earlier versions that could be read as promoting dangerous behaviour and then as moralizing).
By the way, I think most operators are actually more careful with class 4 lasers. I haven't found a table that lists the exact tresholds for the different classes at various wavelengths, but the treshold for class 4 seems to be around 500 mW. Diffuse reflections from pieces of paper with 500 mW visible light are definitely unpleasant to have within your field of view -- and likely harmful as well, so people tend to be more careful with those.
More philosophically, one could wonder where one should put the boundary between acceptable and unacceptable risks. The chance of dying from head injury is about the same for an hour of car driving as for an hour of cycling (quite low compared to other risks in either case). However, few find it reasonable to recommend helmets to car drivers. Laser accidents happen, but are not very common, and I have not heard about anyone who actually completely lost sight in an eye. The worst I know of is someone who damaged 30% of the central view area of one eye due to a reflection from a mixing crystal.
Han-Kwang (talk) 15:54, 30 Oct 2004 (UTC)
It appears to me that the recommendations made in 2004 have not been implemented. The text still appears to condone unsafe behavior. Eyewear must be worn when engineering or other controls are inadequate to eliminate the potential exposure in excess of the applicable MPE. There have been dramatic improvements in eyewear coatings in the past few years. Eyewear can now be tailored to block only the harmful wavelengths produced by a given laser. The eyewear is also lightweight and comfortable, so the old excuses no longer apply. In the US, your employer is mandated by law to provide you with the safety equipment mandated by the ANSI Z136.1-2000 standard. In the case of Class 4 lasers, this applies to the purchase of eyewear, signage, viewing aids and laser access control systems.
1sciguy 18:25, 6 April 2007 (UTC)
It says most laser pointers are class II. Where's the evidence for this? They're class IIIa or IIIb. Class II lasers have minimal output intensity, like that from an LED. Also see my counterclaims at Talk:Laser. lysdexia 21:25, 21 Dec 2004 (UTC)
Blink reflex does not work when you look at sun behind a curtain. It also applies when we exposed to a laser behind a curtain however, it is still dangerous it will burn points where the picture of light holes focus in the retina. All fabric curtains have these direct holes. -- Mahdig 31 October 2006 (UTC)
I still have no clue what you are talking about. I see that you created an article Cutains and The blinking reflex containing the above comment. I strongly suggest that you add a diagram, remove the two spelling errors in the article, and add some context. As the new article is now it is non-encyclopedic and a very likely candidate for WP:AFD. Also please remember WP:NOR. Han-Kwang 14:42, 1 November 2006 (UTC)
I'd say that this article definately needs an A-class or at least a GA-class rating on the assesment scale. I have nominated it for one of these ratings. G man yo 09:55, 28 February 2007 (UTC)
Unfortunately I have failed this article as there are a few areas in which I would like to bring to attention to the editors of this article in order to hepefully bring it up to standaeds in the future.
If this article was improved in the ways mentioned above and any other areas in which editors bring to attention then it may pass in future months/weeks. Telly addict 13:00, 3 March 2007 (UTC)
Anything authoritative on this issue?
Which makes the whole section a copyvio... ed g2s • talk 13:30, 9 August 2007 (UTC)
The Class 1 and Class I limits are clearly stated in the abstract ==> laser exposure may not exceed the MPE. However, while Class 2 and Class II limits are correctly expressed the for *visible* light (which Class 2 and II are specific to) Class 3x and Class IIIx and higher classifications continue to assume visible light. For instance, I work with lasers which regularly emit powers greater than 10 mW but which are still Class 1 - according to this page they would only possibly be Class 3b and Class IIIb due to the clear statement for each that lasers emitting greater than 5 mW radiation are such. There is also a serious problem with an earlier statement (section titled Classification) that the relevant units for MPE are W or J, and switch to W/m^2 at wavelengths greater than 4 um. This is just wrong. The relevant units are always, specifically, radiant exposure (in J/cm^2) or irradiance (in W/cm^2) for both MPE evaluation and classification. Statements like, "output may not exceed 5 mW" are rules of thumb for point-source lasers (in this case for visible Class IIIa lasers) which have implicit assumptions about beam diameter, ocular aperture, aversion response time, etc. built in. Looking first for response. If I have time perhaps I'll try to improve this. 64.32.245.242mjd 2007-10-29 16:42 EDT
I removed this: **When picking up something from the floor, closing the eye may not give sufficient protection against multi-watt laser beams, as the eye's lid is partially transparent, particularly for infrared light. Closing both eyes when kneeling becomes second nature and automatic for workers in such fields.. Not only is the remark about the second nature a bit strange, but also the first part is not correct. Although the eyelid may not absorb near-IR light, it still scatters the laser light which prevents the light from being focused onto the retina. Of course, a 10 W beam with a 3 mm diameter will probably burn the eyelid and possibly damage the cornea underneath as well, but this is not a very likely situation in a research lab, where the smell of burning clothes, skin, and wall painting would have drawn attention before. Han-Kwang ( t) 22:24, 1 November 2007 (UTC)
I suggest to insert the following additional reference, which is a page of my own "Encyclopedia of Laser Physics and Technology": article on laser safety in the Encyclopedia of Laser Physics and Technology
RPaschotta 16:34, 5 Nov 2007 (UTC)
Regarding these edits, I think I agree with Pzavon, both on how a class 4 laser can damage skin and on the suitability of therapy lasers for this article (i.e., not suitable). Therapy laser treatment seems to be an interesting topic though, that would probably be suitable for an article of its own with a bit more background on what kind of medical conditions this laser treatment would deal with. Han-Kwang ( t) 00:46, 16 December 2007 (UTC)
I think the sections on the old and new classifications should be merged. Most of the specifications overlap. I think there should be a small intro about the differences between the schemes, and then Class 1/I can be discussed together. IN the current version there's too much duplicate info. Han-Kwang ( t) 18:01, 12 February 2008 (UTC)
I will think about how to combine some text. The problem is that I am not familiar with the details of the old system to really be able to give an overview of the philosophies behind the two systems.
Something else: your recent edit summary: The definition of Class 4 is based upon determinations of what will damage skin. I looked it up, thinking that it was "skin damage OR dangerous diffuse reflectios", but indeed, The IEC standard says about class 4: "...for which intrabeam viewing and skin exposure is hazardous and for which the viewing of diffuse reflections may be hazardous. (emphasis added) Apparently, also from the description of class 3B, a laser can be dangerous in diffuse reflections without causing skin damage, and vice versa. I'll clarify this. Han-Kwang ( t) 13:05, 13 February 2008 (UTC)
The "old system" (quotes from article) has no information about when that classification system was in use, nor when the classification scheme changed. It also has a very old citation needed tag. The section should be fixed or removed. 134.29.231.11 ( talk) 17:36, 24 February 2011 (UTC)
This illustration of a label claims that eye damage could result if a Class 2 beam is directed at the eye for more than 10 seconds. such a label seems "off" to me. I am not aware of any labels containing explicit time limits. Can anyone really familiar with practice in the EU say whether such a label is actually in wide use? Pzavon ( talk) 23:42, 16 March 2008 (UTC)
I have edited the laser pointer section to reflect that, although red laser pointers appear to be safe and this shouldn't be denied, the overall tone of the article should still emphasise laser safety and the dangers of lasers in general. The paragraph removed consisted solely of an implication that people who complained over laser pointer exposure were liars, fraudsters or crybabies, which isn't too value adding above a simple statement of the fact that damage is unlikely to occur. 217.154.66.11 ( talk) 19:41, 14 April 2008 (UTC)
I just rewrote the section about conventional practice in research labs because I felt it was too much POV-, essay- and howto-like. Unfortunately, this is a subject that everybody who works in this area seems to know, but nobody writes down, probably because of legal consequences, so it still looks a bit like original research. I know many people who have had laser-related eye injury in a lab. The worst case is someone who damaged 30% of one fovea, meaning he can't use that eye for reading. And then there are many people who have a small burn. I did once have the opportunity to visit the R&D department in a laser factory, and the procedures were pretty similar to what I've seen in many university labs (goggles are available but only worn during very specific high-risk procedures). Any suggestions for references? Han-Kwang ( t) 18:07, 6 July 2008 (UTC)
Now, I'm no expert, but the reasons for this article failing at getting "good article" status seem to have been fixed. "Laser Safety" in bold is the first phrase in the whole article, there seem to be alot of links to other articles, the classes and class levels are now sections, and it has 7 categories. G man yo ( talk) 11:41, 2 November 2008 (UTC)
Okay, I've re-decided, this article is not necessarily a "good article" yet, however has the potential to soon be. It needs more sources cited inside of the text, and it needs to cover a couple more topics in the lead, even if just briefly (such as protective eyewear). If these things are fixed, then I think it could pass. G man yo ( talk) 14:50, 10 November 2008 (UTC)
I would like to see a few changes before considering this a "good article":
I can work on some of this, but unfortunately don't have access to the actual regulations to be able to know I'm being complete and to give references. The Photon ( talk) 03:21, 12 November 2008 (UTC)
Since glasses and contact lenses are meant to focus light, do they increase the damage by lasers to the retina? I heard someone one time wearing contact lenses the she was more sensitive to daylight light when she first put them on. 70.79.50.5 ( talk) 09:03, 7 May 2010 (UTC)BeeCier
It seems that the class of a laser product can be lower than the class of the laser it contains (e.g. a DVD burner is a class 1 laser product but IIRC tends to contain a class 3b laser). Does anyone have any more details on this? 86.1.116.158 ( talk) 07:20, 15 June 2010 (UTC)
Can someone comment on the following label found (on of all things) a weather forcasting gadget.
It shows the laser hazard symbol (as at the head of the article) with the following words.
CAUTION LED RADIATION CLASS 2 LED PRODUCT POWER: <100MW WAVELENGTH: 470 nm
The product has 3 LEDs on it but the label seems to apply only to the blue one. I assume that the power should have read "<100mW" as a 100Megawatt blue LED is going to take a heck of lot of power to drive it. It seems odd to put such a label on a product where the blue LED is positioned such that it's only purpose is to be seen. AFAICT, there are no lasers in it whatsoever. DieSwartzPunkt ( talk) 14:43, 17 February 2011 (UTC)
I don't think the old and new system headings need subheadings for each class within them. They should probably be consolidated, most notably the old system. The Photon mentioned this in an earlier section. In fact, the organization of the entire article is rather arbitrary. It seems like things could be grouped better and reorganized. G man yo ( talk) 07:35, 27 January 2012 (UTC)
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Someone pointed out (over email, after 11 years) that there was an error in File:IEC60825 MPE J nm.png in the wavelength range 315-400 nm for exposure times > 1 ns. I have corrected the plot. I'm posting it here so that editors watching this page are aware of the change. Han-Kwang ( t) 10:55, 17 October 2018 (UTC)
Indirect laser light can damage camera sensors: https://www.reddit.com/r/photography/comments/ayua7d/tip_dont_record_laser_tattoo_removal/?limit=500 -- 94.21.11.150 ( talk) 19:08, 10 March 2019 (UTC)
Class 4 should be renamed to class 4a.
class 4b: Small part reflections, like dust, which still looked fairly dim at 460 milliwatts, are the next eye hazard.
class 5: The beam's appearance from the side in clean dry air, which still looked dim at 5.5 watts, is the last eye hazard. 94.31.84.138 ( talk) 19:34, 21 April 2024 (UTC)
Laser safety was a good articles nominee, but did not meet the good article criteria at the time. There may be suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake. | ||||||||||
|
This article is rated B-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||
|
Looking through the Laser ratings, the article seems to missing a great deal of information on power ratings for the various types of lasers and operating parameters
Missing info:
Class 1 max power output (MPE value?)
Class 1B max power output (MPE value?)
Class 3R max power output (pulsed visible, pulsed and non-pulsed non-visible)
Class 3B max power output (non-pulsed visible, and pulsed non-visible)
Class 4 min power output (dependent upon class 3 ratings)
68.0.234.210 ( talk) 14:04, 1 September 2011 (UTC)
There seems to be considerable disagreement on reasonable safety guidelines. The initial version of this article seemed to justify (or try to justify) practices which include systematic breaching of laser safety regulations. In particular, it was considered safe to routinely work without safety glasses, even when dealing with class-IV lasers, provided that some guidelines are followed. Surely such practices would be allowed by safety regulations if it could be convincingly shown that they are safe. However, for many reasons (some of which are now given in the modified article), they are not safe. A former colleague of mine worked exactly in this style (no glasses, but keep out of the experimental plane) with a 500-mW Nd:YAG laser. He was later told by a doctor that peripheral regions of both his retinas are burned. He had not noticed that, but with somewhat less luck it could have hit the central portion of the retina, blinding him for ever. He then changed his style; at earlier times, I had been unable to convince him to use his glasses.
Even though most laser operators have probably at least sometimes breached some safety regulations, there is an important difference between occassionally breaching a rule oneself and publicly recommending such breaches to others as allegedly reasonable practices. The latter can hardly be considered responsible. Therefore, I strongly recommend not to return to a relaxed version before laser safety experts can be convinced to include such practices into official rules and guidelines.
RPaschotta 13:38, 30 Oct 2004 (UTC)
I do not believe the picture "Green laser – class IIIb compared to class IIIa" has any meaning compared to the issue of safety and should be removed. It contributes nothing of value to the topic. Prof Gall 22:14, 14 April 2010 (UTC) —Preceding unsigned comment added by ProfGall ( talk • contribs)
I think that after your edit, the article is reasonably NPOV, discussing both common practice and objections against it. (As opposed to earlier versions that could be read as promoting dangerous behaviour and then as moralizing).
By the way, I think most operators are actually more careful with class 4 lasers. I haven't found a table that lists the exact tresholds for the different classes at various wavelengths, but the treshold for class 4 seems to be around 500 mW. Diffuse reflections from pieces of paper with 500 mW visible light are definitely unpleasant to have within your field of view -- and likely harmful as well, so people tend to be more careful with those.
More philosophically, one could wonder where one should put the boundary between acceptable and unacceptable risks. The chance of dying from head injury is about the same for an hour of car driving as for an hour of cycling (quite low compared to other risks in either case). However, few find it reasonable to recommend helmets to car drivers. Laser accidents happen, but are not very common, and I have not heard about anyone who actually completely lost sight in an eye. The worst I know of is someone who damaged 30% of the central view area of one eye due to a reflection from a mixing crystal.
Han-Kwang (talk) 15:54, 30 Oct 2004 (UTC)
It appears to me that the recommendations made in 2004 have not been implemented. The text still appears to condone unsafe behavior. Eyewear must be worn when engineering or other controls are inadequate to eliminate the potential exposure in excess of the applicable MPE. There have been dramatic improvements in eyewear coatings in the past few years. Eyewear can now be tailored to block only the harmful wavelengths produced by a given laser. The eyewear is also lightweight and comfortable, so the old excuses no longer apply. In the US, your employer is mandated by law to provide you with the safety equipment mandated by the ANSI Z136.1-2000 standard. In the case of Class 4 lasers, this applies to the purchase of eyewear, signage, viewing aids and laser access control systems.
1sciguy 18:25, 6 April 2007 (UTC)
It says most laser pointers are class II. Where's the evidence for this? They're class IIIa or IIIb. Class II lasers have minimal output intensity, like that from an LED. Also see my counterclaims at Talk:Laser. lysdexia 21:25, 21 Dec 2004 (UTC)
Blink reflex does not work when you look at sun behind a curtain. It also applies when we exposed to a laser behind a curtain however, it is still dangerous it will burn points where the picture of light holes focus in the retina. All fabric curtains have these direct holes. -- Mahdig 31 October 2006 (UTC)
I still have no clue what you are talking about. I see that you created an article Cutains and The blinking reflex containing the above comment. I strongly suggest that you add a diagram, remove the two spelling errors in the article, and add some context. As the new article is now it is non-encyclopedic and a very likely candidate for WP:AFD. Also please remember WP:NOR. Han-Kwang 14:42, 1 November 2006 (UTC)
I'd say that this article definately needs an A-class or at least a GA-class rating on the assesment scale. I have nominated it for one of these ratings. G man yo 09:55, 28 February 2007 (UTC)
Unfortunately I have failed this article as there are a few areas in which I would like to bring to attention to the editors of this article in order to hepefully bring it up to standaeds in the future.
If this article was improved in the ways mentioned above and any other areas in which editors bring to attention then it may pass in future months/weeks. Telly addict 13:00, 3 March 2007 (UTC)
Anything authoritative on this issue?
Which makes the whole section a copyvio... ed g2s • talk 13:30, 9 August 2007 (UTC)
The Class 1 and Class I limits are clearly stated in the abstract ==> laser exposure may not exceed the MPE. However, while Class 2 and Class II limits are correctly expressed the for *visible* light (which Class 2 and II are specific to) Class 3x and Class IIIx and higher classifications continue to assume visible light. For instance, I work with lasers which regularly emit powers greater than 10 mW but which are still Class 1 - according to this page they would only possibly be Class 3b and Class IIIb due to the clear statement for each that lasers emitting greater than 5 mW radiation are such. There is also a serious problem with an earlier statement (section titled Classification) that the relevant units for MPE are W or J, and switch to W/m^2 at wavelengths greater than 4 um. This is just wrong. The relevant units are always, specifically, radiant exposure (in J/cm^2) or irradiance (in W/cm^2) for both MPE evaluation and classification. Statements like, "output may not exceed 5 mW" are rules of thumb for point-source lasers (in this case for visible Class IIIa lasers) which have implicit assumptions about beam diameter, ocular aperture, aversion response time, etc. built in. Looking first for response. If I have time perhaps I'll try to improve this. 64.32.245.242mjd 2007-10-29 16:42 EDT
I removed this: **When picking up something from the floor, closing the eye may not give sufficient protection against multi-watt laser beams, as the eye's lid is partially transparent, particularly for infrared light. Closing both eyes when kneeling becomes second nature and automatic for workers in such fields.. Not only is the remark about the second nature a bit strange, but also the first part is not correct. Although the eyelid may not absorb near-IR light, it still scatters the laser light which prevents the light from being focused onto the retina. Of course, a 10 W beam with a 3 mm diameter will probably burn the eyelid and possibly damage the cornea underneath as well, but this is not a very likely situation in a research lab, where the smell of burning clothes, skin, and wall painting would have drawn attention before. Han-Kwang ( t) 22:24, 1 November 2007 (UTC)
I suggest to insert the following additional reference, which is a page of my own "Encyclopedia of Laser Physics and Technology": article on laser safety in the Encyclopedia of Laser Physics and Technology
RPaschotta 16:34, 5 Nov 2007 (UTC)
Regarding these edits, I think I agree with Pzavon, both on how a class 4 laser can damage skin and on the suitability of therapy lasers for this article (i.e., not suitable). Therapy laser treatment seems to be an interesting topic though, that would probably be suitable for an article of its own with a bit more background on what kind of medical conditions this laser treatment would deal with. Han-Kwang ( t) 00:46, 16 December 2007 (UTC)
I think the sections on the old and new classifications should be merged. Most of the specifications overlap. I think there should be a small intro about the differences between the schemes, and then Class 1/I can be discussed together. IN the current version there's too much duplicate info. Han-Kwang ( t) 18:01, 12 February 2008 (UTC)
I will think about how to combine some text. The problem is that I am not familiar with the details of the old system to really be able to give an overview of the philosophies behind the two systems.
Something else: your recent edit summary: The definition of Class 4 is based upon determinations of what will damage skin. I looked it up, thinking that it was "skin damage OR dangerous diffuse reflectios", but indeed, The IEC standard says about class 4: "...for which intrabeam viewing and skin exposure is hazardous and for which the viewing of diffuse reflections may be hazardous. (emphasis added) Apparently, also from the description of class 3B, a laser can be dangerous in diffuse reflections without causing skin damage, and vice versa. I'll clarify this. Han-Kwang ( t) 13:05, 13 February 2008 (UTC)
The "old system" (quotes from article) has no information about when that classification system was in use, nor when the classification scheme changed. It also has a very old citation needed tag. The section should be fixed or removed. 134.29.231.11 ( talk) 17:36, 24 February 2011 (UTC)
This illustration of a label claims that eye damage could result if a Class 2 beam is directed at the eye for more than 10 seconds. such a label seems "off" to me. I am not aware of any labels containing explicit time limits. Can anyone really familiar with practice in the EU say whether such a label is actually in wide use? Pzavon ( talk) 23:42, 16 March 2008 (UTC)
I have edited the laser pointer section to reflect that, although red laser pointers appear to be safe and this shouldn't be denied, the overall tone of the article should still emphasise laser safety and the dangers of lasers in general. The paragraph removed consisted solely of an implication that people who complained over laser pointer exposure were liars, fraudsters or crybabies, which isn't too value adding above a simple statement of the fact that damage is unlikely to occur. 217.154.66.11 ( talk) 19:41, 14 April 2008 (UTC)
I just rewrote the section about conventional practice in research labs because I felt it was too much POV-, essay- and howto-like. Unfortunately, this is a subject that everybody who works in this area seems to know, but nobody writes down, probably because of legal consequences, so it still looks a bit like original research. I know many people who have had laser-related eye injury in a lab. The worst case is someone who damaged 30% of one fovea, meaning he can't use that eye for reading. And then there are many people who have a small burn. I did once have the opportunity to visit the R&D department in a laser factory, and the procedures were pretty similar to what I've seen in many university labs (goggles are available but only worn during very specific high-risk procedures). Any suggestions for references? Han-Kwang ( t) 18:07, 6 July 2008 (UTC)
Now, I'm no expert, but the reasons for this article failing at getting "good article" status seem to have been fixed. "Laser Safety" in bold is the first phrase in the whole article, there seem to be alot of links to other articles, the classes and class levels are now sections, and it has 7 categories. G man yo ( talk) 11:41, 2 November 2008 (UTC)
Okay, I've re-decided, this article is not necessarily a "good article" yet, however has the potential to soon be. It needs more sources cited inside of the text, and it needs to cover a couple more topics in the lead, even if just briefly (such as protective eyewear). If these things are fixed, then I think it could pass. G man yo ( talk) 14:50, 10 November 2008 (UTC)
I would like to see a few changes before considering this a "good article":
I can work on some of this, but unfortunately don't have access to the actual regulations to be able to know I'm being complete and to give references. The Photon ( talk) 03:21, 12 November 2008 (UTC)
Since glasses and contact lenses are meant to focus light, do they increase the damage by lasers to the retina? I heard someone one time wearing contact lenses the she was more sensitive to daylight light when she first put them on. 70.79.50.5 ( talk) 09:03, 7 May 2010 (UTC)BeeCier
It seems that the class of a laser product can be lower than the class of the laser it contains (e.g. a DVD burner is a class 1 laser product but IIRC tends to contain a class 3b laser). Does anyone have any more details on this? 86.1.116.158 ( talk) 07:20, 15 June 2010 (UTC)
Can someone comment on the following label found (on of all things) a weather forcasting gadget.
It shows the laser hazard symbol (as at the head of the article) with the following words.
CAUTION LED RADIATION CLASS 2 LED PRODUCT POWER: <100MW WAVELENGTH: 470 nm
The product has 3 LEDs on it but the label seems to apply only to the blue one. I assume that the power should have read "<100mW" as a 100Megawatt blue LED is going to take a heck of lot of power to drive it. It seems odd to put such a label on a product where the blue LED is positioned such that it's only purpose is to be seen. AFAICT, there are no lasers in it whatsoever. DieSwartzPunkt ( talk) 14:43, 17 February 2011 (UTC)
I don't think the old and new system headings need subheadings for each class within them. They should probably be consolidated, most notably the old system. The Photon mentioned this in an earlier section. In fact, the organization of the entire article is rather arbitrary. It seems like things could be grouped better and reorganized. G man yo ( talk) 07:35, 27 January 2012 (UTC)
Hello fellow Wikipedians,
I have just modified 3 external links on Laser safety. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
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After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than
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source check}}
(last update: 18 January 2022).
Cheers.— InternetArchiveBot ( Report bug) 19:13, 11 November 2016 (UTC)
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Cheers.— InternetArchiveBot ( Report bug) 17:35, 17 December 2017 (UTC)
Someone pointed out (over email, after 11 years) that there was an error in File:IEC60825 MPE J nm.png in the wavelength range 315-400 nm for exposure times > 1 ns. I have corrected the plot. I'm posting it here so that editors watching this page are aware of the change. Han-Kwang ( t) 10:55, 17 October 2018 (UTC)
Indirect laser light can damage camera sensors: https://www.reddit.com/r/photography/comments/ayua7d/tip_dont_record_laser_tattoo_removal/?limit=500 -- 94.21.11.150 ( talk) 19:08, 10 March 2019 (UTC)
Class 4 should be renamed to class 4a.
class 4b: Small part reflections, like dust, which still looked fairly dim at 460 milliwatts, are the next eye hazard.
class 5: The beam's appearance from the side in clean dry air, which still looked dim at 5.5 watts, is the last eye hazard. 94.31.84.138 ( talk) 19:34, 21 April 2024 (UTC)