Talk:Lighting

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Tesla[edit]

Please amplify Tesla's contribution to lighting; I see he has a couple of lighting patents, but were they ever commercialized? --Wtshymanski 21:49, 3 Jun 2005 (UTC)

Alternating Current is very commercial. Tesla was stifled by Edison and his own tortured genius. THIS ARTICLE IS NO HELP BY THE WAY —Preceding unsigned comment added by 209.121.199.127 (talk) 22:13, 16 December 2010 (UTC)

Lighting Design[edit]

There are already two articles to which, I believe, lots of the information pertaining to Architectural lighting design and Lighting designer (theatre) should be moved/merged. - Sticki 16:37, 3 October 2005 (UTC)

Four articles will help with the ambiguous citations.

  1. Lamp is the specific term for light bulb. Take the entire Lamps section from the Lighting article and merge into the article for Lamp.
  2. Lighting Design = general priciples of lighting and light fixtures for all applications. Move content from the first two paragraphes of stage_lighting.
  3. Architectural lighting = techniques and light "fixtures" specific to buildings and landscape. The top half of the Lighting article (up to Types of conventional theatrical fixtures) to be edited for accuracy and merged into the Architectural_lighting article. New topics include photmetrics, glare, specific applications (retail, stadiums, etc.) recommended lumens, rules of thumb, etc.
  4. Stage lighting = techniques and lighting "instruments" specifically for performance events The existing Lighting_designer article to be merged into Stage_lighting, along with light technician, lighting board operator and theatrical electrician, as per merge suggestion. The bottom half of the Lighting article can also be merged into the new Stage_lighting. - Dogears 04:43, 29 December 2005 (UTC)

Types of Conventional Theatrical Fixtures[edit]

I am going to merge your words on theatrical fixtures to the more relevant articles in Stage lighting and Ellipsoidal. Please continue to contribute to them in their new location! - Sticki 16:43, 3 October 2005 (UTC)

Harp Lamp[edit]

What would the opposite of a harp lamp be?

Turn the lights off?[edit]

Someone just added the following text to the article:

A myth about lights, especially fluorescent lights, is that they require a significant amount of extra electricity to start up. As a result of this myth many people leave the lights on when leaving the room because they mistakenly believe that turning them off and then on again requires more energy than just leaving them on. In fact, the amount of extra electricity required to turn on a light is so small it's not reflected in electric bills, even over thousands and thousands of power-ons.

I agree with this statement, but it is definitely not a myth that the life of a fluorescent tube is reduced by frequent starts. Each start (that strikes a new arc) blasts the cathodes a little bit, removing some of the material that helps them efficiently emit electrons. I suspect the tradeoff (lamp lifetime versus electric usage) still favors turning things off, but it's not completely clearcut that one should always turn off the lamps for that one minute you'll be out of the room. - Atlant 01:37, 25 February 2006 (UTC)

Yes, but I carefully didn't address the issue of fluorescent wear. I said that many people leave the lights on because they mistakenly believe that turning them off uses *more energy*. I'll leave the concept of fluorescent wear to another editor; I didn't feel like opening that particular can of worms. Incidentally, the breakeven point for a $2 CFL bulb and $0.10 kWh is 24 minutes, but if you turned off the lights anyway when you left the room for only 16 minutes, four times a day, for a whole year, with two 15-watt CFL bulbs, you'll pay an extra $0.58 in wear over what you save in electrical costs. Whoo-hoo. -MichaelBluejay 02:21, 25 February 2006 (UTC)
i agree strongly with michael bluejay on all accounts. this myth is way out of hand and the source of enourmous energy wastage. i find it unbelievable how many supposedly educated people hold onto this myth. i have conducted interviews with hundreds of building managers on this point and many believe they should leave the lights on all night to avoid the pulse!!! bluejay is correct about the priorities here. furthermore in my case study experience, we ve found it hard to determine differences in bulb life from different forms of use ( i know they are there but seem to be masked by the statistical distribution of normal bulb lives) cheers Anlace 03:49, 25 February 2006 (UTC)
Thanks for the note. You know, I started thinking, and my assumption of 10,000 hours life / 3-hour test cycles = 3,333 power-ons is suspect. I've lived in my house for three years and turn on some of the lights at least four times a day. That would be 4 times/day x 365 days/yr. x 3 years = 4380 power-ons. But I've never had to replace a CFL since I lived here, and in fact I brought these CFL's with me from my previous residence. I'm suspecting that if the burn time per cycle is shorter, you get more power-ons for the life of the bulb. If I get around to it I'd like to set up a series of lights with timers and run them for a year at various burn times to see how many cycles I get. (e.g., Light A would be 2.5 hours on, 0.5 hours off, Light B would be 30 minutes on, 15 minutes off, Light C would be 10 minutes on, 5 minutes off.) The trick will be finding (or making) inexpensive timers to control that. -MichaelBluejay 04:14, 25 February 2006 (UTC)
You may want to use X-10 and computer control for your experiment; it's pretty cheap and easy. I'll predict that shorter burn times will give you many more power-on cycles but a shorter total number of running hours for the lamp.
I don't think I have the hard copy anymore, but the reference(s) I was thinking about were publications from years ago by either General Electric (likely) or Sylvania (possible) where they had taken extensive life data on the then-standard 96" instant-start lamps and some variants on the good-old F40 48" lamp. At long run times (perhaps even continuous), the life of the lamps was ~20,000 hours. At short run times, it was as low as 4,000 hours. All of this is from memory, so add grains of salt as necessary, but the principle of cathode damage probably still applies even to modern compact fluorescent lamps. I think designs that preheat the cathodes (for example, ordinary "rapid start" circuits) probably don't blast the cathodes as much as "instant start" designs that strictly use high voltage breakdown to strike the arc.
If I get a chance, I'll Google around and see what the current thinking is on all of this.
Atlant 13:39, 25 February 2006 (UTC)

Energy consumption[edit]

"Artificial lighting consumes approximately one quarter of all energy consumed worldwide." I can't believe it. As a rule of thumb, energy consumption in a developped country is ventilated as one quarter each for industry | agriculture | transport | habitation. Especially habitation is illuminated, and I suppose energy consumption is much lower than for heating. Perhaps It's one quater of electricity consumption? I replaced the term by "a significant part". --Marc Lacoste 10:47, 17 April 2006 (UTC)

"Energy" is commonly used as a synonym for "electricity" in American English. The editor probably meant one quarter of all electricity. -kotra (talk) 08:02, 31 December 2007 (UTC)

I'm not sure if your calculation of power consumption is correct: A single 100 W light bulb used just 6 hours a day can cost over $25 per year to use (.12/kWh). My calculation: 100W x 6h/day x 365 days/year = 219000Wh or 219kWh per year. (Jesus Bermudez)

Ancient lighting[edit]

I would like to see some credible discussion of (possible?) ancient lighting sources such as those discussed here: http://www.geocities.com/athens/Olympus/6581/ancient_lights.html This may represent the flaky end of the subject of lighting, but on the other hand it is hard to believe that throughout history until the end of the 19th century mankind contented itself with burning fats and oils with no real developments in technology whatsoever. There are historical sources that detail artifical lighting, enough that we know it was an important subject throughout history. So some historical discussion or link to a related article would be appreciated. Amity150 11:36, 9 July 2007 (UTC)

99.54.139.134 (talk) 00:18, 11 July 2010 (UTC) Sybaris was reputed to be the earliest area in Greece to known for luxuries among which was street lighting when other city/states remained primitive.

Non-electric lighting[edit]

This article appears to only discuss electric sources of artificial light. Shouldn't it also discuss non-electric lighting? For example, skylights, candles, oil/kerosene lamps, etc. These are all still used for lighting today, particularly in areas without consistent electricity. Are those not considered forms of lighting? List of light sources has some others, though I think only the ones that are used to illuminate interiors could be considered "lighting". -kotra (talk) 07:55, 31 December 2007 (UTC)

99.54.139.134 (talk) 00:23, 11 July 2010 (UTC) The phrase: Of the first, second, and third light. Gertrude Whiting, Tools and Toys of Stitchery (New Your: Columbia University Press, 1928), p. 253 in reference to lace makers using a raised lamp surrounded with globes of blue-tinted water to diffuse the light to rows of tatters, the best closest (first).

Health Effects[edit]

The sections badly needs citation. It is also written with old data based on flickering fluorescent light sources with bad colour rendering. With modern light source headaches do not happen anymore. —Preceding unsigned comment added by Mitjaprelovsek (talkcontribs) 08:50, 13 January 2009 (UTC)

Rating: Class C[edit]

I have given the article the C rating due to the uneven content, if anyone disagrees please discuss.--Thorseth (talk) 11:04, 9 March 2009 (UTC)

liquid fuel lighting[edit]

Will it be possible to incorporate the following links on liquid fuel lighting [1][2] and [3] —Preceding unsigned comment added by 59.95.52.154 (talk) 14:14, 29 April 2009 (UTC)

CRI and color temp of lighting?[edit]

Would it be wrong to add a section about color temperature and color rendering index to this article? It seems to be a big part of what people think about (often without knowing it) when they have a problem with the lighting in a room. Seer (talk) 22:29, 30 July 2009 (UTC)

I would strongly support such a section, as long as we keep it factual. That obviously goes without saying in an encyclopædia; I only mention it because those two terms are widely and severely misused in marketing campaigns. We would need to be especially careful not to weave any of the many folk definitions of terms like "full-spectrum" into these sections. As for the configuration of the section(s) in this article, I think they needn't be more than brief conceptual overviews with "Main article:" links to the relevant articles for detailed coverage. —Scheinwerfermann T·C00:22, 31 July 2009 (UTC)
I second the suggestion, I think it should go in the measurement section as both concepts are tied to actual measurements. --Thorseth (talk) 11:32, 31 July 2009 (UTC)

Merge article: Architectural lighting design[edit]

I strongly believe that the Architectural lighting design article be merged with this article as the field of architectural lighting design is not particularly notable in its own right. Further, the design section in this article points to the Architectural lighting design page when in fact the main lighting article already contains much more useful information on the subject. It is also incorrect to imply that lighting design and architectural lighting design are the same, since much lighting design is wholly practical in its nature, whereas architectural lighting design concerns itself only with aesthetics: as such, citing the Architectural lighting design page source as the main article is wholly misleading. --Headlessness 17:24, 14 August 2009 (UTC)

Having read the guidelines on merging, I have gone ahead and carried out the above. This has had very little impact on the 'Lighting' article as there was very little usable material. --Headlessness 17:56, 14 August 2009 (UTC)

If you want to merge those articles, you need to propose a merge and wait for approval by other editors. You can't just force this without any discussion. -- Marcel Douwe Dekker (talk) 20:37, 14 August 2009 (UTC)
It's not "forcing", it's editing, and being bold and carrying out mergers is positively encouraged in the guidelines. Since the Architectural Lighting article is especially weak, it seemed ripe for merger. However, since you have called for a discussion, I am happy to have one. I'm just not sure there are grounds to call for a discussion. -- Headlessness (talk) 09:16, 18 August 2009 (UTC)
The fact that there are no more than one or two paragraphs in architectural lighting design that are not matched in this article should be reason enough. As long as the architectural lighting design is so loosely covered I don't think it needs its own article. If however more content was added then it would be another matter altogether. --Thorseth (talk) 11:25, 18 August 2009 (UTC)
I think the lighting design portion could usefully be spun out into the theatrical and architectural design articles. All of the articles need work (if I don't learn anything about lighting from these articles, then they *msut* be pretty skimpy!) --Wtshymanski (talk) 15:27, 17 February 2010 (UTC)

Measurement Section is not clear and concise to the Layman[edit]

I think we need to re-evaluate the wording on the Measurement section. This part is not going to be clear to the layman who may simply want to know the units of measure commonly used and how they are calculated. As an Encyclopedic reference, this should be complex at the end, not by the third sentence in my opinion. Lumens are completely ignored as well. What does everyone think? User:PatrickCarbone 14:53, 2 August 2011 (EST)

I think you are right. Please put in your suggestions ( WP:BOLD ) --Thorseth (talk) 08:43, 3 August 2011 (UTC)

12 volt lighting???[edit]

How about a section on 12 volt lighting? By this I mainly am referring to household lighting that has 12 volt bulbs or lamps, but is plugged into 110V (single phase in U.S.) and converted to 12V through the use of transformer or circuit board, etc? Questions tobe answered would be: are we really saving electricity?, can we get equivalent lighting output with this method?, are the bulbs' wattage figured based on 12V or 110, for instance ohm's law-- is a 12 volt .5amp (500 miliwatts) using just .5 amp of house current, or is it using 5amps of house current. Stuff like that. sections could be types of bulbs, color spectrum, etc. Any interest in this or is it alradyon WP and is there a link on this article? 12voltlighting (talk) 18:47, 4 February 2014 (UTC)