Talk:Luminous flux

message: The defintion given on this page is precisely the definition of lumen, the physical unit in which luminous flux is allegedly measured.  --Smack 19:54, 4 Jan 2005 (UTC)
replies: text: I added as an example the luminous flux of a 100W light bulb. The page on incandescent light bulbs has more information on the efficiency of different light sources. A table of example values might be useful here too, if someone feels like putting one together.--Srleffler 04:09, 2 December 2005 (UTC)
thread_title: Untitled

message: Luminous flux dimension should be watt not joule. Who wrote this staff has no clue at all of physics. Shame on you.  — Preceding unsigned comment added by 86.71.62.229 (talk) 17:19, 25 February 2012 (UTC)
replies: text: If you're talking about the "Dimension" column of the table, you need to read the footnote (#3, I think). "J" in that column does not stand for Joules; J is the recommended symbol for the dimension of luminous intensity.--Srleffler (talk) 05:41, 26 February 2012 (UTC)
thread_title: J

message: I would like to add a section on the relationship of Luminous Flux to Luminous Intensity (i.e. Lumens to Candela). The reason is that sometimes Luminous Flux is quoted for light sources and sometimes luminous intensity. Before I did so, I wanted to be sure that I was understanding the difference myself. As I understand it, if you had a 1 Candela bulb and arranged the optics of your lamp so that all of this is focused into a beam of 1 steradian then you would have a 1 lumen lamp. If you were to change the optics of your lamp so that the light is shining into a beam of only 1/2 a steradian then you would have a 2 lumen lamp. Am I understanding this correctly? Op47 (talk) 12:27, 11 October 2013 (UTC)
replies: text: No. The luminous flux (in lumens) is the total amount of light the lamp puts out. The luminous intensity (in candelas) is a measure of how concentrated the light is, in angle. If you have a 1 lumen lamp and set up optics to focus the light evenly into a 1 steradian beam, then you would have a 1 candela light source. If instead you concentrate the light into a 1/2 steradian beam, you would have a 2 candela light source. Either way, the luminous flux emitted by the lamp remains 1 lumen (assuming the optics don't absorb any light).--Srleffler (talk) 13:55, 12 October 2013 (UTC)

text: I substituted the template into the articles. Typically a paragraph like this is going to need to be edited to fit the context of each article in which it appears. Simple things like whether luminous flux or luminous intensity is mentioned first, and not repeating things that are already covered earlier in the article make templates not so useful for paragraphs of text.--Srleffler (talk) 18:35, 8 December 2013 (UTC)
thread_title:  Relationship to Luminous Intensity 

message: 'Standards organizations recommend that photometric quantities be denoted with a suffix "v" (for "visual")'
Should this refer to "subscript" rather than "suffix"?  Gwideman (talk) 07:38, 17 February 2016 (UTC)
replies: text: fixed — Wassermaus (talk) 07:09, 3 September 2019 (UTC)
thread_title:  Suffix or subscript "v"? 

message: Check the spelling on the picture  — Preceding unsigned comment added by 121.243.44.34 (talk) 00:30, 26 April 2016 (UTC)
replies: text: I removed the image from the article, until it is fixed. These images have been discussed at Talk:Lux#New images.--Srleffler (talk) 04:44, 26 April 2016 (UTC)
thread_title: Lumimous? really?

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thread_title:  External links modified