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Emphasise parallels between units?[edit]

Hi folks. I'd like to suggest updating this article slightly to emphasise the parallels between the radiometric units and photometric units. I have my own 'cheat sheet' which is very similar to the tables here in the "Illuminance" and "Irradiance" articles, but with the related terms side by side (e.g. irradiance next to illuminance, radiant intensity next to luminous intensity etc.) I find this helpful in remembering and understanding the terminology. Thoughts anyone?

Regards. Trustmeimanengineer (talk) 12:24, 20 May 2010 (UTC)

That table arrangement is useful, but this probably isn't the right article for it. The articles on photometry and radiometry might be a better place for a summary of how all the units relate to one another. Another editor has done something similar at Light intensity.--Srleffler (talk) 03:04, 21 May 2010 (UTC)


Regarding this edit, and the reason given: "Brightness usually meant luminance, not Illuminance."—that's exactly right, which is exactly why the also-common use of the term brightness to refer to illuminance led to confusion, as stated in the article.--Srleffler (talk) 04:22, 29 October 2014 (UTC)

I see that you have struggled with this before. Thanks for your earlier contributions to the article. I added luminance, and took out the citation needed. I hope I have improved the article. Wikfr (talk) 00:01, 30 October 2014 (UTC)

Calculating illuminance at a point[edit]


I propose removing File:Illuminance.svg, because it does not relate to the article, and is not discussed in the article. The illustration contains many complicated symbols, which are not defined, and are above the level of an average encyclopedia reader. Illuminance is usually about the average light over an area, not at a point. Wikfr (talk) 23:40, 29 October 2014 (UTC)

I agree that the image and its caption, as they are, are not a good contribution to the article. Deleting them would be one solution. Another would be to move the math from the caption to the body of the article and explain it fully.--Srleffler (talk) 04:11, 30 October 2014 (UTC)