Template talk:SI radiometry units

message: Added "confusingly called intensity" to radiance as well. Per steradian is used in Allens "Astrophysical Quantities", and Chandrasekhar's "Radiative Transfer" which are classics.PAR 07:58, 16 November 2005 (UTC)
thread_title: Older comments

message: Am I nuts, or shouldn't ALL of the entries in the abbreviation column be W/whatever (watts PER whatever), not W·whatever (watts TIMES whatever)?
If I'm nuts, my apologies... but acting on WP:BOLD I'm going to change them, and see what happens. Dpbsmith (talk) 23:39, 17 May 2006 (UTC)
thread_title:  Shouldn't they be watts-PER, not watts-TIMES? 

message: Note that the article Intensity (physics) is about intensity as power per unit area. The links to the usage of this term to mean irradiance, radiant exitance, and radiant emittance are correct. The comment that radiance is sometimes called intensity should not be linked to the article Intensity (physics), because Wikipedia organizes information by concept not by name. If there were an article on intensity as power per steradian per square meter, it would be appropriate to link to that article. In the absence of that, no link is appropriate. Essentially, there are two distinct meanings of "intensity" here (and a third elsewhere in the template). While they have the same name, they are distinct things and should not be confused (which is the point of that note in the first place). The intensity article also discusses this confusion of terminology, of course.--Srleffler 15:51, 26 June 2006 (UTC)
thread_title: Intensity and intensity are not the same thing

message: FWIW, I created a template named Template:SI photon units in analogy to Template:SI radiometry units and SI photometry units aka Template:SI light units. It's still "raw", but perhaps useful to some. --Matthiaspaul (talk) 16:55, 17 August 2011 (UTC)
thread_title:  Template SI photon units 

message: The table indicates that radiosity is power (presumably radiant flux) per unit area - watts / metre2. The article on radiosity indicates that it is radiant intensity per area - i.e., watts / steradian / metre2. Which is correct, or is their an ambiguity in usage? — Pingkudimmi 09:34, 10 August 2012 (UTC)
replies: text: Some of the wording in the article seems to be ambiguous or incorrect. Looking at the math, the definition section appears to say that the radiosity is the radiant intensity (W/sr), integrated over solid angle, which would make the units simply watts. The "radiosity method" section refers to "intensity" but appears to mean irradiance (W/m2) rather than radiant intensity. In that section, radiosity appears to have dimensions W/m2. It looks like there is an ambiguity in usage.--Srleffler (talk) 05:43, 11 August 2012 (UTC)
thread_title:  [[Radiosity (heat transfer)|Radiosity]] 

message: I'm not sure it was a good idea adding emissivity, absorptivity etc. to the template. This table was already much too big.--Srleffler (talk) 04:13, 7 March 2015 (UTC)
thread_title:  Too big? 

message: I removed reflectance and transmittance. It's not clear to me that the definitions were correct. "Radiance reflected by a system within a given solid angle, divided by radiance reflected by the system within another given solid angle." does not seem correct to me. Reflectance and transmittance are usually defined in proportion to what is incident, not to what is reflected in some other direction. This definition is either wrong or it is some specialized use of the term—too specialized to be presented in this table as a general definition. Defining these quantities in terms of radiance specifically may also not be correct. I'm more familiar with reflectance and transmittance as measures of relative irradiance, not radiance.--Srleffler (talk) 04:33, 7 March 2015 (UTC)
thread_title: Reflectance and transmittance?