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Oppose -- CRI is a very specific and measurable quality of light. Perhaps a better solution would be to create a more general "Color Rendering qualities of Light" topic wherein various measurables both quanititive and qualitative could be discussed <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/161.88.255.139|161.88.255.139]] ([[User talk:161.88.255.139#top|talk]]) 17:43, 2 May 2006 (UTC)</small>
Agree in part -- CRI is a terrible metric to use by any lighting expert's standards. However it is specific and important for historic reasons. Not to mention it's dominance in household products. CRI deserves to remain a page perhaps with the heading "CIE Color Rendering Index" to more specifically refer to the named standard. A new page on the topic of color rendering should be written using the following definition "The property of a lighting fixture which describes how the light it produces will affect the appearance of colored materials" [[User:TDcolor|TDcolor]] ([[User talk:TDcolor|talk]]) 19:39, 2 January 2021 (UTC)
== New test color samples section ==
The harv templates really mess with the flow of the text, since they display in parentheses, yet are used as important words or phrases in sentences. Looks like murder to fix... [[User:Huw Powell|Huw Powell]] ([[User talk:Huw Powell|talk]]) 01:23, 18 January 2011 (UTC)
:I agree; it never makes sentence to try to use a ref as a noun in a sentence, but editors do that all the time. [[User:Dicklyon|Dicklyon]] ([[User talk:Dicklyon|talk]]) 05:36, 18 January 2011 (UTC)
:I did some work on it. Let's see if anyone objects before we do a lot more. [[User:Dicklyon|Dicklyon]] ([[User talk:Dicklyon|talk]]) 05:58, 18 January 2011 (UTC)
:: Is anyone especially attached to the Harvard citations? I much prefer sticking a footnote at the end of each paragraph or so, and just writing “John Doe 2010, p. 50” or whatever in the footnote for each source already listed in the Bibliography/Sources section. Also, I think it works best when the sources listed in their own section (here called “Sources” but sometimes called “Further Reading” or “Bibliography”) are either especially comprehensive/readable, or else the most important original sources for some topic. Then putting a source in that section becomes a bit of an endorsement, suggesting that readers might turn to those sources first before venturing into the forest of papers. Finally, in general, I think littering an article with phrases like “as described by so-and-so 2000” is unnecessary, unless the author’s name is so important/relevant to the topic that it deserves special mention. Many of the sentences with such phrases in this article would be supportable by many sources, and so calling out the specific authors doesn’t seem worth the extra clutter and emphasis. I don’t ''especially'' mind Harvard citations – if the page’s main authors like them I’m not going to complain about their volunteer writing efforts – but I avoid them if I’m writing an article. –[[user:jacobolus|jacobolus]] [[User_talk:jacobolus|(t)]] 08:03, 18 January 2011 (UTC)
== Missing definition in chromatic adaption section ==
The variables <math>c_{r,i}, d_{r,i}</math> and <math>c_{t,i}, d_{t,i}</math>are not properly introduced. While the indices ''r'' and ''t'' refer to the reference and the test light source, ''i'' refers to the test color. However, it is not explained what the connection of ''r,i'' or ''t,i'' means. If it refers to the '''apparent''' chromaticity of the ''i''th source color illuminated by light type ''r'' or ''t'', this should be explained explicitely and unambigously.--[[User:SiriusB|SiriusB]] ([[User talk:SiriusB|talk]]) 15:08, 6 January 2012 (UTC)
:Solved so far. The web reference which contains the Matlab script clarifies the question.
:However, there is now another question: Where do the numbers in the example calculation come from? Are they extracted from some citeable reference or derived by numerical means? If the former is true, please give all references. If the latter is true, please give a detailed description of methods and sources, in particular: 1. The source for the F4 spectrum, 2. the numerical method for the chromaticity calculation (especially whether discrete values for e.g. 5 nm steps are added or an accurate interpolation and quadrature algorithm, e.g. cubic splines and Simpson's integration rule or better, is used. Inaccurate, non-repeatable description of the methods may render this part as original research. I have made calculations on this topic and found very good agreement but, however, no exact match of the particular DeltaUVW or Ri values. In addition, I can almost exactly reproduce the chromaticities for all F spectra with F4 as the only exception; source of data is one of the (equivalent) weblinks given at the and of the article.--[[User:SiriusB|SiriusB]] ([[User talk:SiriusB|talk]]) 20:49, 15 November 2012 (UTC)
:: Agreed; I've just spent two days trying to get these results to come out and too many steps are skipped to see where it's going wrong. Even fudging and playing with the significant figure requirements, I can't get the results to come out closer than several percent. The von Kries adaptation step especially goes wrong, even using the values directly out of the table from the preceding step. <span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/71.232.13.18|71.232.13.18]] ([[User talk:71.232.13.18|talk]]) 20:36, 16 September 2014 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->
== Typical values / Light Source Chart ==
Can regular incandescent bulbs be added to the Typical values / Light Source Chart? I can't tell if the last entry of incandescent/halogen refers to ordinary (classical) incandescent bulbs or only to the newer halogen bulbs. Do designations such as "soft white" etc. have differing CRI values? I notice a particlar LED-based bulb advertised as CRI of 80. This seems low. Is this typical? Thanks! --[[User:Lbeaumont|Lbeaumont]] ([[User talk:Lbeaumont|talk]]) 15:30, 5 March 2012 (UTC)
:Typical incandescents have a CCT of about 2700K, but still a CRI of 100 by definition. See [http://books.google.com/books?id=ax_MgxXtTa8C&pg=PA132 this book page]. [[User:Dicklyon|Dicklyon]] ([[User talk:Dicklyon|talk]]) 15:41, 5 March 2012 (UTC)
== Ra8, Ra14 ==
There is no mention of the Ra8 and Ra14 standards. -- [[User:Frap|Frap]] ([[User talk:Frap|talk]]) 14:44, 14 May 2012 (UTC)
:Ra8 seems to be the same as the Ra described in the artivle (averaged over the first 8 colors), while Ra14 should be the same with all 14 colors. BTW the German [[Stiftung Warentest]] uses both the standard Ra and the R<sub>9</sub> (red) index (or maybe an Ra9 equivalent to Ra but also includes TCS9) to judge the color rendition since red color hues are a typical but serious weak point of many fluorescent and LED lamps--[[User:SiriusB|SiriusB]] ([[User talk:SiriusB|talk]]) 20:58, 15 November 2012 (UTC)
== External links modified ==
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==References==
There are currently five sources involving the same set of authors (R. Dangol, M. Islam, M. Hyvärinen, P. Bhusal, M. Puolakka, and L. Halonen). Are these authors so prominent in this field that one quarter of all sources are written by them? Or is this another case of [[WP:REFSPAM|refspamming]]? <font color="#8b4513">[[User:Mindmatrix|Mind]]</font><font color="#ee8811">[[User_talk:Mindmatrix|matrix]]</font> 14:41, 7 November 2016 (UTC)
:imho definitely refspamming <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/131.155.212.62|131.155.212.62]] ([[User talk:131.155.212.62#top|talk]]) 09:22, 9 October 2017 (UTC)</small> <!--Autosigned by SineBot-->
:: I am Also a researcher in the field and have never heard of them. However it seems this is obsolete. I'm new to wiki, can it be removed from the talk page? [[User:TDcolor|TDcolor]] ([[User talk:TDcolor|talk]]) 15:07, 30 December 2020 (UTC)
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== Request: Add still photo to the "Film and video high-CRI LED lighting incompatibility" section. ==
| 