I just came across a discussion by Clipka (in answer to a question by Mike
Horwath in 2015) about LIGHT use in v3.7xx-3.8xx, when using assumed_gamma 1.0:
"Should we use rgb or srgb colors in light sources?"
http://news.povray.org/povray.binaries.images/attachment/%3Cweb.5dc98ba0982994b4e0c1802f0%40news.povray.org%3E/clipkas%
20gamma%20tutorial.pdf
It is definitely worth reading, as it covers other gamma-related color topics as
well.
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