I'll have to render some _dark_ scenes and then check them out after adapting to
the dark...

http://www.laserfocusworld.com/articles/print/volume-52/issue-01/features/photonic-frontiers-color-measurement-light-so
urces-and-vision-led-lighting-makes-new-demands-on-color-measurement.html


"In mesopic vision, eye response varies from the photopic extreme of fully
light-adapted (m=1) to the scotopic extreme when fully dark-adapted (m=0). Note
that the eye is far more sensitive to blue light in the dark, making blue light
look brighter at low light levels. (Courtesy of Teresa Goodman, National
Physical Laboratory, UK)"

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