> 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)"
>
>

This look strange. Blue light cause your iris to contract, reducing the 
amount of light that enter the eye. It also cause saturation of the sick 
cells in your retina, killing night vision. At the same time, the eye is 
far more censible to light in the yellow region whitch don't cause 
saturation nor contraction of the iris.
When sodium lighting was adopted, the considerations where:
It pierce fog and smoke.
It preserve night vision.
It takes less lumens to get the same physiological brightness.
The lumen to wat ratio is higher.

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