What I Learned from the Optometrist

Well, I could not resist: during my appt at the eye doctor, I asked about light.
NIGHT VISION.
What color is less likely to wipe out night vision? Color, apparently, does not matter. The intensity of the light needs to be reduced to a low enough level.
COLOR RENDITION.
Which light is less inaccurate: LED (bluish) or incan (yellowish)? Well, what you need is an LED designed with pure white light.
LUX vs. PERCEIVED INTENSITY
A little more unsure. He said that such things are well known, but from an eye scientist, and for a little reseach. Well, I did find this link:
http://www.siggraph.org/education/materials/HyperVis/vision/eye.htm (click on 'intensity')
Apparently, it is logarithmic, but only over small ranges.

low level is most important for night vision, but your eyes can tolerate more red than any other color before it's destroyed.