Quite an interesting read about night vision.
Unaided night vision even now in the 21st century is still the subject of some controversy.
For those just looking for an executive answer as to what supplemental lighting should be used to reduced the recovery time back to night vision (dark adapted or scotopic) here it is: a fully dimmable white light! This of course is a very incomplete answer but so are the answers red or blue-green and you should know why.
Lets start with red, specifically what I will call the red light myth.
Read the rest here http://stlplaces.com/night_vision_red_myth/