UnknownVT said:Sorry - any color other than red above about 650nm cannot possibly preserve true (human) Scotopic night vision - as colors of shorter wavelengths than about 650nm will flood the eye's rods which are used for Scotopic night vision.
Please, without meaning any disrespect - I would much rather trust the USAF Flight Surgeon on a government web site (about issues which can be life or death) on this matter, than any advertising web site. So green or blue-green for preserving human scotopic night vision are just plain wrong.
However I do understand the advocation for green and blue-green for "night vision" (other than compatibility with night vision Equipment) - for dark adaption and not necessarily Scotopic (rods only) night vision - what we really want is the lowest possible light level that we can still see acceptably well by while not disturbing whatever dark adaption we have acquired.
In this case ANY color that we can see well by at low levels will do - and the key phrase is LOW level - so unless the light is DIM in the first place, or has an adjustable level - any color other than red advertized for human scotopic (rods only) night vision - is just that "advertising" - and plain incorrect information.
Please do read
USAF Flight Surgeon's Guide: Chapter 8
(about 2/3 down the page under the heading "Night Vision")
where you'll see that it is mentioned that some people will have difficulty see under red light - I do.
--
Vincent
http://UnknownVincent.cjb.net/
http://UnknownVT.cjb.net/
Unknown is also correct, LOW levels will work as well, but then I'd still use
white

Night vision equipment works outside the blue green range so a green light will not wash out the equipment... So blue-green will preserve your night vision when you are wearing the NV goggles, but not your natural sensors.
