Cyan, etc...
Cyan is a cross between blue and green, but not as obnoxious as turquoise. I only know that from my time working in a photolab, as cyan is one of the three major colors used for color correction. (yellow, magenta, (a shade of purple) and cyan)
Based on what I've read only, I would have to choose amber as my second favorite. It has the good blend of being a color the eyes are sensitive to and not screwing up night vision as badly as other colors. That is only based on what I've read, mind you.
In my military experience, I've used green and red. It is true what they say about green affecting night vision and red not affecting it.
In the meantime though, I will stick to white. After all, why do you need night vision if you have a ton of flashlights? It can actually be an advantage to use a bright white that ruins night vision. If you are out or even at home and are accosted, you can blind the hell out of someone (MUCH more them than you, heheheh) and gain an element of surprise and a vision advantage. That would buy you enough time to administer a quick kick to the nuts and run like hell. /ubbthreads/images/graemlins/grin.gif Think about it, you don't often see cops with red lights, except maybe SWAT cops...
I suppose I've babbled long enough, hehehe.
-Jeremy