Much has been written on this topic but there seems to be a lot of
unanswered questions. All I can say is don't trust anything you
hear: try for yourself! Individual's eyes vary a lot, too, so what
works for me may not work for you.

That said, I find that the color of the light doesn't matter much,
it's the intensity that counts for me. Try a dim white light before
you spend a lot of other effort.

Also, I find that I can't read unless the light is so bright that it
kills my dark adaptation. Fortunately, I've become mostly a lunar /
planetary observer recently so it doesn't matter :-)

Bill Arnett
http://www.seds.org/billa/
"I know that I am mortal and the creature of a day; but when I search
out the massed wheeling circles of the stars, my feet no longer touch
the earth, but, side by side with Zeus himself, I take my fill of
ambrosia, the food of the gods." -- Claudius Ptolemaeus (Ptolemy)

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