I use Red most of the time, but have a few green lamps. White lights are for human benefit in searching for things. I suppose I use reds mostly out of habit, but two thoughts: green seems to flash in the eyes more distinctly than reds (not necessarily brighter), whereas I can see a better definition of the field with reds. In other words, I don't feel like I can see the field, or a predators body as well with the greens, so my eyes aren't "flooded out" as badly, so then when the eyes pop, the contrast is high.
But, then again, I've never had equivalent lumen lamps side by side to compare. That's just a generalization of what I have noticed between using different lamps and lights of different colors. HATED blue lamps, for what it's worth.