I vote for green. I can see green several minutes later than I can see red or orange, and that's when it matters. Any color works when the sun is high. When I choose to paint an opaque sight rather than install a fiberoptic, I paint it white. To my estimation, a matte white bead can be seen later than any fiberoptic. TEHO.

Our God reigns.
Harrumph!!!
I often use quick reply. My posts are not directed toward any specific person unless I mention them by name.