rygD
Nihilistic Mystic
That is why I made my joke/comment. However, I agree that red coming from the keys will be less bothersome and irritating than white when looking at the screen, regardless of if you have the screen blasting you with full brightness or very dim. Looking at the keys in the dark, which is the purpose of the backlight, will be less like staring at a bright light in a dark room. It may be different when it is diffused. Also consider playing a game that is dark on screen, or anything else where the display isn't mostly white, yet you may need to look at keys occasionally. I personally change settings on most of my computers so I am not staring at a bright white screen when I am using them.Unless you're planning to use it in the dark with the screen off, I don't see how it affecting your dark adaptation is of any significance at all.
Since ED said we are getting white LEDs for the keys, aesthetically I prefer red and orange for Pyra's additional key markings over blue.