Carrying Arc AAA with keys?

[Chingyul]

How much do keys scratch up the Arc. Planning to get one and put it with my keys. The led on my photon is pretty scratched up. What type of anodizing is on the standard Arc-aaa.

Dan

Ps. The Turq is the brightest right? How good is it for navigating in the dark. Is depth perception good or ok?
Thanks alot