What color cover preserves night vision best and gives off low light signature so someone cant see you as good as with white light? Is red the best or is blue better? I think I would run a Surefire E2D as a main light and the AA Fenix LD10 as the low capable navigation possibly with a red filter. Larue tactical sells a double light mount that would attach to the rail of my rifle. How durable is the Fennix Ld10?