My biggest light-hog is my camera.
working as a mechanic in a darker shop i'm always tring to use a flashlight and my hands at the same time. i've been using the niteize headband for years, right now im running a sc51f, side click protrudes just enough to not be blocked at all by the loop in the band. when its not on it drops into your pocket nice with a little bit of the headband poking out easy to grab. and the niteize is only a few bucks anyway.