A word on light in the urban environment. I EDC a small light on my keychain, an LED EMT style light in my other pocket, an LED mini mag in my messenger bag as well as a headlamp. If you've been caught at night (or during the day if there aren't any windows) in a building, during a blackout as many times as I (or most city dwellers) have, that light is the difference between getting out of the exit and cracking your head on something you've walked passed a hundred times but never noticed before.