I've been in an interior room of a large building during a couple of power failures. The first time, I didn't have a light. No fun. On subsequent outtages, I simply turned on the light and walked out. A tiny little light can make a HUGE difference in capability in the right situation.

You might enjoy some of the stories in this thread from candlepowerforums.com about the use of small LED flashlights during the New York black out a few years back (an urban environment).