I think the Surefire L2 is the best all around flashlight, especially for EDC use, I plan on getting one once I'm slightly less poor(i.e. making more than minimum wage). It uses a regulated LED and has variable output, either 15 or 100 lumens, with runtimes of 18 hours and 1 hour respectively. Long battery life for survival use and very very bright mode for signalling or tactical use. Seems lke the most useful combination to me.