I have seen the light regarding the newer LED flashlights and am simply amazed by how much light can be harnessed by many of these new, high-output LED modules. Cree MC-E quad, Luminus SST-50, Cree XP-G R5 and others ... simply amazing. Of course, the cost of 500 lumens and more is run-time.
What do you feel is the "right" balance of run-time to light thrown, in a mixed-purpose flashlight for defensive/utility purposes, one that you carry every day? How much and why?