Amazingly powerful light for its size - Nitecore MH10 LED 1000 Lumen Rechargeable USB Flashlight

It's like having an extra vehicle headlight on my belt; it lights up a wide area like daylight-- with high noon in the center and late afternoon at the edge of the beam-- and has a range of several hundred yards. Recharging from a powerpoint on the way to work beats the heck out of paying for a constant stream of CR123As, and the multiple settings mean it's just as useful for checking a map as for disorienting an attacker; on the highest setting the strobe effect is physically painful to look at in the dark at close range, so it is indeed a serious self defense tool. Far and away the best flashlight I've ever owned, I would absolutely recommend it to anyone who wants access to a huge volume of light in a tiny package.