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I realize you are probably looking for something smaller, but when it comes to "regular" size flashlights (like a 3 "d" cell Maglight back in the day) I really like the rechargable Streamlight brand SL series. The latest generation (that I have seen anyway) is a double switched rechargable. You have your choice of 3 very bright LEDs with an 40 hour run time (yes 40 hours) on a single charge, or one hour of 40,000 candlepower "regular" beam. I've had the opportunity to assist LEOs at times removing intoxicated persons from their automobiles. (Basically I'm a human lamp, keeping light on the subject so the officer has both hands free to deal with the subject). I use the LED mode only as this provides more than ample light for observing the subjects hands, scanning vehicle for weapons, etc. This keeps your night vision more intact than the full power mode. But if the subject begins to act "froggy" in the least, a nice 40,000 candlepower blast in his/her face really does the trick. Even when they close their eyes that 40,000 cp blinds the heck out them. I have to admit its a good feeling to blind a potential bad guy and give the LEO an additional edge.
Now maybe these new generation LEDs can do this too, but I don't know if they are rechargable.
P.S. I think I read it is a natural human reaction to turn ones head away from a very bright light (and what I've seen would back this up) and thats pretty handy (getting a bad guy to turn their head away from the LEO or myself, kind of takes the fight out of them before it even starts).