It's a fairly new light of theirs. 3 watt led, 60 lumens output and it's supposed to run up to 6 hours on two AA batteries. 60 lumens makes it just a touch less bright than a Surefire G2; I've got no way to measure it, but it passes the 'make you scream and cover your eyes' test*. And it is a white light, no sign of the blue tint most led lights have shown until recently. Turns on at the tailcap, like so many now: turn it all the way down for constant on, back it off a half-turn and press for momentary on.
Since I find myself with a shortage of AA alkaline batteries a ' turn it on and leave it until dead' test will have to wait a day or two. So far I like it.
Oh, did I mention the price? $20.
*No, I did NOT point it at my eyes and key it; I'm comparing it on the wall to my Surefire.