The EagleTac SX25A6 runs at a staggering 1305 lumens and runs on 6 AA batteries ( Batteries Not Included ).Cree XM-L U2 top-binned Led. The SX25A6 runs for 200+ hours on its lowest brightness level and 1.8 hour on high mode. It incorporates a Clicky on/off side switch & a twist of the head will quickly select the output mode. The super compact size and light traveling weight make it very handy to operate, even with one hand. It also allows tail-stand for ceiling bounce.