The Surefire M6 is the most powerful handheld light I know of short of a HID and is top quality. I was testing one last night against some cutting-edge Q5 Cree lights and none were close to touching it. That may change next year once the S-bin Cree LED ships: LEDs will then have the throw of an M6 and a 3-LED light will have the overall power. But right now the M6 is the king (and costs a king's ransom!).
I think that the Surefire M6 with the standard MN20 lamp assembly with give around 250 Lumen for around 1 hr using 6 CR123s. The replacement MN21 (not sure whether this is a Xe or HID lamp assembly) will give 500 Lumen for 20 minutes again using up 6 CR123s. The brightest Fenix is currently the P3D using a Lumileds Rebel giving 200 Lumen for 1.8 Hours using up 2 CR123s. The Fenix is 4 time more efficient is also 10 times cheaper and quarter the size and weight of the M6.
Or how about the Microfire Warrior III K3500R giving 3500 Lumen for over 50 minutes using a rechargable lithium ion cell. It is only slightly larger and heavier (12 oz) than the Surefire M6 and not that much more expensive. This will beat the Surefire M6 hands down.
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