The
M91T is rated at 19k cd / 750 lumens, not 12k cd. I've had one for a long time and IMO provides a nice blend of throw and spill. I run mine on a MD3 body with a high/low switch;
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The HUGE advantage of the E2 Hyper Throw is that a far more compact light can be made with one. It's 35k cd reaches further than the M91T, its spill is just as wide but slightly less bright. But it's
much easier to carry vs. any of the MDx based lights;
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Finally, the gain of the standard E2XT (55k cd, 500 lumens) over the E2 Hyper Throw (35k cd, 500 lumens) is not that great. The 1.23" head diameter is a lot more noticeable in the pocket compared to the 1" head diameter of the E2HT. IMO, the candela gain of the E2XT is not worth the increased size or cost vs. the E2 Hyper Throw.
The E2XTD is a different story. It's rated by Gene at 70k cd, but my sample measures 82k cd. It's center hot spot is slightly brighter than my Hound Dog Super (cool version). It's a beast.
FYI, beam shots and profiles of the E2 Hyper Throw, Bodyguard v.2, E2 Super and E2XTD heads can be found
here. Be aware of beam shots posted on the Internet as the ONLY way to get a useful comparison is with a camera that can be locked in manual exposure mode. I use a Canon DSLR in manual exposure mode to take beam shots.
If ease-of-carry is not a big issue, the M91T with high/low switch on a MD3 or MD4 body is a very useful light. If you need a high-candela light that rides comfortably in a pants pocket, I would go with the E2HT on the body of your choice, and which can be fully powered with 2-CR123 batteries. If you want an insanely bright (at the expense of run time) light that can be carried in a pocket, go with the E2XTD,