The XT11 has a floody beam...it is not maximized for throw...but it does throw due to shear horsepower. The X10 has a narrower beam than the XT11, and throws harder than it, but with less flood.
In use (I have all of these lights), the XT11 is best when you want to see more at once, as it lights up a large area at a time with a large flood of light with a hot spot at center....as opposed to say a ZL SC600, which does the same thing, with no hot spot at center, but a much smaller distance from you than the throwier XT11.
The XT10's narrower beam throws that light further away, but lights up a smaller target area at a time...so you can SEE a target further away with the XT10 than the XT11, but the circle of light will be smaller to get that concentration.
This difference in beam type tends to confuse people when focusing on Lumens, etc....as they are distributed differently.
From Review #1 - (XT11)
"an estimated ~750 ANSI FL-1 lumens and ~700 ANSI FL-1 lumens, respectively, initially (with a common estimated ~530 lumens right after step-down at 3mins).
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From Review #2 - (TK15)
The TK15 was rated at a MAXIMUM of ~ 380 lumens on max output - LOWER than the XT11 is AFTER its step down to 530 lumens...from ~700 lumens.
The TK15's beam profile though, akin to the XT10 - is designed to focus the beam down range too.
So, anyway...the type of beam profile that works for an individual will mean that any of the lights can be the right choice...and its just a question of choosing the right tool for the job.
When reaching for a socket...I might see two 22 mm sockets, but one is for a 1/2" drive, and one is for a 3/8" drive ratchet....
The lumens might be OK, but the beam SHAPE might be different...and so forth.
