I play with flashlights quite a bit and I've seen many of the "adjustable"
flashlights that were FAR from as advertised (in other words, I've not
tried one of these). Think about one factor; how do you increase the
output of a flashlight by adjusting its focus? You don't.
So . . . . I went looking. One of the reviews is/was from a "Tactical" outfit
that is claiming wondrous things for it. Then I looked closely and saw that
the picture showing it illuminating a multi story dwelling, was from a flash
with a head diameter three or four times what the base unit has. Humm.
The advertisements on TV show it doing things that a flash with the
advertised output would have temporarily blinded the "BG", not just got
him to cringe (could just be the advertisement). I also looked at the
distance it advertises. 150 to 250 yards. That's not what I expect to see
from a flash with that (advertised) output. I have several models that
are rated a bit less (1K, but produce more like 750 to 775 lumen) that
are rated at 350 to
500 yards coverage.
I'll summarize by saying that I am skeptical.
If you want one in that price range the one that I've had excellent results
with is the Nitecore EA41. It runs on four AA batteries. They can be
alkaline or rechargable (NOT 14500s). There are two versions, one has
about a 350 yard usable, and the other has a 500 yard usable. The
difference is in the reflector cone and price. OOPS! I almost forgot. You
want the 2015 version (higher output).
Here is the 350 yard version:
https://www.amazon.com/NiteCore-Lumens-Flashlight-Compact-Searchlight/dp/B00LNSQRKK
If you do go with one of these
LOOK AROUND - PRICE SHOP!
You can get the exact same one for $45 or $100!
P.S. Found the one you were looking at on Amazon for $10
https://www.amazon.com/dp/B01J5ZLTHI?psc=1