Nice, I've been looking an 18650 zoomie, ordered one also :)
I use a small portable fan, shine the flashlight through it and look at the fan blades.
I'm not sure what's the rpm (revolutions per minute speed) of the small portable fan I'm using, but it's so far able to show "slower PWM" and "faster PWM" by visually looking at the light passing thru (reflecting thru?) the blades.
For instance, I made a simple video.
one uses Biscotti (faster PWM, not so visible to most people in normal situations)
one uses Convoy 5/3-mode group driver (PWM is a bit more visible)
Left side shows the faster PWM on Biscotti, right side shows the slower PWM on the Convoy 5/3-mode driver
Well, it arrived to today, and to be honest I'm a bit dissapointed,
https://imgrpost.com/album/hm3h
It's not like my other Sofirn lights in any way (Q8, SP33, SP32A, SP10S, SP10A, C01S) hard to explain, it just not a Sofirn light, Funtastic is right.
The beam shots in the album are not what I wanted from a zoom light, I was approx 6ft from wall when photos taken, camera was in manual mode so no auto exposure correction going on.
When in wide there is a halo, zoom and you just fill the halo, not really a zoom if you ask me, the area filled is about the same as my Convoy S2+
There is no lens just a frosted dome over the led, the USB charging port cover feels like it's going to rip off first time it get shoved in my pocket, the red light is the charging light, I was hoping it would slowly fill up as battery charges but after 2 hours it's still the same, I'll report back when fully charged.
I also own this https://www.aliexpress.com/item/32951612021.html yes it's cheap no name probably fake XHP led, but I it's super bright and the zoom is excellent.
That is really bad. Took one for the team this time.
Thanks for taking the bullet for me, I was about to add this light to my Sofirn order to hit the $100 mark (10% off at Sofirn.com). I decided I need another IF25a, lantern and C8G… just a few bucks over $100– so NOW it’s $91!
Damn… I’m addicted 
I would rather call it S11B, because it is not made by sofirn. S11B and D25/D25S are made by the same factory. If you have any D25/D25S headlamp, you know the quality.
Furthermore, I am upgrading S11B to be S11C: LH351D LED, simple UI:
click to turn on/off, press and hold to choose brightness from Low-Med-High. Press and hold to Moonlight from off.
Triple clicks to Strobe from off; 4 clicks to lock-out from off.
How about that?
The first thing with a zoomie is getting the lens type right, the focus, and the zoom mechanism. We know you are capable to build the rest.
Don’t waste your effort fixing up the UI or LED if you don’t address the most important parts first.
Hey HC… thanks for the referral. That’s a spiffy little zoomer I’d like to have myself 
BTW: which one do you have; the 50, or 70.2?
I really like the sound of that UI. I’d like it if it also had double-click for turbo, the same as the Olight Baton UI.
Replacing the strobe with a battery check would make it perfect, but I understand that may not be possible and some people want a strobe mode.
I’d be happy to have the Olight Baton UI in pretty much any of Sofirn’s lights that aren’t running Anduril. In fact I’ve been meaning to suggest it for the SP10.
I have the 70.2, I actually buy a few 'cheepies' here and there and this is definitly my favourite.
Thanks, I’ll try one!
Update: I ordered one today and it looks to be just what I was after- a good, VERY cheap zoomy! It’s cool to get good referrals to BUDGET lights like this one. I seem to get stuck on the same stuff (Sofirn for one… and good stuff it is), but it’s nice to get out of the box an find deals in the corners like this one. I am not expecting anything but a $12 light here BTW. But it’s the $12 lights that are decent that “turn me on” for sure!
I’d like to see MORE posts like yours where we all can share the decent “el cheapo’s” out there. One never knows until someone takes a chance and posts it— thanks man! 
Thanks for sharing.
I like what I see in the first picture, a proper and more or less flat emitter retaining ring. The emitter should sit very close to the lens when in flood, doesn't it HenrysCat? I wonder what driver size does it uses.
Bad points, imho, are single hole at the 
tail for lanyard, and only ∅42mm head for such a long flashlight.
But hey! It's nice to see they are listing the correct capacity and weight for the red UltraTurd batteries. :-D
Yes the LED is right under the lens in wide, below I'm about 2ft from wall, if I step back to about 6-7ft it covers a good 3-4ft of floor and ceiling, so it's very wide.
Here zoomed in fully again about 2ft from wall,
And corrected, this is what you actually see, the pattern of the led itself.
I got one a few days ago. It’s cool!
This one has zoomie, magnetic tail, usb charging and ramping for cheapy.
does anduril is ok for this?
There is no ramping, it steps between modes.
so is it a steping mode or smooth ramping?
If anyone wants to try, found the stuff cheaper somewhere else: https://www.aliexpress.com/item/4000294614311.html
Also, nice sale price with the following link besides an (awful) different version: https://www.aliexpress.com/item/32960591645.html
Or maybe it is 0K?
Stepping modes.
I also have that one, not as good.
Oh man…so glad I only purchased 2 for $10.58 nzd each. I’ll just gift them
Thanks HenrysCat
Ill skip this light 