That’s what I really need. I’d like to tweak it a little. 
I’m using a xhp50.2 J4 5000k on a copper Nitro sinkpad (The BLF created first ever sinkpad).
I’m really not sure if I’m allowed to sell one. That be a question Loneoceans would have to answer, not sure of the licensing.
A giveaway I could do? I have 3 more boards and components ordered, when I get time to complete them, I could do a giveaway.
There are two more of Mountain Electronics boost drivers available:
By the way, I charged up 2 30Q’s and one 25R. I got 2800 lumens at start up and holds 2500 lumens for maybe a minute (didn’t time).
I tested the current draw with a 87V and it said around 13 amps but the meter gives me a error because the limit is 10 amps so I wouldn’t completely trust that.
This driver also works with a lighted tail cap, no modification needed. 
The stock switch also seems to handle the current fine for now. Part of that comes from Loneoceans firmware that ramps up from the previous level instead of just a full on.
Its like a soft start feature to each mode. Time will tell how long the switch will last at this current.
A GAW is incredibly generous, but I’m sure EVERY member on BLF would want to win so I’d be quite low odds to get it hahaha If you sold it what would be the cost? I could pay for your labor/time and you do the board and components at no profit.
I was racing in NC in 2006, I stayed in Apex, NC. I enjoyed it there, the people really made me feel at home.
Great work moderator007 to get loneocean’s awesome design to work.
I feared that this would stay a one-man’s project but thanks to you and clientequator and schizobovine this design slowly is getting available to the BLF community. And thanks loneoceans for making your driver public.
Being a modder at heart, I just can’t leave things alone. 
I changed the Feedback sense resistor last night to .00833 ohms, stock is .010 ohms. Current input increased to 15 amps with a meter rated for 10 
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My lumen tube reported 3100 lumens at start up with a 30Q and slightly higher with a VTC6. S2 gets to hot to hold in about 30 seconds from a cold start.
Not really a substained usable turbo , similar to a D4, but lots of wow!
When I run the math for power in versus power out the lumens seems low to me. I would think that at around 6 amps or more to the xhp50.2, I would be knocking on the 4000 lumens door. Maybe the other losses are adding up like the lens. I straight wired (no switch, no tail cap) the bat to the tube and get very very close to the same measurement as with the tail cap and switch on.
It sounds like you are getting in to the territory of needing a better high drain battery
Its probably fine when its nearly full though
I’m leaning towards this driver being better served in a 21700 host. More mass, bigger better less voltage sag.
Only thing I see is a Sofirn C8.
You could do a really cool quad too if it works well @ 12V, just need to wire the MCPCB in series.
Not the best host, by far, but I’ve got a mtn boost in an f13 with xhp50.2 and it fits the 21700 way better than 26500 ever fit. Had to do a 17-20 and a 20-22 brass ring, but it works great.
Beware, the shelf is paper thin on the f13. And the threads are way too fine. Decent host otherwise.
I was in the process of sanding the host down to fit an unprotected 26650 better, when I tried the sofirn 21700. I used a couple of the convoy squiggly adapters that fit 18650 in 26650s. Squeezed then on, no problem.
26650 hosts that will fit a protected cell will fit 21700 with simple safe adapters. 26650 hosts are also easy more prevalent.
Which brand F13 do you have? I think I saw several different brands when I searched.
I may just use a C8 since I already have a old one that needs a upgrade. It still has a old P7 in it for heaven sakes. 
It was a 900 lumen monster back in the day. How times have changed.
C8 heatpath is superior, IMHO.
But won’t take a 26650 (albeit loosely) or a 21700 with spacers (perfect fit). Here’s the spacers: https://www.aliexpress.com/store/product/18650-to-26650-ring/330416_32679888604.html?spm=2114.12010612.8148356.3.25ba7db68jRPel
I’ve got the ultrafire variant. This guy: https://www.fasttech.com/products/5273900 It’s “ok” as far as hosts go. Convoy has me spoiled with the awesome threads and fit and finish. Ultrafire feels cheap, comparatively, in every way. If the 21700 had not fit, I might have scrapped it. Was getting to be more time than it was worth to properly fit the unprotected 26650. Was just too long a battery tube. Springs were loose. Shaking the light you could feel the battery moving towards each end. Smooth reflector is about right with the beamshot in the ad for it. Nice round hotspot, well defined, with a less dense corona. OP would have been way better, but i haven’t been all that confident in what i think i sourced from KD, so i never ordered it.
I also have a clear convoy c8 with the MTN boost driver and 50.2. Handles the heat surprisingly well. I love that emitter in that light. OP reflector made it just about perfect.
Also tried it in the M1 with the same driver. And a s2+ too… Happy with both. Swapped the 50.2 for a 70.2 in the m1. DANG. If you’re thinking about it, do that. More floody, a bit more output in comparison.
Had to ream the reflector out a bit and add some kapton tape, but it was worth it. I ordered a few 70.2 gaskets. I’ll remove the Kapton and fit them later on.
The extra power of this driver would be awesome, but i’m not ready to flow a whole board yet. MTN has us covered in the meantime with his boost drivers. If the 20mm kicks out more power, i’ll be all over those too.
If gxb172 in 20mm version exist (it look like loneoceans have it, but I don't think he has the pcb released yet?), then it would be good for another flashlight which take 20mm driver! Mr. nkresho, is the f13 light a 20mm driver use?
From the third pic from the right at fasttech it shows a retaining ring in the bottom of the head, its possible this fits a 17mm driver.
Nkresho can you check the measurement to confirm that.
Wait a minute he said he has a mtn (17mm) boost driver in it now, so yeah 17mm fits.
I put a mtn boost in a convoy m1. Before that had zener 2x18350 fet. Used a 70.2 and a step drill bit to open reflector. Gave it away as a gift but i really liked it.
Nope, mine won’t fit a 17mm driver. It actually falls through the aluminum retaining ring. I used a 17-20mm adapter inside a 20-22mm adapter.
You could also try a Nichia 144AM build
Thanks for letting us know nkresho. It will fit just needs two adapter rings. 
Just to give some perspective to just how tiny this temp sensor is I took a pic with a 7135 laid out beside the temp sensor, most people know about how small a 7135 is. I can’t even see the reference dot without magnification. I held the actually board up to my screen and measured the width, this pic seems to be about 7 1/2 times bigger than the actual size. Split that temp sensor in to about 7 parts across 7 parts up and down, take just one piece, and that should give about the actual size.
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Made a copper stud for the driver for a better less resistance connection.
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