According to JaredM estimation the M21B (I’m not sure whether 6A or 8A) should do 105kcd, which translates to 2*sqrt (105000) = 640m. The C8+ with CSLMN1 should have 700-800m of throw, but much lower total lumens. Edit: ignore my C8+ throw estimation
If you increase your budget a few dollars, the BLF-D80v2 is really nice for the price, and fits in a pocket quite easily. 
@PiercingTheDarkness
Ahhh ok, I will ask him. Thanks.
@ggf31416
Thanks for information, maybe I will go with something less pocketable.
@raccoon city
SST40 or XPL?
You could always wait for the Astrolux EA02 
@PiercingTheDarkness
It’s to big for me I think. Don’t want bigger than M21A which isn’t pocketable.
A vote here for the M2+NM1. Runs cool enough at 4.3A and settles into a pretty sustainable 80 kcd while still being cool enough to hold. Really a slim light that handles heat very well. Comes with a (strong) pocket clip if you care about that.
M21B is a better host for bigger emitters IMO. Interested in seeing actual measured values and opinions from someone with both.
34-45mm bezel is an awkward size for me. Too big to pocket EDC, and so if its going in a bag or holster, you may as well jump to a 50mm class the way I see it. After 55-60mm, I feel a light should be multi-cell, so that really creates another big step. The EA02 looks like a nice size and configuration. Super deep reflector. I really hate that its a blatant rip-off of an FF design though.
For maximum lumens, I would go with XHP50.2, but it looks like it is no longer available.
https://www.aliexpress.com/item/4000333646371.html
Since that seems to be gone, I'd go with the SST40 version.
50.2 isn’t a thrower. With the thermal limitations of a host this size sustained lux will be worse than a s21b+pm1
You just said above that you might get something less pocketable
@PiercingTheDarkness
Yes but I mean something ~M21A sizes 
Anyway, thanks for suggestion. Maybe on photos it’s bigger than I think.
Oops.
I changed my mind about the BLF-D80v2.
At $27.70, it's a good deal, but right now it's at $37.70, which I think is too much.
Sorry about that.
I read a topic about this flashlight and for BLF member it should be 27.70$ (or it was months ago). I will try to buy it with discount maybe, which one will give me better throw?
Spend a few $ more and get a noctigon KR1
Actually $28 ($33-15%)
[quote=zamachowiec]
I like this idea I am going to do it to my M21B where do you get your dual springs from?
Zam get the M21b great size that’s if you have 21700 already.
I just use a single one of these over the top just don’t do this on the head in case it delivers too much current. Using the 30Q I measured 8.4A at turn on, the LED peaks at around 9.4 ish so 8.5A is fine. I’ve sold plenty and haven’t had a single issue. Not sure what you’d use for the 21700 though
Thanks for that just went to order the parts but cannot find the ramping driver?
I will add that the only reason I have dual springs is because it’s a gun light, stops the battery disconnecting with the recoil. A single one of those springs would be enough.
Installed a BeCu spring I got from BlueSwordM in the Sofirn C8F and that Convoy spring performed the same in it, so you should only need the single spring