Put together a c8+ with 21700 bat and 5400k flat white 2mm(I think its called m21a)
Very nice throwy beam but more usable than flat white 1mm.
Does heat up fast with stock 4 mode 6amp driver.
Still waiting for ss bezel…
weight is little to high for edc. Normal c8+ is better.
Post #1000!
(at the moment)
Yoink
Did you use a centering and and where did you get it? MTN is out of stock
I got mine on the Convoy AliExpress store
Oh thanks found it, I was searching with the wrong keywords, centering ring and spacer and it was “gasket”
I also put together a C8 with 2mm WF a bit ago using convoy’s configurable linear driver. Did ~180kcd at the max ~7.5A.
As far as centering rings what I have done is just glue the XP or XM centering ring down on the MCPCB in the correct location. I find I can get it nearly perfect just by eye. I have even been known to use double sided tape in a pinch. 
Gluing it is better than using the 3030 gasket as it’s not always perfectly centered. Love the centering rings that are cut precisely for the led, not just a circle.
Nice to know. As it happened with my M1 with customized weird ramping firmware driver (current-limited to 5A theoretical by replacing the sense resistor stack), where the effective output current was a bit less at ≈4.75A. I also had to custom file a 3535 gasket back then, and ended up obtaining 101+Kcd on a cold start.
I am to build an M2 now, too. Reflector area wise, the M2 is 81.169% the surface of the M1. So, your build looks to be right as it is. 
Wed, 04/29/2020 - 06:48
What driver did you use?
How is that mcpcb being held down?
. Mtn.SRK 7135 driver 5.2amps at the LED.
. Thermal paste- Clamped-Thermal glue (very little)
. SBT90.2 and a mod’d Q8 driver is going to replace it soon…
Thank you
Installed the 2mm white flat into my L21A and get 1.35km at 1200 lumens ANSI. That’s impressive
Are you sure about the reflector size relationship between the m1 and m2? I was always under the impression they were much closer in ID/effective area…
I measure 25.6mm internal diameter for my M2. I believe the M1 is ~1mm larger. So that would mean about ~7% more area. Could you take an internal diameter measurement of the M1 please?
Nice results!
I have a L21A with 2mm as well.
How is your focusing and what driver did you use?
JaredM my calculations are based on reflector surface, which is proportional to r² or d² times height. This is where the 80+ish figure comes from (M2 reflector surface area divided between M1 reflector surface area). Reflector diameter and height figures taken from the Convoy store M1 & M2 reflectors' advertisement.
Barkuti, you mean r^2 or d
If I’m understanding you correctly, that is not the correct way to calculate the reflector area. It’s not the actual reflective surface area we care about, it’s the frontal area; the area apparent to a viewer far away looking straight into the beam. It is A=(pi/4)(D^2-d^2) where D is the large diameter and d is the diameter of the inner circle around the emitter that is not part of the parabaloid. Basically just subtracting the small circle area from the larger circle area.