prikolow and stephenk
They’re the same driver really, just with some fixes 
Good to know.
This is very interesting, I want such a flashlight)
I’ve got the L8 and the M3-C light in front of me now. I like both but the L8 is not a carry light. Would it be possible to build a new light with the L8 26800 tube and tail, M3-C head, 25 amp driver and use the SFH55 LED? And of course with the optional stainless steel bezel. Another idea same set up with a quad XHP-50.3 LED.
i dont have a plan to use SFH55 LED, sorry ,
seems no quad lens for 5050 LED
For the M21D with GT-FC40, what is the actual measured current draw from the battery on Turbo?
Also, what is the measured battery voltage once fully charged in the light.
Hello Simon! Is it possible to put a FC40 in the S21A host??
No. Simon does not make a driver that is compatible with both FC40 and S21A.
7070 sized emitters are somewhat overkill for 21700 tube lights. They will step down and be thermally throttled very quickly. A bit more thermal mass around the head is required.
The slightly larger S21D 4x519A is pretty close in performance to the FC40 in much larger M21 series lights, so maybe consider that.
In addition to the maximum mode, there are also lower modes, and many of them we use more often.
Hmm I see. Well. Thanks for answering guys. I just received a S21D with the 219b and I’m loving it! Best tint I own! But out of curiosity I really wanted to try the new FC40 in 1800-2000k but I don’t want a S11. Guess I’ll be going for the M21B. It is slightly larger than a S21A but not as thick as the S11. Also much more eye pleasing. 
The M21B will give you approx 25-30% more sustained lumens with the FT-FC40 than the S11.
If you really like that S21x sized GT-FC40, built one yourself. S21B takes suitable driver. Only thing you need to do, is to enlarge the reflector hole. You need to source 7070 centering gaskets from some other source. I know there’s 7070 gaskets for 9mm hole available (if Convoy sells S21x reflector with 9mm hole these are direct fit) and Simon probably could sell you his 10mm centering gaskets.
no suitable driver and too much heat
10A
4.15V-4.2V
Actually, 7070 emitters are good since they will be quite efficient at low power.
Ohh that’s way above my paygrade skill wise haha. I’ve tried to modify some lights, although successfully, it was a pain. I have a Texas Ace Narsil L6, a 70.2 converted BLF GT. I really want to change that 70.2 to a 70.3 HI. But I’m afraid to do a emitter reflow.
Reflowing usually becomes the simplest part once you get some practice. Just practice a little with something cheaper than xhp70. Feel free to contact me if you want some tips or just chat about flashlight modding.
Awesome! Thanks buddy!
Is there any chance of a 14500 H series?