False start
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I’d love to have it in M26D
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Offsides! 
I don’t really understand what that means, is that another custom mcpcb size? What’s the problem with 20mm copper pcb?
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It depends on how you use it. For me, Turbo mode is a blessing, allowing me to get more out of the flashlight than its weight suggests. With a 4-LED headlamp on, I use the Turbo searchlight to illuminate a distant object for a few seconds (for instance, when I spot 2 eyes in the darkness). The headlamp and Turbo searchlight have been my favorite setup for years.
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My wallet is ready for the M26K! 
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100%. Each of us has different reasons for why we buy certain flashlight. It’s called “use-case.”
Personally, I have one more reason for flashing the 20000 lm kind of Turbo: because I like it. The wall of light effect is beautiful to me. But I understand others have no use for it. 
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I kind of already Lego’d one together using my M26D body, M21J head, and M26C switch 
Edited the switch part, i used the M26C switch
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Awesome !.
Does it all properly fit together ?.
I have just asked Convoy if they can make me a 2S2P Nichia 4*519A Convoy M21H because they have a 4x219 option on the website.
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Everything threaded together perfectly, i will say though that i don’t run this light higher than 10% as the K62 that’s in it only has 15A CDR.
Good idea; please post his response. I’ve always wondered why Simon doesn’t offer 519a in M21H. Does 519a generate more heat than 219b when both driven with same driver/power? With the 4 LEDs together in a small space that’s the only reason I could think of.
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A while back, I was thinking about a new UI for flashlights with a tail switch (like the S2+). The 12-group driver is inconvenient for me, since the strobe/battery check functions I need are in the main mode. I like the reverse feature in the BLF A6 driver, so I adopted it from there. Btw, my Ekoras R7 also has reverse movement, but only when memory mode is disabled. I also have Manta Ray flashlights, whose driver activates turbo by double-clicking and strobe by triple-clicking. And I had no problems with accidentally turning on these hidden modes. So, the ideal user interface for me looks like this:
1 full-press to turn ON
1 half-press (<0.5s): Moon-Low-Mid-High (w memory function)
2 half-presses (<0.5s): Turbo → 1 click (switch to main mode)
3 half-presses (<0.5s): Strobe → 1 click (switch to main mode)
5 half-presses (<0.5s): Battcheck (voltmeter) → another 2 clicks (Biking-SOS-Beacon-Battcheck) → 1 click (switch to main mode)
10+ half-presses (<0.5s): memory function on/off
Reverse function: do a long half-press (0.5-1.5s) to go High-Mid-Low-Moon
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The 519A are actually more electrically efficient than the 219B.
BTW, Convoy said yes.
They are indeed willing to add a 519A option.
Now the question is: will it use the boost driver or buck driver?
If it uses the boost driver, I will buy it immediately.
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Wow - great job. I can’t believe it’s that easy; you just have to ask! I hope @Simon_Mao will make 519a option for M21H appear on web site very soon.
The only Convoy I have with quad 519a is S21D, which runs super hot because of poor thermal regulation. AND over time its TIR optic likes to auto-decapitate the domes off 519a (at least mine does, Simon has said it’s from the tight TIR fit, or something to that effect).
I’ve been looking for a S21D replacement a long time. Buck or boost I will buy one!
2S2P in the M21H or even better this M21K would be awesome. I would probably be willing to put up with the side switch UI for that.
My S21D sees a lot of use around the farm. Tint, cri, lumens and flood. Durable. Its only drawback is lack of thermal performance. Sustainable lumens would be the icing on the cake!
I particularly like that the M21K doesn’t appear have a usb port. Thats an Achilles heel in the rain and mud.
519a 5700k dd is the ultimate outdoor tint for my purpose imho.
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The description says it does have usb.
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So it does. I missed that 
. Oh well… I’ll still get one in a quad 519a if it happens.
There is a tread here I wrote months ago about this platform. BLFA6 menu is better than 12 subgroups.
I wait implementation of this feature or he change the menu because I need backwards option for levels, check battery..the Lux RC 371 has double click for the top level and backwards to come back. Very cool feature
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