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?
I’m looking at mode specs for the T4, specifically the low-high max 50% group.
“sub-option 1.9 (normal-flash 9 times) : tap the switch to select mode group 9 (1%、10%、50%)”
Whereas on other biscotti-like 12/13 mode lights, this is the corresponding description:
“sub-option 1.8 (normal-flash 8 times) : tap the switch to select mode group 8(0.1, 1, 10, 50)”
The discrepancy in index is due to another mode being slipped in. But where is 0.1% mode? Is that removed from the t4?
Thank you!
T3 & T4 do not have a 0.1% mode. IIRC the reason is that no regulator chips could be found with high enough precision for that.
What’s the status of 17mm boost driver?
Hi, do the lighted tailswitches work well with the s21a b35am driver and the 22mm xhp70 driver? I would probably upgrade the spring, but apart from that, is it compatible with those boost drivers?
Yeah, they work perfectly fine.
When the S2+ with MAO will be sold, i want to get one with the 519a 4500k and de-dome it. I really like the beam profile of my S2+ with the 219b 4500k and the 60 degree TIR lens.
But i’ve read that the TIR lenses are not optimal for a de-domed 519a.
What reflector should i go for, OP or SMO?
I had an S2+ with a dedomed 519A and a 45 degree beaded TIR and it was lovely.
Now that you mention it, i also have the 45 degree lens on my 219b S2+. I really love the beam.
Thank you, i will try it with the de-domed 519a as well.
Simon, will you consider selling the T3 host alone?