Do you already know what optics you would like to use? It would be great if it was compatible with Yajiamei optics.
For example with this:
Frosted Yajiamei optics
This is PERFECT EDC flashlight of 21 century: https://translate.google.com/translate?hl=lt&sl=ru&tl=en&u=http%3A%2F%2Fforum.fonarevka.ru%2Fshowthread.php%3Ft%3D31892
If you can build something very similar only for like 30$ or just get right driver :https://translate.google.com/translate?hl=lt&sl=ru&tl=en&u=http%3A%2F%2Fforum.fonarevka.ru%2Fshowthread.php%3Ft%3D37158 I”ll will buy it ;))
Did I get it right?
the first link talks about a headlamp with Hi CRI XHP50+ Carclo 10140
the second link is a H02 and H03 with a custom driver?
I’m assuming “kk” is tap, and “dk” is hold…
I see everything rhymes with AK 
cheeky breeki
I like the frosted lens idea! Will it be available to buy on your aliexpress shop?
Um. I don’t decide which one yet. It is easy to buy them in China. I will select the appropriate one.
it’s easy to find them in China ,what degree do you need?
Then, my suggestions for 20mm × 12.8mm Yajiamei optics:
Clear surface:
- all of them should be checked for each unique LEDs to be used with, because beam artifacts would be visible depending on light emitting surface shape and textures
- also, less suitable to mix tint of the LED
- 5 degree variant gives the most throw
- negligible spill outside the hotspot, most of the light is focused in the hotspot (or there is a small corona as well)
Beaded surface:
- handles the different LED emitting surfaces very good, mixes tint better
- negligible spill, but it is a bit more than spill of the clear surface, also, slightly textured
- my personal choices: 10 or 15 degree gives very good throw; 25 degree is the best for general usage; 38 degree is a bit floody, above that, definitely floody, but still defined hotspot
Frosted surface:
- handles different LED emitting surfaces very well, even the worse ones (best tint mixing ability)
- much more light is present in the spill
- my personal choices: 15 degree gives a nice, conical profile gradually strengthening hotspot, 30 degree is already noticeably floodier; 85 degree feels like an extreme flooder (almost no hotspot perceived)
I regularly use Yajiamei optics in S2+, so my recommendations would go for:
flashlight: 10 and 25 degree beaded, 15 degree frosted
headlamp: 38 degree beaded, 30 degree frosted (also, 60 degree beaded and 45 degree frosted, if more flood is required - e.g. for close range hand work)
I do not know how to explain, translucent.
For S3, C8 and S11
Nobody discussing the most important issue. Headband color!
I vote for black band with gray “Convoy” text, please use the font from the s9/mk.
+1 
update
2019/3/16
unfortunately,i didnt get SST40 5000K
ramping driver is ready
here is the link of flashlight
black C8+ with SST40
non-flickering
modes
Looking good any C8+ 21700 soon ?
I like the demo video! But i think it’s wrong… it starts in third mode, shouldn’t this be first mode?
Simon the S11 is a nice size. Easier to hold for me and offers some more heat sinking. The upcoming 21700 S2+ will be sure to please. I wanted to share that a 20mm driver would fit into the driver ring if it is flipped over and soldered. Thanks.
Any update on the 22mm to 17mm adapter?
Comrade Tamagotchi has a great selection of different drivers!
What kind of driver is it in the non-PWM C8? Adjustable current linear? Buck?
I’d really like to see some of these warmer/neutral SST-40’s. My Astrolux FT03’s are delayed. Anyone selling bare emmiters?