What size is it?
Kaidomain carries a lot of boots.
Today answered :
Thank you friend
Yes, a driver for C8F-21700 is available, i will do a new link of it
Any news about the flat tail?…
Nothing yet. But I got my “thank you” C8F pack from Sofirn yesterday. It is a full pack 21700 version with battery, charger, 18650 tube. It has some issues but I contacted them and they are on it. Also as the low output problem of some lights. At first I also measured 2550 lumens with 18650 battery at first try but it was not completely full. Now with fully charged Sofirn 21700 it makes 3102 lumens. Temp regulation works fine. I measured 54°C on the head maximum and it stayed there while the light was adjusting output slowly down. My only negative now is the ramp characteristic. It maybe linear to current but not linear to the eye. The low side going up fast but the upper half barely changing. If they make an exponential curve to that like Narsil it will be a very good firmware.
Also like how they solved the two switch operation. It remembers the level and also if you leaved on or off with side switch. So when you press off and then On the tailcap it came back at any level you left or in a standby/off state.
So if have some issues. Don’t worry! It will be solved
I still haven’t got mine. It’s almost a month now. I hope it didn’t get lost. The last tracking date was Sept 2nd in China and then nothing.
Oh well, hopefully it will just show up. Lol
I used my 21700 C8 last night on my Thursday night walk, the Samsung LH351D in 5000K 80 CRI looked really good in the night and the power level was really good as well. Enjoyed it a lot, sure to be a favorite among my user group and will make it harder to decide which light to grab. 
Has anyone tested the temperature at different brightness at room temperature?
I have a C8F 18650: in 1500Lm its temperature is less than 55C, at 800-1000Lm and turbo 2500Lm after 20 minutes at 58C, at 650LM in 25minutes 55C. It turns out the most effective mode of 1500Lm and 2500Lm.
And how does the C8F 21700 behave?
I only tried turbo stepdown yet on my 21700 version. It stabilizing at 54°C
Made a test on the next level under turbo. The next level after that is about 700 lumens so I think there is no stepdown from there.
Does anyone know if Sofirn will have the new C8F hosts without branding on offer? I saw that other C8s are available on their store aliexpress page without engravings and that would make that host much more appealing
a few of us have already received the hosts and they did not have any branding on them. However, no promises in what you will receive.
Great news! Time to build my first torch then 
Remember that you need a driver that takes an e-switch. The e-switch in the Sofirn C8 host is mounted on a board and held in with a threaded retaining ring, it’s all installed when you get it with the wires sitting loose in the head. But you need a 21mm driver that takes an e-switch. They provide the copper MCPCB that mates up to the reflector, you’ll need to reflow emitter onto it… XP footprint.
And yes, my host is unbranded.
Yes, I did gather all that information, reflowing emiters onto the MCPCB would defo be quite challenging so it might not be stupid to ask someone for help with this later.
May I ask what drivers did you get for this build?
I apologize. At full 18650 1500Lm almost does not differ from the turbo, heating more than 800-1000Lm.
I built an Anduril driver with an ATTiny85 MCU and FET+1 set up, used a 17mm driver board from Wight, the A17Hybrid-S, and adapted it up to the 21mm opening.
Just got an update from Amazon US…it says it will be here Thurday…YAY
Being budget-minded, instead of purchasing a 3rd 21700 cell, I will use the 18650 I already have.
Yep, I’m glad I found this, I thought WTF is going on? :person_facepalming: The driver is a POS! The lumin output in all modes creeps up and the higher modes even more slowly, as do the amp readings. Took forever to get the highest amp/lumin readings? Best I got was 2440lm. at Turbo and 6.43amps, using a 30T with an 8awg jumper wire, not the cap. With the cap it was like 2100-2200lm. :cry:
But I bought it to tear it apart… so meh…Truly love the build quality, it is outstanding! :+1:
I got mine also…when u hit Turbo…it creeps up to turbo like the post above…im unsure the lumen measument.