Hi Simon!
I liked the Convoy M21C. Is it possible that you will make a Convoy S21A flashlight with an XHP70.2 emitter? It would make a wonderful EDC.
Ahem. Scrolling.
Either way, we’re done here.
I think your flashlights are awesome.
You’r doing amazing job of listening to flashlight community and delivering well-built products.
The only thing I would really appreciate would be addition of built-in USB-C charging.
I am backpacker who loves spending the nights out in the field and addition of built-in USB-C charging would mean I no longer have to carry battery charger with me.
Using my phone cable and powerbank to charge Convoy flashlights would make things lighter and simpler.
I would buy M21C with built-in USB-C in a heartbeat.
I would also love to see some camping-like flashlight from Convoy, meaning 3x or 5x LEDs + 21700 battery + USB-C charging
Bonus question to You Simon: Have you ever thought of creating 2x21700 flashlight but with design like Fenix TK35 - wide tube instead of long tube?
Best Regards,
Thomas
Are there any candela measurements yet for the M16/26C with the XHP70?
Id love to see an XHP35 HI in there too.
@trmgkl
Thank you for rating. M21C with side-button is currently being produced, using the Andurill-copy program. Unfortunately, there is no USB-C charging interface. I think I will add a charging program in the next version.
There is also a 3*21700 flashlight with USB-C charging interface. Similar to 4X18A flashlight, I don’t know if you are interested in it.
Adding USB charging to a flashlight is not really difficult, but poses its own challenges. Driver board space is often at a premium, and although there are a few linear chips which can do the job (maybe 2x TP4057 for ≈1A charging rate), variables like charging efficiency, power dissipation, watertightness and the need to engage the tail switch or use an e-switch need to be considered.
In any case carrying an USB charger and/or additional cells isn't really that much bulk, in my honest opinion. 
Convoy noob here researching a few builds.
Build 1: s2+ XHP31 HI
Can I get a XHP31 HI in a s2+ host? What do I need to order, host + driver + led on plate?
16mm XHP31 HI (going 4000k)
https://www.aliexpress.com/item/4000046195591.html
XHP31 driver (can’t tell is this the right size?)
https://www.aliexpress.com/item/4000046041955.html
Any other tips?
Build 2: s2+ SST-20
This one’s a bit more straight forward, looking at a 4x chip driver (is for a child’s torch).
Build 3: Astrolux XPL-HI C8 hack
I want to swap the cool XPL-HI chip for a warm one and a bit more spill, hoping I can retro fit in a convoy 20mm plate and fiddle around with orange peel/d-c-fix to get a bit more spill. Should I go all out and fit a XHP? I’m trying to convert it into a combo beam with a throw bias.
XHP35 driver is 22mm; you need 17mm. Pretty rare to get 17mm boost drivers, as the XHP is 12V.
(same for the C8; 17mm driver)
Mountain electronics has a 17mm boost driver, but it’s sold out for now and quite expensive. They’re one of the only ones I know of that makes one in that size. There may be others, but they’re the one I am aware of. You need a 16mm mcpcb for the S2. You will also need an appropriate reflector gasket.
Cool so XHP* are generally 12v and boost drivers generally don’t come in s2+ sizes. As I am a noob I will stick with XPL-HI/SST-20 for my first two s2+ builds.
You could do a sst40 or xhp50.2 3v if you want to make a lot of light. Don’t need a boost driver.
Side comment (no offense meant to Convoy): Lumintop EDC05C is smaller than S2+ and supports 14500 battery only — it uses XHP35-Hi and thus a boost driver, so it’s possible to have such a small boost driver, but I don’t think they will sell the driver only… not sure what’s the size of the driver on the EDC05C.
… a lot of low CRI light, which is a no for some.
There are other benefits of using a boost (or buck-boost) driver, and that is full regulation; i.e. output to the emitter is independent of battery voltage or state of charge.
The sst40 tints are a bit cool for this project but the xhp50.2 3000k looks very interesting. I don’t see parts for the s2+ though so guessing a level of wizardry above my skill may be involved?
https://convoy.aliexpress.com/store/330416/search?SearchText=xhp50.2
I don’t think Simon has the 3V 50.2 - cutter.com.au does though, but they only come in ~5000K or higher.
(3b0)
I haven’t seen a 17mm XHP50.2 driver though off the top of my head (6V).
As others are saying “3V” XHP50.2 emitters only come in above 5000K colour temperatures, and no CRI choices (KD has an 1C for sale, that's all I know).
It is possible to equip a 6V XHP50x in an S2+, but as others have said it will either require a ∅17mm boost driver (like a custom built GXB172) or a ∅20mm boost driver (H1-A) soldered to the pill with probably some filing inside (jensen567 did this, check: Buck and Boost Drivers, Testing, Modding, and Discussion (Pic Heavy)). I was once going to make a build like that, but decided that my H1-A (with 2R2 inductor; they :facepalm: downgraded it afterwards) would go better in an S21A (with ∅20mm driver cavity) or similar.
@Simon Mao
I’d love to see M21C with USB-C, I’ll keep waiting! 
3x21700 with USB-C sounds great, is this flashlight already available in you shop? What’s the name of this flashlight? Can You give a little bit more details? What LEDs are used?
Thomas
Yeah, I’d definitely “need” usb charging with any multi-cell (parallel) light. It’s too much of a pain to have to drag out the Opus to charge all the cells at once.
That’s why I pretty much mothballed my Q8s with the nicer/warmer tint and floodier beam, and have my DC7 with a somewhat yickier beam instead (cooler, throwier). And the Q8’s annoying O-ring that just wants to escape, makes it even more of a chore to have to open it up then reclose it.
All the new incarnations of the Q8, with ’351s and Andouille and all sorts of bells’n’whistles, if they don’t include built-in charging, I can’t justify getting one.
Anyway, point is, built-in charging for parallelled multicell lights would be a huge plus in my book, and almost a dealbreaker if not included.
3*21700 and 3*sst40
It will take a long time to put into mass production, MCPCB needs molds,Driver outputs linear constant current with temperature control,I can’t give much information yet,