Sofirn C8F host. 21700 C8F Available

I too would like a short flat end cap

I’m indifferent about SS bezels. Sometimes I think it looks nice but most of the time I like the clean uniform look of non-SS bezel.

I got a build of Anduril working with the tail switch by un-commenting this bit of relevant code:

// dual-switch support (second switch is a tail clicky)
#define START_AT_MEMORIZED_LEVEL

In addition I had to use the following fuse value (turning BOD on?) to make it work correctly:

-U hfuse:w:0xde:m

Now, when I use the tail switch it turns on in the last memorized brightness. Basically, it acts like a normal forward switch but it cannot change modes or anything. It just comes on in the last memorized level it was turned off in.

Yes, it does bother me enough for me to pass on many lights when turbo cannot be memorized or just not in the mode sequence. Just doesn’t make sense to me. I only see it as a safety precaution. But we re all responsible enough so why make it more work for the user? Some companies are now even doing double click for turbo, and then another double click for brighter turbo?! That’s way too much work to get to the brightest mode.
I still like the double click to turbo at any time. But just make turbo memorized or in sequence. What’s the big deal with them. Some family members and friends don’t know about double clicking and just know to ramp up or change modes. So high mode will basically be the brightest mode for them, unless you instruct them.
As long as you can memorize turbo in ramping, then that’s fine with me.

I’ve seen those lights that make you dbl click for Turbo and then you have to pause, then dbl click again for Turbo S. Ah, such crap!

The Olight X7 and X7R has that.

With NarsilM v1.2 or v1.3 you can change the code (and then flash the mcu) to make the top of the ramp be less than 100. In this case it’s no big deal to me, you can do a dbl click instead of a single click to get 100 Turbo.

If you know how to reflash mcu’s or buy a driver from Texas_Ace or Lexel, then you can set the top of ramp to whatever you want.

All of my custom built NarsilM drivers use v1.0 or older so they ramp to 100%.

I’ve got the BLF GT, GT Mini and Astrolux S43S that ramp up to less than 100. I don’t use any of those lights very much so them not ramping to 100 doesn’t bother me.

The lights I use all the time I tend to set them at a mid level memorized setting and dbl click to turbo for short bursts.

The only time a see a problem is if you have let’s say a 3,000 lumen light and you want to set it at 2,500 lumen, but can’t because the top of the ramp only goes to 1,800. That might annoy me, but I can’t think of a reason I’d set it that little bit below Turbo. 2500 to 3000 is not a very noticable difference. Maybe if the top of ramp was 1000 lumen and I wanted to run it at 1500 lumen, then I might get upset.

This may not be perfect, but it’s still way better than non ramping UI where you have to cross your fingers that one of the brightness levels matches your needs.

The UI Anduril has the advantage of having a user setable top of ramp. That’s the best of both worlds. You can memorize Turbo and access it with a single click.

Does the Sofirn C8F 21700 battery tube fit onto a Convoy C8?

I tried reading through posts and doing searches. I can’t figure out if the older C8F or the 21700 version is being talked about.
Thanks for any help

Do you mean, does the Convoy C8 battery tube fit the 18650 C8F? Yes, it does.

A pic from Reddit.

The 21700 tube is obviously larger in diameter and does not fit.

Thanks for the reply. No. I mean C8F 21700 battery tube working with the Convoy C8 head. I know that bored out C8 exist that will accept a 20700 cell, with the o-ring being the thinnest part. So, it is close.

No, it’s not close. I’ll take a picture of the two later today.

I discovered that one of my C8F 21700 lights lacks a screw inside its head. Can anyone help me to find out the correct size of the screw I need for the center hole, i.e. the one that is behind the driver and that tightens the reflector and the MCPCB? M3 seems to be too large, so maybe it's M2.5? Is there a reliable source in Europe/Germany where to get the right screw?

I used this schematic picture to show what I am looking for. Thanks for any help!

M2.5x8mm

Mine is a cheap phillips head. If I reinstall the reflector, I’ll probably replace it with a socket head cap screw of some kind.

Whoops, looks like I forgot.

Here are the two battery tubes side by side.


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Hmm, I just posted something on the S11 thread, saying that the 21700 seems closer in size to the 18650 vs the 26650. This is kinda the proof I need. :laughing:

The c8f is not even a good example. Its way overbuilt and thick. A smooth tube light could have much thinner walls

Thanks for the pictures and update JasonWW. Wishful thinking on my part.

I noticed that myself. Hoping that the upcoming Convoy C8+ 21700 has some thinner walls. I don’t really see the need for the wall thickness. If your going to add weight, it would be better served in cooling the head.
It would be great if the C8+ 21700 body would fit into a 18650 C8 head. Maybe the dimensions are just too far apart.

That is too thin

Hhmm, 18<-->21 vs 21<-->26

Yep, 21 mm is closer to 18 mm then to 26 mm, 3 is less than 5. Math proves it also

I contacted your company via email on two projects and got no senior response.

Oh well……

FYI, Barry works for Sofirn and commented in your thread even. You are in for a huge disappointment and reality check if you expect constant and clear communication from these guys (nevermind it’s during a national holiday). Just set your expectations to this all the time.

Hi guys, i order c8f sec version with 21700, does anyone know how much power stock driver can put? I wanna change it with XP-L2 v5, wonder if they will work on that driver without modification, and is it worth changing XP-L? Thanks.