Had some time to build a test sample of last project (forgot to mension this earlier. Lets call it C8TT).
I dont have various of leds and cells so I used old V5 XP-Ls triple driven by 20R cell directly. I dont have regular C8 triple in hands so I could compare it only with X6 triple. Im still not sure that using fet based driver is good idea to show heatsink improvement, please use constant current driver if you can.
I dont think that otf output is good value for flashlight measurements, in most cases this numbers are useless unless you are wearing gloves.
I cant take thermal images or any presicion measurements so I can only share my feelings for now.
Calculations dont show big surface area difference. I wont say how much extra watts can dispread this fins but this is not main achievement.
Right combination of fin thickness and tube wall thickness gives great temperature difference between head and battery tube. This allows to heat head as hot as possible for leds life, and hold the light for the same time.
I left flashlight turned on for 5min and take it after and dont feel it hot, then hold it in hands another 5min without any problem. I cant repeat same with X6.
After I turned it off I put cell out (it had 3.6v left). Unbelievably cold. When I put cell out of 10min working X6 (or even single led A6) I never though that cell high temperature was caused by led power. Surely I had to calculate this earlier, but actualy 6-8A is not big stress for low-res cell.
If you need, I still have one spacer for it.
Recieved mine today, gave it some polish and now it’s good to go 
Today received my package from kiriba-ru! Packaging was perfect. Thank you!!!
EE X6 spacer and optics. Excellent 
PM sent about convoy s2+ pills.
Any plans on those m2 quads?
Yes will restock them in 2 weeks.
I had never got anything shipped from Russia. Just checked my tracking number, and man it does a lot of moving around in Russia lol. There is 19 tracking updates and its still in Russia.
Dont take this as a complaint, I just thought it was funny to see so much updates with so little movement
It is OK. It took 5 days to export, much better than 2-3 years ago.
This is how it looks … :sunglasses:
Did you use the existing driver?
Is it GITD paint? Or tritium?
Yes, GITD powder + tape and yes is the original driver.
So I really want to dip a C8 host (either black or clear) in lye and remove the anodizing after seeing an S41 stripped down that way. I bet it would look pretty cool with kiriba-ru’s custom head.
-I can not send pm to you
The VG10 drawing is good.
Please send me the paymant details :+1: -
edit
in the meantime, succeeded
I have ordered several times from kiriba-ru over the past couple months all packages have been packaged nicely and arrived in a timely manner. Machine work is great and prices are even better. Thanks kiriba-ru I will post some picture shortly.
Is the thread for the tailcap on the BLF Q8 one of the standard ones you can make, or would it be a special unit please?
If possible, I’d like to discuss making a custom tailcap for this light.
I had plans for custom Q8 tailcap, I wanted to make longer one to fit reversed tube in 2S2P mod. I passed this idea. Q8 tail is not something that I would like to made in small quantities.
No problem - thanks for the quick reply!
I finally had a chance to open the package I received a couple days ago, everything was very well protected as usual.
Very nice machining on the s2+ pill, and the thin retaining ring looks like it will have no problem clearing any spring-side component. The X6 spacer fits very snugly in the head.
