Air Cooled 4x XHP50.2 UPDATE: Videos, Willing to sell

such an innovative way, very nice mod.

Very nice! :+1:

Really great build and I also like the looks.

Amazing, very nice :+1:

Extremely nice and effective build! :+1:

Great build!
Would you mind to elaborate which SRKs you used and how you connected the tubes?

that’s way cool!

beauty and the beast….thanks for showing off :beer:

I inserted some 3mm screw rods in the exsisting holes of the spring board and let them stick out around 12mm as you can see on the picture. I then drilled four 5mm holes roughly at the appropriate spots at the second tube as you see on the same picture. 5mm allows some room to play and find the perfect fit. I filled the 5mm holes with epoxy and placed the tube with the screws on top of, with the screws being inside the epoxy. After it hardened they became inseparable. I suppose if i heat the pieces a lot and melt the epoxy I can separate them if needed…
The SRKs I used where the cheapest I found on aliexpress that had the smooth type tube. Were around 15-17 dollars a piece. They are I think 10 or 11x XML (they had fake XMLs so sacrificing them was not a problem).

Thank you all for the kind words.

Fantastic build!

Cool build. Would be nice to see more pictures if you have any. :beer:

Absolutely awesome build!

Wonderful work with that heatsink and active cooling. OL would be proud! :sunglasses:

How long can it run on turbo with the fan speed set to high?
Got any outdoor beamshots at turbo?

Thanks for the info. So the electrical contact for batt- is done only by the 2 tubes connected with epoxy? Since I have a somehow similar mod in my mind I wonder if over the time the pressure between the 2 tubes decreases and the contact resistance rises.
The tubes are nice, they look similar to the Q8.

Deserves a bump.

[quote=Flashy Mike]

Yes you are right, over the time it could happen. You also need to have both surfaces very smooth and gapless before gluing , and use some weight while it hardens. The current doesnt flow through epoxy and the screws but through the exposes aluminium where the 2 tubes meet.

Now if the tubes loosen with time and I lose contact, a possible solution is to drill one or more small holes exaclty between the 2 tubes(in the gap) and insert a short piece of singe core copper cable or similar conductor (with a tight fit) to reconnect the two parts.
If you find a conductive epoxy, it would be the best solution in first place…

To the other memebers asking about temps and beamshots, until now I didnt have the time to use the flashlight enough. I will try in the next days to do it, and write back.

my reaction was WTF :open_mouth:
same as the brand of the fan you use

There are other techniques that assure electrical contact between 2 SRK battery carriers.

They can be threaded on one side, pressed fit and pinned together with roll pins (4) of them and then epoxied.

You are right! I have done this in another 8 cell project, the last one in my signature. Its 1s8p with 2 tubes. This time I wanted to avoid the conencting ring for a smoother look. It is more practical with the ring though, as you can unscrew it if needed.

You can still roll pin, or get really fancy and use brass pins, and on the PCB side, use the 4 PCB mounting holes, drill them out for the pins, press together and epoxy. You just have to drill and tap M2.5 or M3 for the new PCB location on the one end.

Well we need a BLF Museum of Fine Flashlight Art! :wink:

This one needs to be in it!! :heart_eyes: :+1: