Once again:
All Convoy S-series have 1.25mm pitch thread
All A6/S1/S41/S41S have 1.0mm putch thread
But half of A6/S1/S41 tubes are smaller OD. They dont fit S2+, if you will use small force to put them out without screwing they will fall down.
Could you please be a bit more specific?
Thanks, I had missed that post.
Sounds like a bit of a mess…
Sorry for the late reply. But thats not the question if the bare BLF A6 works with the E14 Head.
The problem of some black BLF A6 is that the threads are too short to reach the driver-retainer ring with its bare end to make contact with it.
The bare A6 makes contact on the threads, there is no need to have a contact between the end of the tube and the driver-retaining ring.
+1 for the mess :s :s :s
kiriba, thanks for your measures, now I am more confident that I will be able to lego the S41S head with the S1 parts how I wish 
by the way, I have just measured all the S1 tubes that i have:
1) the 18650 and 18350 ones that came with the box are very consistent measuring exactly the same, both at the tail and at the head side: OD 21,72 mm and 1 mm pitch.
2) Also the other S41/S1 spare 18650 tube from banggood (clearly from a different manufacturer or at least batch, since the anodizing is much more matte than the S1 one and there are other minor differences in the geometry) has almost the same OD, less consistent between the tail and head side but it’s around 21,75-21,80 mm (the bigger difference is in the tube ID though… with this tube protected 18650 cells tend to get stuck inside)
Thanks! 
you must be right this should be the only possible explanation… even though my S1 tube has 5 threads, and with 0.25 mm gap per thread that means after just 3 threads the crest of the internal threads will correspond with the crest of the external threads… no way this can be done smoothly I guess :s I’d rather say it should take quite some forcing to screw such parts together… too much animals around maybe :p?
Yes. The question was another
I think that answer was correct
Thank all.
Have just received S41 bare short tube.
21.8mm od, fits S41S head and tail perfectly. Still dont work with black S1.
I received my Astolux S41S from Aliexpress today.
It is the new version of the head. It is not glued and has the new Layout to prevent blue LEDs. :+1:
And it’s the old version of the driver. That means it has black PCB at the driver and the tailcap. On the driver I can read “ALEX WELLS”. The tailcap has space bigger resistors and I can Read “DL036_K6”. The springs are the same as from banggood.
It was shipped on New Year and is now delivered. Very fast shipping!!!
All parts of this flashlight are cheaper as on banggood including our codes.
I think banggood makes a lot of money with this flashlights and the high price on their website.
I have written some mails with the banggood-support. For the separate tailcaps they wrote that there is a different quality on aliexpress. Banggood will loose money if the sell the tailcap for $6 as they wrote first (before the tailcap was listet on banggood). But the wasnt able to tell me whats the difference in quality with the tailcaps. I am not happy with the high price on banggood vs. the better price at aliexpress because I have bought some of the flashlights, tubes and tailcaps.
Received mine from banggood and its superb! I might have gotten lucky but I have no problems so far with it. The PCB of the tailcap is yellow with two springs. Only thing is the oring of the battery tube is slighly too big so it get crushed.
Wow, that’s good news !
I hope the two units i ordered will be the same as yours. :laughing:
It’s strange though.
Some Astrolux products are much cheaper on Banggood, and some are much cheaper in the A.E. ‘Elfeland’ store.
And the prices fluctuate enormously too.
hi guys! any updated promo code for s41s?
Can someone briefly explain Astrolux S41 lumen levels.
I know max. = 1600 lu
How many seconds before it steps down?
Does it keep stepping down to moonlight or does it hold on a certain level below 1600 lu? I need 300-500 lu to remain on until I manually switch it off. Yes?
Do the step-down phases get longer or is it a fast rush down to moonlight?
thanks
AaLF
Flashlights with FET+1 drivers cant have constant regulated output more than 350mA. All modes over this current depends on many factors - cell internal resistance, springs and wires resistance, switch resistance, soldering quality, leds quantity and Vf, and cell voltage.
The S41-series lights automatically step down from maximum after about 35 - 40 seconds. They then remain at the second highest mode - about 800 - 900lm on my Nichia-equipped units - until the user changes mode, switches off or the cell runs down.
However, you should step down manually from that mode when it gets too hot, or you are liable to damage the light.
The next mode down is about 400lm and seems to be fine for continuous operation. I run my S41-series lights on 18650 cells and I can get a couple of hours at that level, although they do slowly fall over that period to about 250lm before finally starting the low-voltage stepdown sequence. 18350 operation would probably be more like 30 - 40 minutes.
Mine steps down from turbo straight to moonlight with 18650vtc6. It is strange because it doesn´t do that with 18350 Keeppower???
Yeah, it´s a very annoying bug in the driver. My original S41 made by Manker does not have this, only the newer “Mateminco” models. Depends on which cell you´re using, seems like on 18650 high drain cells it happens more than on 18350 cells even if they are unprotected high drain versions.
Ok, so it´s a common “problem”…My 18350 Keeppowers are unprotected imr ones.
Yeah, i just got my 18650 tube in the mail today, and i have the exact same as you describe (but i have VTC5 and ‘Enercig’ 18350).
Must say though, on VTC5 it’s considerably brighter and gets hotter much faster.