Nice progress. 
Looking good YuvalS. 
Just completed the last two tasks: battery box cover and final assembly:
As I mention, the original battery box had the cable glad on the cover, since I placed a new cable glad I had to make a new cover from Perspex piece I had a home.
I also cut some rubber to waterproof it
And just wanted to make a new post for the final result pictures (with last year build too):
Now I only have to find a dark location for taking the beam shots
1 Thank
That looks so professional YuvalS. Lor have made a real sweet torch. I hope you can put it to lots of use.
Finally Moon is not so bright and I was able to take some beam shots:
The sandy ground and the vegetation appear to be like the southwest US
It is Caesarea. Had to drive a bit to find a dark place.
Nice finish YuvalS.
Very cool headlamp YuvalS. I like the different beam profiles, better than a zoomie in my opinion
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YuvalS, Sorry I missed your Finnish :person_facepalming:
Your light looks very rugged and ready for caving or anything you can throw at it.
Great job on your modification build, although it looks like a handmade build. The driver board from scratch is something only a few here at BLF have done, so much to know and successfully make happen. You worked and planned very well on your competition mod build. We all enjoy and learn from you guys who make BLF such a nice forum, Thank You :+1:
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Cool 
MRsDNF, pinkpanda3310, CNCman and MascaratumB, Thank you so much for your support and encouragement, hope my build helped and encouraged other BLF members to build their own caving lights or any other type of lights, I know I have learned so much from BLF members and the OL competitions, looking forward to the the final resultes of all the cool builds this year :)
Really nice build . Looks well thought out
Impressive effort with making your own circuit board and FW! I love these purpose-built tools. Also I find that when you are making a tool with a more defined purpose there are more constraints in the design process and I enjoy it more.
Caving sounds exciting. Can you give some examples of when you would use the different beams and how often you would switch between them?
Like everything related to lightning it depends on personal preference.
Some cavers combine Spot and Flood beams But I personally don't like to combine beams.
For general caving I use the Flood beam and only use Spot beam when have to inspect far object such as bottom of a pit or ceiling of a dome. When rigging a vertical pit for abseiling you have to spot very small anchor points so I also use the narrow beam but only on about 50%.
It is hard to tell how often I switch between beams since it is really depends on the nature of the cave. Some caves are very narrow so no need for spot beam at all and other caves have huge halls or deep pits so you mainly have to use the spot
Hello,
Great build before everything! 
I have few question about the battery box.
1)Do they rattle inside the compartment when you move around? If no how did you solve that.
2)Are you using unprotected 18650 and is there an issue if you were to put one fully charged and one not charged battery? I saw some thread on something like “current overflow so when there are 2 batteries in parralel they tend to equilize the charge state so the one that charges tends to heat a lot…”
Is it true and if yes did you approach to solve the possible problem?
3)Is it better to use plate springs or the normal springs for this application?
4)How do you pack it nicely when you pull it out for replacing batteries? I mean do you squeeze the cable that is coming trough the cable gland to the contact on battery holder?
I’m building myself a light from scratch (using dualflex driver) so I will post it on BLF when I get to real work.
Greetings
not yuvals, but:
2) do not mix charged and uncharged cells ever in series or parralel, theres not really any point to solving this, if you did it would be some sort of custom bms i imagine
- either is acceptable here as long as its a spring id imagine
1 Thank
It is barley fits so no issue with rattling. the case is for cells wrapped with shrink and I also add the plastic holder so it sits tight and not moving.
Yes, I am using unprotected cells (not that it makes difference in scenario of unbalanced cells in parallel) I have paired and marked my cells so always using the same cells together. In case I have to use cell that I don’t sure is fully charged I use single cell instead of two.
I have no Idea which type is better, I was not able to find a good one with decent spring on found this type on AE and it works perfectly for my needs with just little modifications
Yes, I am using relatively thick wires so it is a bit hassle and used a lot of hot glue to secure the wires so not polling the soldering off. Scurion is using a lot thinner wires so it is easier.
You can have a look on my DUO modification where I did not use wires at all.
On this build I have an integrated charger so not really need to take the cells out ever.
Good luck this is really quality driver but I don’t like the UI.