The XHP35 is actually 12v only, so sirius is planning a 4S setup
What's the thrill/advantage to something like a XHP35 HI? Clearly it would have more lumens, take more power than a XPL HI or dedomed XPL, dedomed XM-L2, but would it throw any further in a big reflector compared to a dedomed XM-L2/XPL or dedomed XP-G2? I didn't think so because of the bog surface area, but dunno.
I remember one person in the homebuilt contest was not happy with how the 35 performed, so much so that he turned a brand new head on his lathe to use the XHP70 instead. Search ‘Arc of Josiah’
how about replacing the whole original contact board ? I mean making a new contact board from a PCB and then just glueing a thin copper (or any other) washer to it. That should provide plenty of connection with minimal resistance and soldering wires (either to direct drive a led or for a driver) to the negative (the rim) and positive (the ceinter) part of the board would be easy.
Just topped off the cells to about 4.22v, and did an outdoor 10 meter measurement and got 645 kcd (1606 meters, 5269 feet), 11 feet short of a mile 
. After the test I measured amps across the switch and got 6.25A. Previously I measured 5.95A and 635 kcd measured at 5m indoors, but since then I applied NO-OX-ID to the soldered up banana connectors, and freshened up the DMM lead ends, so probably got a bump in the readings. Got a UNI-T 210E clamp meter on the way, and also looking at building up a 0.01 ohm 50 watt resistor in a test fixture.
When the UCLp arrives, should be about 700 kcd then.
Give me the dimensions, I can draw up an Oshpark board
Kinda missed the part that XHP35 is 12V only, doh, thought it was a 6V like rest of the XHP family.
Also, can’t find that thread atm, but new single cell boost XHP driver is on the way, for 6V leds of course.
Idea behind the XHP35HI was to get more lumens than you would get with XML2, a bit wider beam, but not to lose on throw.
The threads have been a concern of mine, but maybe I'm over worried. I just threaded/unthreaded the tube with cells in it about 4 times this evening, and took a picture afterwards. What I thought was new wear and rubbed off anodizing turned out to be wrong - it was there when I first got the light. Didn't realize it's been like that from day 1, til I looked at the picture.
Also, think I'm getting used to it now. It's important to go CCW first to get it set right, then start tightening.
Mouse-over: latest pic from tonight (better focused), mouse-out: original pic from 1st day
Sorry for the pics, they don't line up well in positioning, lighting or focus. But think you can see they look pretty much the same. I tried to find the exact position showing the first flattened or square thread, then the 3 more pointy ones. You'd think it's from wear but it's how the light came.
I think the first flattened thread is done that way intentionally - it's even got an angle to it.
could you post some beamshots?
Hhmm, I'm not set up very well for beamshots, but I could see what I can do maybe this weekend. I'm assuming you mean real distance outdoors, not white wall shots? For outdoors, not sure if it's worth much without comparison shots. On Long Island, there isn't much in available open spaces, accept maybe at the beach's, and the beach's are pretty restrictive around here, more so at night. Over water it would be cool, but public access to docks and things are usually lit up too much - we have lots of light pollution here as well. Bout all high points of buildings and such are also lit up pretty good, no terrain to speak of, things are pretty flat.
Thinking maybe if I can find some power lines, towers, a water tank, etc., light pollution and access though... Probably can do trees at 100-200 meters - need to figure something out.
Could you also compare a dedomed xm-l2u41c and xp-g2 with this xp-l led? I ( and surely many others) would like to see the difference between them.
Me too, I'd like to see all 3 compared side by side as well 
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Can you please pm me the link to the thread about the boost driver if you found it?
I recently found the Solarstorm R60T. It seems to be pretty close in size to the BOSS, but I couldn’t find any reviews on it
My second BOSS1 from Tao Bao modified with XP-L HI “V5” 3B from fasttech, unluckily not a V5; which only produces approx. 950 lumens under one fully charged LG HE2. (under the same DD, KD’s XP-L V3 1C I had before produces >1100 lm)
BOSS1 (left ~900 lm) compared with TM36 Lite (right ~1200 lm), same distance; BOSS1 beam measured with slightly higher intensity (3 %) at 3 meters distance.
My TM36 Lite only produce approx. ~1200 lumens (although LCD shows 1800 lm, my 18650 parallel not able to push upto 1800)
Thanks, pretty amazing results. I’m sure it will beat an stock tm36 lite with a more extended build and using 4 batteries.
BOSS1’s reflector may be not as deep as TM36 or even TK61, but what I discovered is the beam angle is nearly 0 (zero). At shot distance (3 m) the beam spot is similar to TM36, but when shooting far at ~200 m the spot is smaller than TM36.
The wall is approx.110m away. Both photos taken by iPhone.
Dude! That pic is BADDDD for my pocket! ;(
Well, here it is for $55: http://www.gearbest.com/led-flashlights/pp_294539.html, seems like it was added yesterday.