Minor update for 2017 version. New version now includes sling strap and tripod mounting hole.
And also upgraded CaroNite 26650 5600S from one of the sellers. Tempted to buy one more for mod, but I got 2 already.
This light is so heavy with 4 cells loaded; not suitable for EDC, even mid-long hour carrying 
In this 2017 revamp, did they make the threading better?
Vinh sent me a Modded Boss1. It has his programmable driver and does 570 kcd and 1400 lumens otf. Im going to order a UCLp lens for it so maybe ill hit 600kcd. That would be plenty.
I really like this light, Its so obnoxiously heavy its hilarious. I use keeppower 5200mah for this light so 20,800 mah lol. I actually perfer the shallower wider reflector as it makes the spill wide and the hotspot neater and sharper and larger.
These are my measurements taken at 10m. beamshot below is in order of list
1)Deft edc X Enthusiast 510 kcd(my card says 404kcd but I always measure much higher no mater how well I calibrate. I think Michel measures very conservatively
2)M25c2vnT (618kcd)
3)Bossvn 570kcd
4)K50v3vn (has xhp35) 535kcd
Im on cpf more then on here. Im on so many forums some just get more love then others lol. But I just love how far TOM E drives these leds. Never knew 1900 lumens was possible with xlm2 u4.
Im sure Vinh could do the same but I think he tries to strike a balance between power and reliability as he sells a lot of lights so this bossvn is kept to a still respectable 1400 lumens.
I hit over 700 kcd when playing with focusing of the dedomed XPL, but I know vinh can do focusing better than I can. I had it out on the 4th - it's impressive.
still those short threads?
and I would not ant t with those brass nipples instead of a ring
still a pass… (and I love lights like this, Tom lets do a Q10 making the wrongs in the Boss right LOL)
Wow thats amazing. I just inquired about an 89.80mm UCLp lens so that should help a little.
Ok, i received this true beast thrower and tried a easy emitter swop with XhpV5 and XhpHi with aluminium pcb with custom machined aluminium spacer but the current is too high on high mode resulting in blue light. On the med and low mod the XplHi beam is slighly narrower but its also dimmer than the stock xml2.
With the XplHi emmitters , the high current requires massive heatsinking like a machine out 75mm copper plate for or some resistor mod to lower the current on high to be workable. The narrower beam profile on the 90mm reflector is crossed and not very nice like the stock xml2. i think the only way to easy mod this light is with a dedomed high bin xml2 u4 with copper pcb which im getting soon.
I have a mini lathe and did considered machining copper plate for this light but the cost of machining the copper plate is substantial and might not be worth the work after seeing the poor beam profile with the XplHi on med and low mode.
A better but more complicated mod idea is with the XHP35Hi which requires 2s2p battery mod.
A even better , completely doable but pricier mod idea is with 4x xhp35 with 4 40mm reflector on 4 KD single cell 1amp xhp35 driver linked individually to the 4 isolated tab of the driver for each battery. This is completely doable due to the large 90mm internal head space and would result in a 6000lumens 4amp 4xhp35Hi monster thrower that makes nitecore Tm16gt a baby.
Uhhh - you really don't want to fool around with aluminum non-DTP MCPCB's - you will get the blues every time, if not burning out the LED completely. Is that what you are using? Copper DTP MCPCB's is the only option, I do mean only... Noctigon, SinkPAD, TPAD, etc...
You don't need crazy heat sinking if you do the MCPCB right -- DTP & copper.
Mmm fellows, you may want to check this out:
- 6V 20mm CREE XTE XPE XPG XPG2 XPE2 3535 Led Copper PCB
- 20pcs/lot 20mm Cree XPG XTE XPE XPL Led Copper PCB Board Heatsink Base Plate (4S, 2S2P and 4P variants available)
Related thread: 4x quad XP footprint copper DTP stars my dears! :-)
Nice behemoth, LoL! 
Hope this is of help. :-)
Cheers ^:)
Uhh, 4X quads are totally useless for a SMO thrower. ???
That's some crazy boards this seller has... Optics is an issue, potential big issue...
Oooo, Dtp-direct thermal path . im still stuck in the aluminium pcb era and this new copper dtp pcb is new to me.Thanks for the update. :+1:
Btw, I find removing the handle from the boss1 makes it a very cute monster. Very wholesome feel and full of flasholic satisfaction to hold this hefty beast in one hand without its handle sticking out. Its rare to come across such an affordable yet very high quality light with massive reflector throw and unlimited 4x 26650power. :+1:
We put in our boss
XHP 35 hi and LD M2 with 2,5A
Batteries seriall.
Nice Thrower over 500 KLUX and ca 1900 Lumen
Regards Xandre
Grats! This combo is by far at the cutting edge of led throw potential. :+1:
Another simple mod idea would be a 20mm 60w cxa2530 directdriven on 10xcr123a in 37v series but it would be a unsexy flooder. Well a future combined die cree xhp90 ‘Hi’ release would open up lotsa interesting possibility for boss1 potential 80wh battery power. :smiling_imp:
Hhmm - 500 kcd is a little disappointing for the BOSS1, considering it's reflector size. Interesting....
Does anyone knows the current on the stock led? how hard is it driving it? i cant seems to get a proper current reading on a sst50 and my stock led is dead. i guess it is at 4-5amp range but i have no way to tell yet.
The xml2 is not such a bad choice for this light after all since it can take crazy high current without turning blue like the xpls on aluminium pcb. The highest efficiency xml2 u4 bin could possibly give it a 1600 lumens max range when driven at 5-6amp, at 360lumen/700ma. The xml2 dedomed looks exactly like a xpl underneath it , given the large 90mm reflector and perfect beam profile with it, the only easy mod necessary would be a good tint u4 top bin xml2 on copper dtp pcb which is freshly avail on kd now. Well ,2 dead led before i get to know this…….
Well, you got some things opposite from what I know and understand. XM-L2 U4's cant take as high amps as a XPL - definitely. I smoked a dedomed XM-L2 U4 in my BOSS1, while a dedomed XPL V6 is doing fine. It's also been tested/proved here on BLF the XPL's can take more current. But again (big but), you absolutely must use DTP copper always when doing any DD'ing (Direct Drive, either straight wired or via a FET based driver). Did I mention ALWAYS? Yes - I mean no choice, must always.
I measured 6.08A across the switch using a dedomed XPL - 696 kcd. Then measured 1,740 lumens @30 secs even with cells at 4.14V.
I suspect amps are actually higher because I used a regular DMM - a clamp meter normally reads higher and more accurately.
My setup was direct wired with no driver, using 4 great cells: EFEST dark purple 26650 4200's.
Also fyi... I believe XPL V6's are equal to XM-L2 U3's, and XPL W2's equal XM-L2 U4's (seems to make sense to CREE specs), but XPL's can take more amps.
Well i dont have a conclusive test done and its just based on some fasttech V5 xpl vs stock xml2 aluminium pcb . The xml2 doesnt turn blue but xpl turns blue fast on the boss1 .That few v5 xpl wasnt nearly as bright as xml2 too so im disappointed . With copper dtp pcb thing could be different but there are also other vf and bin issues that affects . However i feel they are rather similar dies , my choice would be xml2 because they are more common from my sources. Naturally i would prefer whatever is better and brighter , smaller and cheaper when available. Xpl w2 ….cant wait for that to appear …. :sunglasses:
Thank for the update, now i just need to fix back boss1 to functional state again :+1:
Again , this xml2 u4 are already so bright and cheap ,it makes it possible to replace xhp50s lights which are barely reaching 2000 lumens in shadow jm35 light with added throw. but i have enough throwers already and could do with flooders. Well it just the modding bug acting up again. :weary:
Well, presuming an XP-L is made from an XM-L2 die fitted on a smaller 3535 package, all other things being equal, I would conclude the XM-L2 should be more abuse tolerant with better thermal dissipation due to higher thermal conduction area. Of course, if this is not always the case, other variables should be considered. 
Cheers ^:)
MrsDNF said here: https://budgetlightforum.com/t/-/37200/6
From memory 5.5 amps was maximum before they went pop. What the maximum current is on your U4 I dont know. I do know that the XPL are far better for running at high currents than the XML-2.
There's a few more of these quotes from very experiemced members - no point to continue. It's said, its proven, over and over again. No theory, just proven experiences, myself included. You don't have to believe us, but... The old XM-L2's, like T6's and U2's could take a lot more amps. The newer generation ones, higher bins, had a higher Vf and popped at lower amps. The XPL's hold up better, dunno why, no theories I know of, they just work better at high amps.
This of course is costs and availability aside. The XPL W2's are available at Cutter.au - been there a while. heard of other sources, I bought some from an Ali store but I really dunno if they are true W2's, they are good but could be V6's.