That is one nice first post. :)
As long as the driver could take it, I suppose that you could run either a separate driver for the MT-G2 or run one driver with the XM-L emitters wired in three groups of two, 2S3P if I'm not mistaken. However, the levels may not be ideal.
Some will probably chime in here and note that the TR-J18 is already pretty floody... but this is BLF, sometimes we do things not because they are practical, but just to see if they can be done!
Hi L4M4. you say you are a nearly collector. Does that mean you nearly have a problem? Welcome to the nut house and good luck on your mods.
Hi!
The heat is the only problem.
But I don’t use my flashlights very often - mostly just my SK98 @ NW @ Nanjg 2.8A to find stuff in my apartment 
This light will be on under 10 Minutes per week - I just like to have a extremely bright light.
@18sixfifty:
Have you tested this driver with this LED or are you assuming because of other problems with it?
My problem is, that I have no MT-G2 here - I would have to order one and I don’t have any other flashlight where this could fit - so it’s a 22$ risk 
But then I have them in parrallel - which means both get 1,5A @ up to 30V, but the one string needs ~20V, the other one max. 7V
Or am I stupid?
From the pure theoretical data it just has to work - voltage and current are perfect for this driver.
Other thing: If I would use an extre driver just for the MT-G2 - which one would you choose?
I have 3 KingKongs in the back, so around 12,6V at the max.
The KD Driver hat 3 Modes - any chance to make a slave driver for that?
Thanks a lot so far!
Sounds like a good approach for dealing with heat. I, too, plan to build a light or two where High can only be used for a short period of time. It's nice to have all that light available in case you need it. In my case, I will just use the lower modes for extended use and to cool down.
18650, Does that driver have a record of freezing on high running at 3 amps like the OP intends?
Yep it’s difficult to use a parallel/series style with different LEDs.
The problem is to guess which LEDs get which current…
So I am even more exited to see how it ends…
I have read also some post about this driver doing not what was advertised, I guess in one of the 9xt6 threads…
I have had four of these drivers I killed two of them. One with a 3xMT-G2 it was freezing up on high and then simply went dead. The other one I killed running a 9x the same way. I’m guessing you could get away with running one MT-G2 with no problems but toss in an extra 6 emitters and I think you will run into problems. I also killed two other IO drivers that use the same protection on the 3X. The 9amp one and the 3or4 emitter 5amp one.
Now granted it might take less power to run 6 XML’s and one MT-G2 but from my experience with this driver I wouldn’t bet on it.
I’m not saying don’t go for it. If it was me I would probably try it and see what happens. If it does work I would use it very sparingly.
I’m not sure what driver I would use as a slave because I haven’t used any smaller drivers on my MT-G2’s it would have to be a three mode driver that takes three cells obviously.
You could check out this thread on MT-G2 drivers and ask for advice on that thread.
Good luck I look forward to hearing your results. It sounds like a really fun mod.
Hi!
So, I got the 4 KingKongs and the driver 
But:
With 6 XM-Ls, the Low-Mode doesn’t work. Just flashes one time, then nothing.
It’s the “9 LED Series” driver, so I guess, the driver can’t supply the needed voltage, because it can’t reach that far down.
I ordered the MT-G2 today. I’m very curious, how this LED is and if it will work how I wish it.
If it doesn’t work, I still have one very good LED for some other flashlights to mod.
Good luck with this ambitious mod. 
What about wiring the xmls 2P3S where both parallel groups feed into the mtg2? That would give a effective Vf of about 13.5v. I wonder if it would be safe to direct drive such an arrangement with 4S KK's.
OK - The driver is no more.
I tested, how fast the flashlight gets hot and after ~1 Minute, it went off.
When I opened the Head, a little bit of smoke came out. So the driver is gone to meet it’s maker
I will try to get my money back for this shitty thing and than I will go for the LED Sender Xtreme R.2
Just one mode - but with PWM-in, so maybe an option.
This thing won’t have any problems with the 6 XM-Ls and a MT-G2 when I got it.
I have my tr-j18 with 6 leds and pwm driver, more than 60w
if I add in the future one mtg-2 this will be the way
one mtg2 in 20mm pcb will fit?
Hi!
No, I will have to cut it a bit - the original pcb is 16mm.
To your pictures:
I have 3*26650 KingKongs - and I don’t understand what these pictures want to tell me 
I would need the driver from a MTE SF-15 and mod it - usually, those lights have strobe or/and SOS - which I don’t want 
Hello again…
I just got the MT-G2.
Fits perfectly, as you can see.
And… it lives >)
Because of the dead driver, I ran it with my power-supply…
sick sick sick
Heats up in less than 1 minute - but that’s enough to show who has the longest penis
I aint going in any competition with you. How long until we see the beam shots? Love the mod.
Whoa, I admit it (albeit under duress), yours is much longer than mine. Looking real good. Best wishes on driving it. You are now in holy grail territory (i.e. quest for a reliable high current driver).
That giant beauty in the center and you let it be surrounded by XM-L ’s??!!
Shame on you!
But seriously, this thing is beautiful. Good job!
Wow, gotta see how this works out for you Felix. Got my J18 with 7 XM-L2 U2 1C's on SinkPAD's. But a MT-G2 in the middle with the 9X LED driver would be real interesting! Theory is it should work I suppose for the voltage demand. Let me know what you are planning on doing for thermal padding or potting on the driver - I tried Fujik epoxy instead of the pad it comes with, but not sure bout it.
Looks great and good luck with this.
LOL.
I like it!