I dont give up on xp-g2s yet, these leds have outperformed both xml and xpl emitters in terms of throw in virtually all other flashlights, it is very unlikely they do not work in this particular case.
696 kcd max, maybe a steady 685 kcd with the UCLp lens, measured at 10m. 685 kcd is 1655 meters, 5430 feet, 1.03 miles.
One sort of problem - I measured the stock lens at 89.6mm x 2.04 mm and it's a tight fit. the UCLp I requested was 90.0 mm, and measured precisely with my digital caliper at 90.0. All UCLp's are shipped with this blue plastic protective stick-on coating, so with the coating on, I used my rotary tool and brought it down to about 89.80 mm, then it fit fine.
I was hoping the 2.25 mm thickness of the UCLp would tighten things up (0.21 mm thicker than stock), maybe get a better focus, but it had the opposite effect - initially with it all tight, I could not break 600 kcd. Loosening up the bezel bumped it up big time, so it seems like the best focus point is a little further out of the reflector, not further in, if I understand the dynamics. I may need to bump up the height a little now - could use a stick-on type of ring - the 3M type, that the centering piece can sit on.
Hoping I got time for this but my plans would be:
- put copper extensions on the MCPCB pads to clear the reflector base
- add in a driver and use 18 AWG LED wires
- I got 2 brass screws holding the shelf down now - add 2 more, total of 4
It's not an ideal heat sink setup, but it seems to be working pretty well. There isn't much output droppage in short runs.
Well, a regular well focused FT S2 1A( the cheaper one , they have too s2 1a in their store, the cheaper is the better) driven at 4.4 amps gives like 10% more cds of the XMP/XPL champion at 6 amps - V6 1D( still havent tested V6 1A/V6 2D) a hard driven s2 2b is maybe >25% better, you can see the difference even with a naked eye and its an observation of literaly dozents builded C8s
That “thing” has been ordered ofc 
Cant miss it, it could be made a great search light, great indeed…too bad onone of the GB codes that i have worked 
Yea, I'm taking a big chance with the FT XP-L V6 0D, but seems to be performing well.
Measured amps again and I'm getting 6.08A - this is after I cleaned up contacts of the DMM wires and banana plug connectors though (before I got 5.95A), but cells are as-is, not freshened, when I did my throw measurements this evening.
Mitko - cool you ordered one! Love to see your thoughts and results. Certainly should hit over 700 kcd, and running a dedomed XP-G2 at over 5A I would think could hit over 800 kcd.
Looked at it - interesting, more like a classic SRK setup. Hope those are screws holding down the driver contact board, and hope it's not glued - I don't see a driver retaining ring. Kind of pricey, but of course it's a SolarStorm so maybe decent quality, plus all those emitters, side switch is great of course. Head diameter is slightly smaller, maybe about a Shocker size. Should be throwy, because with 6 LED's, the reflectors have a decent size. The Shocker is bout equal to 3 C8 reflectors, and I measured close to 600 kcd on one of them, in 500's on most, all with dedomed XM-L2 U2 1A's getting over 5A to each LED.
The 6-9 days for shipping usually means they don't have them. With BG, that time scares me because it can slip way longer.
I imagine the driver is press-fit/glued like the Solarstorm SP03. The R60T looks like the perfect companion for the SP03. If I win the powerball, that’s the first light I’ll get
$55 without the charger and cells…
$78 full pack
I got it, Thanks 
If you are getting close to 700Kcd with an XP-L, I'm betting an XP-G2 will be pushing 900Kcd.
Well, you wont get any bonus using XPG2 in that case even using a nice scope , just less lumens, its like TK61 - when modded with V6 1D it gave arround 600k mcds, using XPG2 it gave 820 but it was a downgrade from my point of veiw:i could see jackal eyes at 2.5 kilometers with both setups yet the XPL hotspot covered a larger area
Mitko - I tried two more XP-G2 S2 2B's from FastTech on copper MCPCB's last night, and again, can only get about 4.2A max on a direct wired, no driver, soldered up bench setup using a LG HE2 @4.22v. Did not even dedome them yet. Now I looked up when I ordered these, and it was back in Aug and Sep 2014 - 1 1/2 years ago. Wonder if the newer batch's performed better? I got slightly lower amps on a Samsung 30Q @4.22v, so figure the HE2 cells do good. My old SONY VTC5's always do worse than the HE2's and 30Q's, think I spot checked one and performed lower.
I ordered qty 3 more of the FT XP-G2 S2 2B's over the weekend, just to see if latest batch FT has is any better. How are you reflowing yours? I've been using a butane torch as of late - quick method. I used to use a frying pan and bring up the heat slowly, similar to what CREE recommends. No idea if one method is really any better than the other...
I hear you bout the small XP-G2 hot spot. I recall guys complaining about the tight hot spot of the early OSTS version of the TN31 using a XP-G2. I kind of like the results I got with the XP-L, and now that's it's solid over a mile, I'm pretty happy with the results.
could someone post a photo comparing hotspots of both xp-g2 and xm-l2 in the same reflector?
Tom, based on Mitko’s results I went ahead and ordered 8 S2-B2’s from FT. Also ordered 4 from Mtn. After I received them I hot de-domed 1 from each supplier. I, like you, was only able to achieve around 4.2-4.3a. Not sure what to make of all of this, but would like to figure it out.
Oh boy, think you mentioned this before - totally forgot. I trust Mitko but I would certainly like to understand what's goin in.
Fenix TK 61, with XP-G2 de-domed vs. XP-L de-domed
XP-G2
XP-L
I worked hard on this particular light, had issues with current spikes frying emitters, tossed 8 XM-L2’s in the trash. Traded it off to Richard with a 32mm Noctigon sporting the de-domed XP-L emitter doing up close to 600Kcd. Hate plastic reflectors.
Yeah I never had any crazy results from those S2-2B’s either. I’ve never had any XP-G2 go over 5amps. Recently I started ordering their S2-1D’s because I like the tint better.
is there a driver that will drive them ( the xp-g2s) over 5 amps AND is small enough to be used in the boss1?
Well, think I posted earlier - there is some vertical room, so it's not all that bad. Problem is you need a high amp boost, or high amp buck driver and somehow manage cells in series, like a big battery mod done by CWK above, or using 4-5 pair of 18350's (might fit 5 pair, but 4 definite).
I think if we used a zener mod FET driver with a 2S setup, there would be too much voltage to burn off - not sure, others may know better.
Yeah you can’t use a zener FET 2S on a 3v emitter, it would fry instantly. The emitter would get the full 8.4v.