Ah, okay. I guess he needs to update his listing information then. Anyway, if enough people committed to buying them, he might be talked into sourcing some 3 volt XHP-50.2 emitters. Then, members could buy them from him already reflowed on his board and no group buy needed. He currently has no CREE emitters listed on his site.
XHP35 is the way to go on the Q8, I love mine.
If you cant do 35hi’s then 50.2 is the way to go.
I would definitely be in for one.
In for one or two if neutral CCI.
Is the even a neutral 50.2?
Yes, but only down to 5400k.
I’ve actually been meaning to do a group buy of the XHP50.2+BLF Q8 upgrade kit, but I first need to ship every order in my own GBs, and find the time. 
What maximal lumen output can be expected with the upgrade kit - 4x XHP50.2 ?
Mine at turn on with VTC5A’s 16000+lm on my calibrated T/A Maukka 4” tube. YMMV…
With 20S 17000+lm
My X6 Copper 21700 30T with lens… 4800lm
X6 with out lens…. 5000+ lm
Would like to see what 4x30T’s would do… 
I would be in. Depending on price of course.
I will take one, hopefully it will be less than Q8 itself.
Kaidomain have the bare 6000K and 6500K LEDs, free shipping to the UK but takes a little while.
Thanks for this. But I much prefer neutral/warm tints (4000k is favourite), so even at 5400k it’s pushing it a bit.
KawiBoy - Have you modified or upgraded your Q8 in any other way to get those numbers? Other than the XHP50’s and spring bypasses I presume?
No not that I can remember Tinergy 18awg bypass’s on the springs, 18awg leads…
Remember you have to open the emitter holes in the reflector a bit…
I just chamfer the emitter holes to just fit around the emitter pad to keep it centered with out bang it around or use centering rings…
Here are some of my bit(s) I use… some use tapered reamers?
I might of changed the FET to an Infineon? I do that because of the cloned/fake/copied FET and 7135’s that are out there now… I only buy the important stuff from Arrow, Digikey or Mouser… I don’t remember having to do that on the Sofirn Q8…
Thanks KawiBoy!
I’d be in for a pair for sure. Have been looking to upgrade my q8 somehow.
How much will sustainable lumens increase with 3V 50.2? If I’m not wrong the original Q8 stabilises around 1500 lm.
I also wonder about the beam profile. With stock XPL HDs the Q8 has nice balanced beam with some usable throw. Wont XHP50’s change it into all out flooder?
Also did anyone consider swapping the stock LEDs with SST40 5000k? That would be a an interesting build.
A bit more, maybe 2500, because the 50.2’s are driven in a more efficient current for this output.
I do have a Q8 with Luxeon V’s which has comparable output but a bit lower Vf, it does a bit under 8000 lumen. Maybe with SST40’s it will be close to that?
Interested.