Ok, I finally managed to get my hands on an XHP70.2 thanks to Lumintop.
So I put it on the sphere and was seriously impressed.
I ran this test at 12V so that I could test it fully since my power supply is limited to 15A. I have converted the numbers to the more common 6V in the spreadsheet.
If you would like to see the performance at 12v, simply double the voltage and half the current. So 10A at 6V becomes 5A at 12V (which is what the BLF GT is capable of doing on the stock driver).
This LED is so powerful it overloaded my 95W CPU heatsink. The numbers over about ~120w would be improved with better heatsinking I am sure, although not sure how much improvement.
With better heat sinking I would expect it to preform very much like my XP-L2 test here (since it is 4x XP-L2 dies on a single LED). So the lumen output should keep rising slowly until ~20A before leveling off instead of maxing at around 18A.
The cold start numbers are after letting the heat sink cool down and taking a reading at 5s, it is a good indication of what to expect in the first few second in a light. 30s numbers will be closer to the normal hot test numbers unless you light is massive.
Even after pumping over 180W into this LED when retested at 2A it put out the same lumens as it did when I started, very impressive!
Far as the beam goes, I have only tried it in the GT reflector so far and it is much better then the xhp70 but still does have a darker spot in the middle but it is much improved.
Now for the numbers, It peaked at just under 9k lumens, with a larger heat sink I am guessing it would have made it a bit over 9k before leveling off.
on a cold start at ~24A it did over 10,000 lumens at 5s!
I did a test of a xhp70.2 M4 80CRI for the GT, I am quoting that below.