It was a one-led test but the XP-L Hi that I tested 4 months ago (a 5000K U6 bin from Mouser) died at a bit over 8A (apparently I tested a tough one, see RMM’s comment above). The maximum output I got at 7.5A. But mind that the heatsinking in a flashlight will never be as good as in my test set-up, so aim lower than that.