emitter amperage readings, tail cap amperage readings, Vf of each emitter, actual OTF lumens readings, Lux numbers, winning lottery numbers…
And specifics on the cell you’re using. The XP-G2 can have a higher Vf and the cell might have issue giving it equal power. Or, with some of the recent findings on the XM-L2 U3 it could be that one with the higher Vf and it’s producing much more output, which it should be.
So there are variables in the numbers that will show you a lot of what you’re looking to find out.
Look at the charts here that our dear friend Match assembled for us, these should show you a lot … Emitter Test Results