Thanks for the nice teardown Linus! This light will still be on my watchlist of lights very interested in.. (Im not pulling the trigger yet though)
Hopefully all info below will clarify some for those who have missed some of the info around XM-L vs XM-L2.
Having 3 cells to divide the current on, I would easily go with XM-L2. Which I even do in the majority of my single cell lights. It would be fairly easy to get 6A peak, or higher depending on cell. And you would also see 5A+ for a good/long amount of time depending on the cells... Having 2 or 3 cells in parallel helps limit sag a lot!
In general you either get higher output with XM-L2, or about similar output at lower current. But I had an example that was even worse (which I mentioned to Ouchy in another thread). So if you get an XM-L with lower than average Vf, and an XM-L2 with higher than average Vf, the XM-L could be brighter, in my extreme example with a partially drained battery it was 3,5A for the XM-L vs 2,2A to the XM-L2 with a drained battery. Its not common with such a large difference though..
As for lumen vs current:
(Direct copper mount, not copper MCPCB, but its probably quite similar)
6A to XM-L gives you around 1480 lumen.
In order to get similar output on XM-L2 you only need. 4,4A. Im not 100% sure what bins was used.
2,6A to XM-L2 gives you 1000lumen. 3A To XM-L gives you 1000 lumen..