Do bare in mind some of the details of “best” cells discussed on this forum are really minute gains and not really noticeable in real use.
For cell testing, I don’t know anyone who’s contributed more to this community (and vapes, ebikes, etc) than Mooch, see the reccomended cell lists here:
https://www.patreon.com/posts/18650-21700-137974745
I saw a review which says the Sofirn C8F does 3500 lumens, that’s c.1170 each.
Texas_Ace tested an XP-L Hi at 3.65v 3.75A (13.7W)
So to achieve max output, the LEDs will be wanting 11.25A (41.1W), maybe add 10% for driver inefficiency, and you’re up to c.45W.
This will only be during max output, so with thermal throttling, the brightness will ramp down.