I did not mean running stock.
It’s just that both XP-G2 and XP-L HI have Vf at their peaks exceeding 4.2 V and therefore for best performance need 2s input and a buck driver. Which happens sometimes, but nevertheless is a rare option.
XHP35 HI needs boost driver regardless of how hard it’s driven (or rare 4+s), but few drivers are capable of running it at the peak.

Thanks. That means I can run it off a direct driver FET driver?
See XP-L HI 1A V2 LED Output test by Texas_Ace, Well, you have seen the HD, this is the HI. It is exactly what you expect. and XHP35 output and death test + PWM efficiency test by Texas_Ace
You can run it with FET to get about 90% peak performance. With a fully charged battery. At this point it will offer about the same cd as XHP35 HI driven to the max, but with less heat. And far less lumens.