Where are you seeing 4292 lumens max? Does it state what amps is getting that lumens? lumens output depends on amps, so, it's common now to run LED's well over stated maximums in a spec sheet.
Here you can see the XHP70.2 is capable to exceed 8000 lumens: https://budgetlightforum.com/t/-/49020. but look at the amps and voltage.