Try strobe mode
What Lumen rate is that BTW ?
I got a 45000Lm 14x LED Cree XML T6
A bit of a fib on the lumen claims methinks
If I take one of those zeros off the end it would be closer to the truth
XML-T6 is rated to 700lm at it's maximum current, so yeah. You'd also need to be drawing 28A current to get that from your batteries, so yeah.