@CathyApgar, don’t forget that he is using ill-rated COB LEDs. They don’t output 10000 lumens at 100W, but rather 6000 lumens.
So you would need even more power to actually get some good luminosity out of it, and color rendition would still be disgusting.
Still, it would be doable if you can find an optic that fits this beast:
https://www.aliexpress.com/store/product/MAXTOCH-Copper-MCPCB-4pcs-XPH70-32mm-x-1-6mm-Direct-Thermal-Path-Copper-Board/314381_32670892276.html
Then build the light around it.
However, I actually have a different recommendation for you.
Do you know about the BLF Q8?
Well, what you can do is actually replace the LEDs with very high CRI dynamic range 4000k SST-20s. It might not get 5000+lumens.
And with this light, it can actually sustain the brightness without too much difficulty with some cooling due to its excellent design.
And for battery life, you can sign up for this extension set for the Q8:
And get this monstrosity running :):
You would actually need 16 3500mAh 18650s to get the required 3 hours of brightness though 