degarb
Flashlight Enthusiast
Cost $ 1185.
Double that, I bet, if you want a battery to run it.
To me, I am more interested in brightness at hour 3, hour 6 and hour 9. So, I bet it aint the brightest after, say, 5 hours of use.
I suppose a backpack with a good car battery inside might be somewhat feasible-costwise and runtimewise.