When I follow the link to youtube I see an 240000 lm output for 8000W lamp. That is only 30lm/Watt.
White LED lighting can get 200lm per Watt. Green led's can have a higher light output per Watt.
Ok, how many expensive 5w green led can you cram into a single point to attain a 240,000 lm pulse?
120 5watt leds? We aren't talking about the 1watt leds.
Concentrated into a tiny package.
Luckily with such a low duty cycle, you might not need any heat sink.
Optics and packages for a huge 100watt spot led (usually made with smaller segments) can be purchased, circuit designed and manufactured. It will take a lot of work as you want a 100watt current regulated pulse, but don't need the continuous constant power output if you want this device to run off of 2-4 batteries.
If you want continuous output, think along the lines of those DIY insane bright LED flashlights. Your looking for a pulsed version of those where the pulse length will be around 0.1 or 0.05 seconds for human eye visual brightness instead of the less than 0.0001 second pulse of a xenon camera pulse.