I don't know whether this helps or not, but back in the day when I was using LF routinely, an AD200, good as it may be, wouldn't have been usable.
With 4x5", the working (shooting) aperture was normally f/45, and with 10x8" it was f/64. The max aperture may have been f/5.6 or thereabouts but this was just for focussing, not for shooting, both image quality and DOF requirements mandated the use of small apertures. The difference in power output needs between f/5.6 and f/45 is massive.
Back then, I managed with 6x2400J generator flash units, 1x6000J and 1 x 5000J, plus other, smaller ones that just weren't powerful enough for f/45 at 100 iso. On that basis, and in theory, a 480-watt LED light should be able to produce the same exposure as a 2400J flash, with an exposure time of ONE SECOND. But that assumes that the figures claimed by the manufacturer are true, and totally disregards the loss of lighting power that results from the energy that is output in the form of heat rather than light, which will make a difference, although I don't know how to quantify that difference. Back in the days of non-LED lighting the rule of thumb was that 2/3rds of the lighting energy would be output as heat, reducing the actual, usable light output to just 1/3rd, or if you prefer the 1-second exposure would become 3 seconds. LED lights are much better, but the heat loss will still matter.
I agree, but I think there's more to it than that (my bold). The flash market is now totally dominated by Godox products, other manufacturers simply can't sell their flash products so they market their LED lights (which have a much lower and cheaper entry barrier) as being perfect for still photography, and part of that marketing often includes deceptive sales videos on YouTube, which defy logic, common sense and the laws of physics. The sad thing, IMO, isn't that they make false claims, it's that a lot of people actually believe those claims.
Don't misunderstand me, I love LED lighting - for video