Ridgid industries makes really really nice LED stuff. But they're still pretty expensive.
I've installed a bunch of their stuff on boats, and really like it. We took one narrow beam LED out on a drive, and it's comparable to a hella 500. About the same throw distance. Slightly dimmer, slightly narrower beam.
The fogs are really cool though. Very wide angle and throw a lot of light.
Would be perfect for backup or offroad flood lights. And they only draw something like 20 watts. So you could probably run it on the car's battery for a few hours without worrying about draining it.