This guy in Australia probably has the brightest vehicle in the world.

2x 70W bi-xenon headlights
3x 100W HIDs on a bullbar
4x 100W HIDs on a roof rack
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82,000 lumens, thats about 8.5 times more powerful than my setup

I'm going to post a link to his YouTube profile, some of his videos have some R-rated words coming from his passengers when he flips the switch.

http://www.youtube.com/user/Lumenmunster

I can only imagine the size of the batteries/alternators he has on that thing.

 

you dont need alot of batteries or alternators for that set up, hids do not draw much power at all, he could probably get by witht he big 3 upgrade on stock alternator and a good deep cycle under the hood, and if i were driving head on into that thing, you better believe when i got my vision back i would turn around and follow him