In the land of "bigger, faster, more" there is no such thing as too bright when it comes to your bicycle lights. If you've got the $$, you can throw dual B&M Big Bangs or Lupine Betty 1500s on there so you look like you stole your lighting off the tower posts at the local baseball stadium. There's no laws in the US (that I'm aware of) like the German StVZO standards for min/max intensity and cutoff focus for lighting design.

I run all cutoff focused lights on my bikes, with the exception of my L&M Solo 13W halogen which is a "see me" light by todays standards and my Supernova E3 which I installed a glare shield on to cut down on scatter.

I routinely see people using dual 600 or brighter lamps on their handlebars, plus another on their helmet.
Just to clarify: I don't endorse stupid bright blinding lamps. It's just that I don't know of any laws against them, and there are those people who will tell you that blinding bright is the only way to go to get people to see you. (which I think is bollocks.)