Originally Posted by jyossarian
You missed the Nashbar sale last month. The L&M ARC HID was $263 shipped. I have one and it's amazing how bright it is, but I wouldn't try riding 30 mph at night on an unlit or poorly lit road with it, but that's more a matter of how good your night vision is. According to slvoid's lighting chart, you should be able to travel 35-39 mph and still be safe. YMMV
Don't worry, I won't be exceeding 30mph in the pitch black. You can count on that. Those Dura Ace brakes should help. And we don't have 'lit' roads around here, poorly or otherwise. Think 'blackest depths of of the forest' and you get the general idea.
I would advise anyone to determine how fast to safely ride in the dark by their own night vision and common sense. Not something that lends itself to BF charts in my view. Besides, it's kind of tough to read the bike computer in the dark on the roads I'm referring to : ).