I have a 460 LS - purchased in California in July 08. The service manager at dealer in Calgary seems surprised that I don't like the headlights, but he hasn't had time to clearly see the lights (!) my problem sounds like yours, that is; a dark band between low and high beam and the high beams are aimed so high they are useless. I will have another discussion with dealer next week and hopefully he will treat me with respect and actually see the headlight pattern rather than dismissing it or claiming that if there is a problem, it is due to poor dealer preparation and therefore not a warranty item.
I'll take some photos tonite and post them.
I don't know what happened to my other posts on this forum.... so Lexus Canada say (by email) they agree with my assessment and the dealer's assessment that there is a gap in light between the low and the high. I asked if they had a fix for this problem and they have not replied. (3 months). I guess I'll drive a different car at night in the country.