In reply to mullermn:
> Modern bixenons should only really be a problem if they're after market fitted units. Factory fitted lights should be auto levelling - if you've seen cars where the headlights do a 'dance' when the ignition comes on, that's what is happening.
I do wish people wouldn't ascribe magical properties to auto levelling systems. They do the same thing as the little wheel under the dash board. Fat blokes sit in the back, twiddle the wheel to point the headlights down to the normal setting. They don't work if cresting hills or on undulating roads. It's worse with 4x4s, as the lights are mounted high in relation to other vehicles, so no matter how they're adjusted there's always an element of glare for oncoming traffic.
> Ofcourse it helps if you're also driving a car with modern lights.. If your eyes have been adapted to the 2 or 3 lonely lumens that manage to escape from old style headlights then anyone else on the road with modern lights is going to seem dazzling.
You do realise the back scatter you as a driver see from your headlights is about 1% of the intensity any unfortunate looking directly at the headlight receives? If we both put on 200 lumen headtorches and point them in each other's faces we'll still be dazzled, the opposing beams of light don't cancel each other out.
Drivers who really feel a need for more than the terribly old fashioned headlights at night might be better off visiting a good optician than a car dealership or Halfords.