Dan knows a ton about LED's but he has written articles for safety boards that deal with automotive lighting. He knows which lights are good and why as well as which ones are bad.
I drove a Toyoyta rental car last September in Norway. I have no idea what lights it had. The car was brand new more or less, couple of thousand miles on the meter. The light were horrible. It had spots here and there that was totally dark, so when turning in a curve, if the road went a little up or down, you saw nothing. I had to hit the brakes quite often because of that. I doubt it was LED, but maybe. It is the worst lights I have seen on any car in my life.