Problem with modifications like these is there are no strict legal/illegal guidlines. Fact is if a police officer thinks they are not legal, he will follow it through. I had dark lights on one of my old cars and got pulled over. Luckily i had the originals in the boot and said i would change them as i had just been at a show. They were cool and said they didnt want to see me with the lights on again, on ebay they went.
Same as HIDs, you might not get pulled for them or you might.