hi all, i am thinking of changing my standard headlights on my mk4 and have been looking at angel eye headlights, but i know nothing about them. has anybody got any information on them please?

do they improve night vision?

what would be the best ones to buy as i notice there are quite a few different ones on the market?

are they just a straight swop for the old ones?

and most importantly, are they legal??

thanks