I have the same observation on my Florida 525i...seeing H20 condensation "in" my headlights & driving lights. I thought it was just a one time quirk but I noticed it seemed to get worse until I acted on it. What I did was basically put a blow dryer on warm and heat the outside glass lenses. The condensation went away quick and does not seem to be coming back. In a couple of weeks it will be mega-muggy in Florida so the condition might return for me. If you live in a climate like ours, the humidity might be the culprit. I did notice the bulbs do have what looks like a water vapor release tube for what thats worth.
Originally Posted by Loke