I have a 65 chevy C10 pickup....2 single headlights,,,,Sylvania Halogen bulbs.
The truck shows no signs of ever being swamped pr
flooded.....I drove it from California, and drive it every day.
One headlight has nearly 2 inches of water in the bulb!!!!!!! It works, and has been working for 2 years. The other bulb has lots of moisture droplets inside, but not like the other one.
The water has caused the reflector coating to come off but the things still light up.
I'm changing them out finally because they are really dim now but I am very curious about why they are like this and amazed they keep working.