I saw a little condensation in a headlight after being in a cool garage and then car sat in hot sun and then back in a cool garage. That s when I noticed. Is that OK? Here what I found on this site doing a search.

Explanation of condensation in lights:

A frequently disputed issue is fogged glasses inside the lights. This
effect occurs after driving in rain or cold nights, and is a normal physical process. Through the light vents the expanding heated air gets discharged from the lamp housing. After the light is switched of, the light slowly cools down and moist air penetrates from the outside in through the vents. This moisture evaporates in the hot light housing and reflected upon cooling down as the condensation in the headlights. This process is called condensation. After a short ride in dry weather or after the light is switched on the evaporation process begins and the condensation dry of. Technically this process is safe because the reflector is protected against the effects of condensation.

A 100% sealing those lights would cause the following problem:

With just a little penetration of air (air has natural water content) and decreasing temperature water vapor would stick down at the coolest spot in the light housing. This moisture would go out very slowly or not at all.

Therefore, most systems are designed to be open so the moisture evaporates quickly.

 

I'd worry about the potential for rust, corrosion, etc. I've had 4 - 997's in the last 10 years and never saw any condensation in my lamps...and I'm in a hot and humid climate too.

 

I am still learning my new-to-me C4S. However, I am pretty sure I read in the owner's manual that some/little condensation was normal, venting was necessary, and should be no concern.

 

Thanks, what an idea , check the manual.
Only seen it once.

 

Its a known issue where I am. I've had the problem ever since the car was new. Porsche even replaced a set of headlights for me because the issue of condensation created maps of dust to accumulate under the plastic lens. Since the headlights could not be disassembled and could not be cleaned , it was replace under warranty. The problem however returned and it just learned to live with it. They should have just made the headlight in a way you could dismantle to clean like those mb lenses before held on by clips.