I was the first to bake Supra headlights way back in '98 so I could get the lens off to polish it up inside and out. Baking them seems to be pretty common now.
Z is dead on about the breathers. The air inside the plastic housing has to be able to expand somewhere when the bulbs are on. It gets pretty warm in there. Then when the lights are shut off, the air cools and sucks cold air (and humidity) back into the housing. That's where your fogging is coming from.
I never have condensation problems with my Supra (or tC) because they are garaged. When I had a carport, I had LOTS of problems with my Supra headlights from condensation. Sacramento is VERY humid in the winter months.
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