Condensation on inside of front fog lights...

[Eaglen00b]

So last weekend in Perth we had our first significant rain event after many many months. Came home from dinner on Sat night and drove through moderate to heavy rain on the freeway.

Once I got home I happen to notice condensation on the INSIDE of both fog lamps. A bit stumped as to why this would be the case.

Any one have any idea on possible causes and whether this is a warranty issue, or is it just simply poor design??

Photos attached.....