Hey Andrew, I have never replaced them but that doesn't mean the 1st owner didn't. I intend to take the lense off and check it out. I did notice that the fog lights a separation from the actual light. The water is between a plastic wall which is separated from the actual light from what I can see; therefore, I don't see it ever hitting the actual bulb. I am sure this was a design plan for situations such as this.....not sure
I will post an update whenever I get to this