smoke. Lots of it!
Join Date: Jul 2006
Location: United Kingdom
Re: Misty fogs
My experience of foglamps is that they usually have breather holes at the back of the lens/housing assembly. This allows moist air to get in and out of the lens when the air expands under the heat of the lamp but the design is usually such that it will prevent rainwater or carwash water getting in.
Supplying foglamps as part of bumper assemblies, we occasionally got complaints from the car manufacturers because cars at the end of the track water checks or at dealers had foglamps would contain water or condensation.
Generally the foglamps weren't sealed units and were designed to clear after a period of time with the lamp on. However, we got lots of warranty complaints because owners wouldn't accept the presence of any water in the lamp, even when it was cold - "it didn't look right".
However, as the specification used to require any condensation/moisture to clear after x number of mins we always argued that a degree of moisture was unavoidable and should be accepted.
It will depend on the design of the lamp, but as long as the moisture clears within 15 mins or so of the lamp being on then it might be OK. However, if the lamp is a sealed unit then this might indicate a seal problem.
60% of the time it works everytime.