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Have you ever driven in heavy fog? Standard headlights decrease your visibility in heavy fog- the suspended water droplets diffuse the light and just reflect a lot of the light back at you. You end up just illuminating the the fog instead of the road. Fog lights are low to illuminate the road surface so you can see where you are going. They are more focused and lower output to increase your visibility. It's counter-intuitive but drive in heavy fog just once and it will all make sense.
Aroogah-
Yeah and I'd always assumed there was something special about the beam or light itself.
Then when I was trying to find an answer online something suggested it was their position and the fact that they lit up the road. So it got me wondering.
#CSB the last time I went to France we swung by a supermarket before getting on the road. My after a long debacle with picking the car up me OH got annoyed at me trying to use the rental cars sat nav. But unfortunately my gmaps had the toll road setting off as we'd recently been to to Manchester.
Shortly after being taken off the main route an epic fog descended rolling off the fields. It was scary af not knowing where the lights were in the rental car, not being able to stop, not being able to see, or know where we were going, doing 20km at some points.
What should have been an hour and a half to two hours to get to the house took four.
hugo7
is there anything special about fog lights or are they just bright lights mounted low?