Daniel Stern Lighting Consultancy and Supply

What Good are Fog Lamps, Really?

(This article is about front fog lamps. For information on red rear fog lamps, see here.)

Many of today's vehicles have front fog lamps. What good are they? The quick and correct 2-word answer: Not much! Even good fog lamps, which are relatively rare, are of very limited use to most drivers. Fog lamps should be turned OFF almost all the time—to the extent that you forget the car has them, and the original bulbs last years and years because they're almost never used. Here are tabulations of 39 of the world's top expert vehicle lighting scientists, researchers, and engineers' assessments and measurements of three different kinds of visibility on the road at night. The assessments were made all on one night, all on the same roadways, and all with the same cars. The test conditions were as follows: