A real easy way to tell if they are "driving" lights or "fog" lights, is the appearance of the lense. Fog light lenses have all "grooves" cut on the inside of the lens. Sort of like vertical blinds. You can barely see the bulb it's self. Driving lights have very little "cuts" in the lens. They are usually 85-90% clear glass. Some people think driving lights are clear and fog lights are yellow. Actually you can both types of lights in either color. The difference is the cut of the lens.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section