More often than not these lights are Daylight Running Lights...not a driving light though some people mount a driving light in the same place.
Food for thought.
1...Mounting any spot or fog or flood light down low reduces the effective horizon of the light. Good measure of a position for any vision assist light is the hight above the ground of the stock headlights.
2...Mounting an auxiliary light by its brackets oriented to the side will stress the component. ( unless its designed to be fitted up that way) Most lights either hang or sit.
3... Many lights have an orientation or top. Not all lights have a rectangular or round or square light pattern. Some are triangular so mounting this type of unit upside down is detrimental to the light pattern.
A light designed to sit on its brackets might leak water if its inverted and vise-versa. Likewise you might be able to turn the glassware over and mount that same light as a hanging unit.
4... Any light and its hardware mounted to a lower fork assembly is unsprung weight. Its only form of shock absorption is the tyre, the lamp mount or flex in the lamp itself.
Look for the lightest weight units you can with a robust mount system.
5...And remember lights down that low are more susceptible to gravel, road grime and so on.
Hope that help's
Oh one last thing. If you are intending to use these as daylight running lights then they need to be hooked to the low-beam side so they come on with the ignition and stay on with high-beam too.
