Hilldweller
SE Expedition Society
A good foglight is only useful for very slow speeds; it just provides foreground illumination. The color (temp) should be white or selective yellow.How come it would not be a True fog light. Is'nt it about the beam shape?
PIAA uses tinted/coated bulb and other optical gimmicks that filters out the yellows and reds to make them appear whiter. Then they use an over-amped filament to compensate for the filter.
They might be good trail-use lights in decent weather but probably are glare producers as foglights.
You really really don't want a cheap HID conversion in foglights (or any light...) unless you ONLY plan to use them offroad.