As yellow said...it's not the bulb/led color or overall output that is the issue. Rather it is the elimination of as much spill as possible. You are going to illuminate the fog in any case, the question is what gives the best penetrating & useful vision. Next time we have some fog, I'll give a ranking of which works best that I have, and see how a camera captures it.
Ictorana, for the record to make sure I am comparing your idea of a 1-2W sealed bulb, what is the exact model/light setup you are thinking so I can compare it specifically.
Ictorana, for the record to make sure I am comparing your idea of a 1-2W sealed bulb, what is the exact model/light setup you are thinking so I can compare it specifically.