According to a study and I quote
" Good (and legal) fog lamps may produce white or Selective Yellow light?it is the beam pattern, not the light colour, that defines a fog lamp?and most of them use tungsten-halogen bulbs though there are some legitimate (and a lot of illegitimate) LED fog lamps beginning to appear. Xenon or HID bulbs are inherently unsuitable for use in fog lamps, and blue or other-colored lights are also the wrong choice.
*A good fog lamp produces a wide, bar-shaped beam of light with a sharp horizontal cutoff (dark above, bright below) at the top of the beam, and minimal upward light above the cutoff. The basic reason of fog lamp to light up the edge of the road and marking.""
White or bluish is NO as it reflects via fog while yellow cut through the fog and is used is some countries. But studies have shown regular halogen bulb works best in fog light.
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