With fog lights you want a sharp cut off on the top of the light beam and it needs to point down so it doesn't illuminate the fog above a horizon line that is lower than your eyeball. So a light that came with a blue bulb may be a pencil beam and need more than a color change.
It's kind of like the difference between the high beams and low beams. You want a low beam for fog, the blue lights may be a high beam.
And mounted that low, if they angle down the view will be blocked by the hood. If they were moved up into the upper, or at least the lower grille, I think you would get a better result. You were going to block the grille anyway, right?
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