Quote:
Originally Posted by tt82
I have fitted LED number plate lights and Phillips cool blue fog lights.
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Short wavelength blue light is less able to penetrate fog than long wavelength yellow light. This is because the long lazy waveform of yellow light passes between the water molecules in the foggy air while the buzzy short waveform of blue light is wider and strikes more water molecules and scatters. Original fog lights always used to have yellow tinted bulbs. If you have fitted blue light emitting bulbs, the fog lights are less likely to be as helpful in the event of fog and it is illegal to use the things at any other time, so your mod seems to be somewhat self defeating. I suppose it might be considered to look "cool" but personally I prefer systems on my car to be efficacious rather than eye candy although it totally within your right to have whatever colour fog lights you prefer.