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Old 08-20-2001, 11:35 AM
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JCE JCE is offline
Down to the Wear Bars
Join Date: May 1999
Location: So Kalifornia
Posts: 2,189


If you are looking for the cool HID look, the aftermarket blue bulbs are what you want. If you want a bulb that "does the job of the fog light, only better", you need to stick with yellow dichroic, or white through a yellow reflector.

The fog light bulbs are yellow because this wavelength is scattered and relected back less than other wavelengths, and penetrates deeper into the fog and rain. (yellow fog and headlight bulbs are called 'all weather' in Europe.) The blue bulbs cut out the yellow wavelengths, and DECREASE the amount of light on the road. They don't penetrate as far, and they scatter more easily. ( ). That is why we have a blue sky - the incoming light penetrates, but the blue wavelengths scatter more than the other wavelengths. You can have the cool blue looks, or the yellow functionality, but not both.

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