At 07:05 PM 17/12/97 -0600, you wrote:
>David Bayer wrote:
>
>> Does anyone know if there are supposed to be any real advantages to using
>> amber colored foglights ---
>
>YES, there is a significant difference in using amber versus white light in
fog.
>The effect you will notice, is being able to see further, with less glare from
>the fog lighting things up in front of you.  The reason for this is that the
>longer wave length of the amber (tending toward the red end of the visible
>spectrum) is refracted (bent)less by the fog droplets, and the light is
>scattered, not sent back to you by internal reflection within the fog
>droplets.    I'm sure you all remember your physics teacher droning on about
>this, trying to make it all relevant.  Yahh.
>
>Chuck Hill, former physics teacher
>
>
In a test many years ago the German Automobil Club concluded that white fog
lights were superior to amber ones because the amber glas reduces light
output by 10-15%. The discussion goes on ...

Bj�rn