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Old 06-23-2005, 11:17 PM   #1
03 Black R3x
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Default Benefit w/ yellow fogs?

Just curious, cuz I notice ppl like seem to like puttin the yellow fog tint on their foglights. Is there any benfit to this? or is this purely cosmetic? It seems weird to me

Enlighten me
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Old 06-23-2005, 11:21 PM   #2
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Yellow light provides better visibility in poor weather conditions, which is what fogs are for although some people leave them on all the time for bling.
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Old 06-23-2005, 11:24 PM   #3
03 Black R3x
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is there a reason why yellow light is better than other colors? Why do some people put HIDs, seems overkill?
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Old 06-23-2005, 11:31 PM   #4
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Search around, there are plenty of threads that discuss and explain why yellow light is best for fogs. HIDs in fogs are the worst thing you can do for bad-weather visibility.
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Old 06-23-2005, 11:33 PM   #5
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Short answer: Yellow light scatters less than white/blue light, meaning less glare from fog/mist/snow.
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Old 06-23-2005, 11:56 PM   #6
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Quote:
Originally Posted by 03 Black R3x
is there a reason why yellow light is better than other colors?
It is not absolutely better.

For clear weather, any color tint means reduced total light energy being aimed to the road ahead.

For inclement weather such as rain & fog, the presence of small particles in air scatters light. The shortest wavelength, such as blue, gets scattered the most. More scatter = more useless glow & less visibility. Within the visible spectrum, red is most superior in this sense. However, red is reserved for stop lights and brake/tail lights, and orange, afaik, is not legal for forward facing lights (other than marker & turn signal lights). That leaves yellow as the best choice.

Here's a nice reference on wavelength & scatter:
http://www.newton.dep.anl.gov/askasc...9/gen99420.htm
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Old 06-24-2005, 12:55 AM   #7
03 Black R3x
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interesting info... learn somethin new everyday

thanks guys
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Old 06-24-2005, 09:40 AM   #8
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Scattering depends on wavelength, with shorter wavelengths being scattered more. So that part's true. Sorta...

But the difference between white light vs. yellow light is very small, and for those wavelengths the difference shows up in scattering by air molecules over large distances. Like many miles. Fog doesn't have the right particle-size to provide much difference between white & yellow. So yellow or red light would work better if you're worried about scattering by 100 miles of air.

Scattering by 200 feet of fog, you're better off with white, just because ANY color at all would simply make it less bright.

If there's any advantage with yellow, it's probably from your eye's ability to see contrast easier with that color. That's not the same as actual scattering.
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Old 06-24-2005, 10:08 AM   #9
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There has beena fair ammount of research into it, and there may be a little bit of trhuth to the scarreting effect, but not that much. As silly as it sounds, half the reason may be contrast. It looks different to the person driving the car, and to oncomoing traffic, all they usually see is while and red, headlights and tail-lights, if they see yellow, it cathces their eye, I know all those yellow lit lexus's catch my eye when they drive by, and that in and of itself is a decent reason to use them. Make yourself more visible to other drivers. Yes, a white lite would have more light outpuet per watt, but not by that much, and you don't want a super-bright fog light which would cause mroe glare, you just want something low to the ground so the angle doesn't glare as much and so you can see the road better.
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Old 06-28-2005, 02:53 PM   #10
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There is also the reason why fog lights placed as low as possible to a ground; because there is almost always fog free area just above the ground (of course it has nothing has to do with a lenses color
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Old 06-28-2005, 11:09 PM   #11
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Check out this site for more than you ever wanted to know about lights:

http://www.danielsternlighting.com/home.html
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