Fog Lights

[Marcelino]

What does everyone think of the Mazda 3 Fog Lights??

Whats there stock color??

What are the best colors for Fog Lights???

(SEND PICS)

CANT WAIT TO GET MY 06 Mazda 3 GS Fully Loaded!!:D

[DrunknFoo]

Originally posted by Marcelino


What does everyone think of the Mazda 3 Fog Lights??

Whats there stock color??

What are the best colors for Fog Lights???

(SEND PICS)

CANT WAIT TO GET MY 06 Mazda 3 GS Fully Loaded!!:D

Fog lights are fog lights, be it used for visibility or cosmetic...
Stock Color? Many pics throughout the board. Best color? personal preference no?

[ds2chan]

the fog lights are white.. most ppl want a yellow color.. so they buy yellow bulbs and switch them up..

I personally don\'t mind the white so I never swapped them out..

sorry, no pictures of other ppl\'s cars.. but come to the meets and I\'m sure u\'ll find tons of ppl with yellow fog lights..

and congrats on ur car.. I\'m sure u\'ll waste $20 in gas in the first couple of days.. :p

[kenk]

I believe yellow has historically been used for fog lights as it penetrates fog, rain and snow better than \'white\' light. Blue penetrates even better but, I believe, it is only allowed on emergency and road maintenance vehicles. White light tends to reflect back from fog, rain and snow creating a white wall in front of you so calling them \'fog lights\' as original on the M3 is a sales gimmick. In reality they should be called \'driving lights\'.

Having fun with our M3
(when my wife lets me \'borrow\' it)javascript:smilie(\':D\');
javascript:smilie(\':D\');
Ken

[MAZDA Kitten]

Originally posted by Marcelino


What does everyone think of the Mazda 3 Fog Lights??


Useless


Originally posted by Marcelino

Whats there stock color??


White like your headlights but like someone said a lot of people have switched to yellow myself included


Originally posted by Marcelino
What are the best colors for Fog Lights???


Here is a scientific explanation:



Question: Why are fog lights yellow? Does it help that they are? Does it matter
if
you are driving in city or countryside?
jessica v.

Answer: My understanding is that it is important for fog lights to be one color
(rather than white, which is all colors) because the different
wavelengths(colors) of visible light scatter off the fog droplets
differently. This phenomenon is known as \"dispersion,\" because the
different colors of light in an image will separate from each other,
causing the image to \"disperse.\" If you illuminate the road with only one
wavelength (color) of light, the images of the objects you see will still
become somewhat blurry because of the scattering of light by the fog, but
at least you won\'t have extra problems from dispersion. So, if we want to
use just one wavelength of light, which wavelength should we use? It turns
out that light with short wavelengths scatters more than light with long
wavelengths (short to long: violet, indigo, blue, green, yellow, orange,
red). So, a long wavelength light will be best. There\'s another thing to
consider, too: our eyes are not equally sensitive to all colors. It turns
out that we are most sensitive to yellow and green light. So, our best
compromise between sensitivity for our eyes and a long wavelength for least
scattering is yellow light.
Now, I don\'t know what kind of light bulbs are used in fog lights, but
another consideration used in street lighting is cost and efficiency. You
may have seen some yellow street lighting in some places; this is
\"low-pressure sodium vapor\" lighting. The special thing about this light
is that it is almost entirely one (actually two very close together)
wavelength of yellow light, and that it gives the most illumination for the
amount of electricity. A big problem with this light, though, is that it
throws off color perception. Under sodium vapor light, something blue
looks gray. This makes it hard to, say, recognize your car in a parking
lot.
Richard Barrans Jr., Ph.D.
================================================== =======
There is no good reason why fog lights are yellow. Here is an
excellent explanation provided by Professor Craig Bohren of Penn State
University:


\"First I\'ll give you the wrong explanation, which you can find here and
there. It goes something like this. As everyone knows, scattering (by
anything!) is always greater at the shortwavelength end of the visible
spectrum than at the longwavelength end. Lord Rayleigh showed this, didn\'t
he? Thus to obtain the greatest penentration of light through fog, you
should use the longest wavelength possible. Red is obviously unsuitable
because it is used for stop lights. So you compromise and use yellow
instead.


This explanation is flawed for more than one reason. Fog droplets are, on
average, smaller than cloud droplets, but they still are huge compared with
the wavelengths of visible light. Thus scattering of such light by fog is
essentially wavelength independent. Unfortunately, many people learn
(without caveats) Rayleigh\'s scattering law and then assume that it applies
to everything. They did not learn that this law is limited to scatterers
small compared with the wavelength and at wavelengths far from strong
absorption.


The second flaw is that in order to get yellow light in the first place you
need a filter. Note that yellow fog lights were in use when the only
available headlights were incandescent lamps. If you place a filter over a
white headlight, you get less transmitted light, and there goes your
increased penetration down the drain.


There are two possible explanations for yellow fog lights. One is that the
first designers of such lights were mislead because they did not understand
the limitations of Rayleigh\'s scattering law and did not know the size
distribution of fog droplets. The other explanation is that someone deemed
it desirable to make fog lights yellow as a way of signalling to other
drivers that visibility is poor and thus caution is in order.


Designers of headlights have known for a long time that there is no magic
color that gives great penetration. I have an article from the Journal of
Scientific Instruments published in October 1938 (Vol. XV, pp. 317-322).
The article is by J. H. Nelson and is entitled \"Optics of headlights\". The
penultimate section in this paper is on \"fog lamps\". Nelson notes that
\"there is almost complete agreement among designers of fog lamps, and this
agreement is in most cases extended to the colour of the light to be used.
Although there are still many lamps on the road using yellow light, it
seems to be becoming recognized that there is no filter, which, when placed
in front of a lamp, will improve the penetration power of that lamp.\"


This was written 61 years ago. Its author uses a few words (\"seem\",
\"becoming recognized\") indicating that perhaps at one time lamp designers
thought that yellow lights had greater penetrating power. And it may be
that because of this the first fog lamps were yellow. Once the practice of
making such lamps yellow began it just continued because of custom.\"


Also, take a look at the following web site:
http://www.gi.alaska.edu/ScienceForum/ASF5/593.html

Dr. Lawrence D. Woolf
General Atomics

[MAZDA Kitten]

Originally posted by MAZDA Kitten



Originally posted by Marcelino


What does everyone think of the Mazda 3 Fog Lights??


Useless


Originally posted by Marcelino

Whats there stock color??


White like your headlights but like someone said a lot of people have switched to yellow myself included (for purely cosmetic reasons only... read below)


Originally posted by Marcelino
What are the best colors for Fog Lights???


Here is a scientific explanation:



Question: Why are fog lights yellow? Does it help that they are? Does it matter
if
you are driving in city or countryside?
jessica v.

Answer: My understanding is that it is important for fog lights to be one color
(rather than white, which is all colors) because the different
wavelengths(colors) of visible light scatter off the fog droplets
differently. This phenomenon is known as \"dispersion,\" because the
different colors of light in an image will separate from each other,
causing the image to \"disperse.\" If you illuminate the road with only one
wavelength (color) of light, the images of the objects you see will still
become somewhat blurry because of the scattering of light by the fog, but
at least you won\'t have extra problems from dispersion. So, if we want to
use just one wavelength of light, which wavelength should we use? It turns
out that light with short wavelengths scatters more than light with long
wavelengths (short to long: violet, indigo, blue, green, yellow, orange,
red). So, a long wavelength light will be best. There\'s another thing to
consider, too: our eyes are not equally sensitive to all colors. It turns
out that we are most sensitive to yellow and green light. So, our best
compromise between sensitivity for our eyes and a long wavelength for least
scattering is yellow light.
Now, I don\'t know what kind of light bulbs are used in fog lights, but
another consideration used in street lighting is cost and efficiency. You
may have seen some yellow street lighting in some places; this is
\"low-pressure sodium vapor\" lighting. The special thing about this light
is that it is almost entirely one (actually two very close together)
wavelength of yellow light, and that it gives the most illumination for the
amount of electricity. A big problem with this light, though, is that it
throws off color perception. Under sodium vapor light, something blue
looks gray. This makes it hard to, say, recognize your car in a parking
lot.
Richard Barrans Jr., Ph.D.
================================================== =======
There is no good reason why fog lights are yellow. Here is an
excellent explanation provided by Professor Craig Bohren of Penn State
University:


\"First I\'ll give you the wrong explanation, which you can find here and
there. It goes something like this. As everyone knows, scattering (by
anything!) is always greater at the shortwavelength end of the visible
spectrum than at the longwavelength end. Lord Rayleigh showed this, didn\'t
he? Thus to obtain the greatest penentration of light through fog, you
should use the longest wavelength possible. Red is obviously unsuitable
because it is used for stop lights. So you compromise and use yellow
instead.


This explanation is flawed for more than one reason. Fog droplets are, on
average, smaller than cloud droplets, but they still are huge compared with
the wavelengths of visible light. Thus scattering of such light by fog is
essentially wavelength independent. Unfortunately, many people learn
(without caveats) Rayleigh\'s scattering law and then assume that it applies
to everything. They did not learn that this law is limited to scatterers
small compared with the wavelength and at wavelengths far from strong
absorption.


The second flaw is that in order to get yellow light in the first place you
need a filter. Note that yellow fog lights were in use when the only
available headlights were incandescent lamps. If you place a filter over a
white headlight, you get less transmitted light, and there goes your
increased penetration down the drain.


There are two possible explanations for yellow fog lights. One is that the
first designers of such lights were mislead because they did not understand
the limitations of Rayleigh\'s scattering law and did not know the size
distribution of fog droplets. The other explanation is that someone deemed
it desirable to make fog lights yellow as a way of signalling to other
drivers that visibility is poor and thus caution is in order.


Designers of headlights have known for a long time that there is no magic
color that gives great penetration. I have an article from the Journal of
Scientific Instruments published in October 1938 (Vol. XV, pp. 317-322).
The article is by J. H. Nelson and is entitled \"Optics of headlights\". The
penultimate section in this paper is on \"fog lamps\". Nelson notes that
\"there is almost complete agreement among designers of fog lamps, and this
agreement is in most cases extended to the colour of the light to be used.
Although there are still many lamps on the road using yellow light, it
seems to be becoming recognized that there is no filter, which, when placed
in front of a lamp, will improve the penetration power of that lamp.\"


This was written 61 years ago. Its author uses a few words (\"seem\",
\"becoming recognized\") indicating that perhaps at one time lamp designers
thought that yellow lights had greater penetrating power. And it may be
that because of this the first fog lamps were yellow. Once the practice of
making such lamps yellow began it just continued because of custom.\"


Also, take a look at the following web site:
http://www.gi.alaska.edu/ScienceForum/ASF5/593.html

Dr. Lawrence D. Woolf
General Atomics


To summarize: Yellow doesnt improve visbility

[Junior]

Originally posted by kenk


I believe yellow has historically been used for fog lights as it penetrates fog, rain and snow better than \'white\' light. Blue penetrates even better but, I believe, it is only allowed on emergency and road maintenance vehicles. White light tends to reflect back from fog, rain and snow creating a white wall in front of you so calling them \'fog lights\' as original on the M3 is a sales gimmick. In reality they should be called \'driving lights\'.
Ken

ROFLMAO