Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 29th June 2006, 11:41   #1
BHPian
 
willy's Avatar
 
Join Date: Apr 2006
Location: Bangalore
Posts: 146
Thanked: 0 Times
Default Use of Fog lights in cars?

Can anyone tell me the actual use of a Fog Lights in the cars? And why the fog lights are always in the bottom of the cars?
What should be the color of the light? Some cars it is Yellow and some in Blue and so on...

I feel, the fog lights are placed so low because it is better visible in the fogs.
willy is offline   Reply With Quote
Old 29th June 2006, 11:46   #2
BHPian
 
Join Date: Jun 2006
Location: new delhi
Posts: 167
Thanked: 0 Times
Default

i like the fog light coz they look good on the car, and the increase the vision during winter time out here in delhi thats what i have noticed
200mph is offline   Reply With Quote
Old 29th June 2006, 11:47   #3
Team-BHP Support
 
Rtech's Avatar
 
Join Date: Apr 2004
Location: Bombay
Posts: 5,769
Thanked: 213 Times
Default

Fog lights produce a short but wide beam spread which falls close to the car. This allows the driver to see the edges of the road and a bit ahead without the glare of the main headlights reflecting off the fog and in essence, blinding the driver itself.

Yellow light is more effective in bad weather. Some else here may go into the details of wave lenghts etc. Blue is NOT a colour used for any sort of fog lamp.

The common mistake most users make when driving through fog is to turn on their high beams. This is infact the worst thing to do.

Last edited by Rtech : 29th June 2006 at 11:48.
Rtech is offline   (5) Thanks Reply With Quote
Old 29th June 2006, 11:59   #4
BHPian
 
willy's Avatar
 
Join Date: Apr 2006
Location: Bangalore
Posts: 146
Thanked: 0 Times
Default

Ok Rtech, What i understand from your text is that. One should always try to use the Fog lamps in places where there is more fog instead of head lights.

But the reason it is placed so low in all the cars? What do you have to say about that?

Thank you moderator to moving the post to the right thread I always make this mistake
willy is offline   Reply With Quote
Old 29th June 2006, 12:11   #5
BANNED
 
viper's Avatar
 
Join Date: Mar 2005
Location: Mumbai
Posts: 1,769
Thanked: 8 Times
Default

Hi,

You need to use your main lights as well but in low beam & not high beam. Well it is mainly placed so low for 2 reasons:

1> Not to blind oncoming drivers
2> So that the beam is focussed closer to the road that you need to see during foggy conditions.

Viper
viper is offline   Reply With Quote
Old 29th June 2006, 12:19   #6
BHPian
 
willy's Avatar
 
Join Date: Apr 2006
Location: Bangalore
Posts: 146
Thanked: 0 Times
Default

It really makes sence to me.

I nowadays see guys keep the foglight on even on normal days(Where there is no fog).
willy is offline   Reply With Quote
Old 29th June 2006, 12:19   #7
Senior - BHPian
 
speedsatya's Avatar
 
Join Date: May 2004
Location: bangalore/manga
Posts: 3,161
Thanked: 706 Times
Default

read this for more info on adjusting the lights
http://www.danielsternlighting.com/tech/aim/aim.html



abt blue fog lamps ...Hella makes blue fog lamps in its FF series
http://www.hella.com/produktion/Hell...Jumbo_Blue.jsp
speedsatya is offline   Reply With Quote
Old 29th June 2006, 12:32   #8
Team-BHP Support
 
Rtech's Avatar
 
Join Date: Apr 2004
Location: Bombay
Posts: 5,769
Thanked: 213 Times
Default

Quote:
Hella makes blue fog lamps in its FF series
Those seem similar to the "blue bulbs" we get for headlight (crystal/diamond vison etc). More for the 4x4 driver who never takes his truck offroad.
Rtech is offline   (1) Thanks Reply With Quote
Old 29th June 2006, 13:13   #9
BANNED
 
revharder's Avatar
 
Join Date: Jan 2006
Location: New Delhi
Posts: 460
Thanked: 47 Times
Default

Quote:
Originally Posted by willy
But the reason it is placed so low in all the cars? What do you have to say about that?
it is fixed at a lower height because proper fog lamps does not have any long throw of light. they gives a very short but quite wide light.
and hence they are placed very low in bumpers to allow drivers see the road ahead in dense fog.
it doesnot helps much in seeing the things at a distance and at height.

best fog light colour is yellow coz it penetrates the fog just ahead of car and allows one to see the road.

and the need of low beam of main headlamp is not a compulsion in cases where foglamps are already working. high beam is strictly prohibited.

some jeeps and cars have fog lamps fixed on their roofs!
and they have the poorest visibility when there is a maximum need of visibility! all they do is blinding the oncoming traffic which in turn can take them head-on!

safest bet is to use yellow spread-type fog lamps and fix them lower in bumpers and keep their focus onto ground.

one tip to share:
driving in foggy nights is much easier than in foggy daylight!

Last edited by revharder : 29th June 2006 at 13:14.
revharder is offline   Reply With Quote
Old 29th June 2006, 13:48   #10
Senior - BHPian
 
headers's Avatar
 
Join Date: May 2006
Location: Greater Chennai
Posts: 4,589
Thanked: 454 Times
Default

Revharder and Rtech have really said what i wanted to say..Also using your normal headlights in fog will not improve and infact reduce your visibility..
headers is offline   Reply With Quote
Old 29th June 2006, 14:09   #11
BANNED
 
Join Date: Feb 2005
Location: Mumbai
Posts: 1,054
Thanked: 11 Times
Default

I think it's now also illegal to have any lights (fogs or other) which are above the height of your headlights. Could someone please clarify this?
Boom Shiva is offline   Reply With Quote
Old 29th June 2006, 15:16   #12
Team-BHP Support
 
Rehaan's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 22,381
Thanked: 22,610 Times
Default

Quote:
Originally Posted by willy
But the reason it is placed so low in all the cars? What do you have to say about that?
On our TBHP drive to mahableshwar, i remember GTO mentioning that the reason fog lamps are always placed as low as possible is because the fog never settles all the way to the ground, so it is always a bit less dense at that low level.

I think there is an existing thread discussing this, will try to find it.

cya
R
Rehaan is offline   (1) Thanks Reply With Quote
Old 29th June 2006, 15:30   #13
BHPian
 
willy's Avatar
 
Join Date: Apr 2006
Location: Bangalore
Posts: 146
Thanked: 0 Times
Default

Quote:
Originally Posted by Rehaan
On our TBHP drive to mahableshwar, i remember GTO mentioning that the reason fog lamps are always placed as low as possible is because the fog never settles all the way to the ground, so it is always a bit less dense at that low level.

I think there is an existing thread discussing this, will try to find it.

cya
R
Yes , i too had the same in my mind. Thank for all your clarifications friends....
willy is offline   Reply With Quote
Old 29th June 2006, 17:37   #14
BHPian
 
Join Date: Mar 2005
Location: Singapore
Posts: 262
Thanked: Once
Default

One more reason for this:
The easiest way to drive in fog is to watch the lines painted (or reflectors) on the sides or middle of the road. Fog lamps at a lower height are best for this..

Of course, in our country, you will have to go searching for roads that have painted lines at the edges..
nitinbhag is offline   Reply With Quote
Old 29th June 2006, 23:47   #15
Team-BHP Support
 
tsk1979's Avatar
 
Join Date: Feb 2005
Location: New Delhi
Posts: 22,955
Thanked: 15,648 Times
Default

Color :
The reason is scatter. Smaller wavelengths scatter more. Thats why the Stop Signal is Red and not Blue. So in a fog there is more chance of seeing red than Blue
Rainbow is VIBGYOR in increasing wavelength. So Red is the best color for brake lights. But in Fog lamps apart from making sure oncoming traffic sees us, we also need to make sure we see the road. So Orange-Yellow or Yellow is used. A tip, when in a dense fog switch on your hazard lights.
Position :
Any light placed high up will reflect right into the eyes of the driver. Try this, in dence fog switch to high beam, your visibility will go zilch.
tsk1979 is offline   (1) Thanks Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Are Fog lights banned? prince1a The Indian Car Scene 57 30th November 2016 14:44
Fog lamps without fog dushmish Street Experiences 113 5th January 2012 12:51
Wanted: Fog lights for Optra Boom Shiva Shifting gears 9 1st September 2006 11:19
Best Brands Of Fog Lights vigsom Technical Stuff 5 12th July 2006 22:44
Baleno Fog lights shobhit15 Modifications & Accessories 5 30th August 2005 16:09


All times are GMT +5.5. The time now is 16:47.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks