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Originally Posted by Raddman
 "makes it worse actually" Just would like to know where you get all of your miss-information from?  actually its just your opinion isn't it?  "night time that light will prevent you from seeing things clearly at a distance"  thats what your headlights are for  I don't know about other cars but my 03 rolla S fog lights illuminate out at least thirty feet and light up the road that my headlights don't. they both compliment each other and fill the voids that head lights miss  I believe any more lights is better light...JMHO  ....Raddman
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I don't want to take issue with the use of foglight. But it seems necessary to distinguish between fog light and driving light first. To the best of my knowledge, foglight should create a wider, not longer, beam pattern, and is not intended to illuminate farther than the headlight.
If our purpose is to have a light shooting farther than the headlights are capable of doing, we're talking about "driving light," not foglight. If the weather is foggy, such light may not be of much heap. The mist will block (or even reflect back) the light aimed far away. In this situation we need a foglight, which helps illuminate the nearby lines, reflectors and roadsigns. The lower color tempeature is more appropriate for the foglight.
I agree on the suggestion that, theoreticaly, too strong light near the bumper causes higher contrast between the light nearby and the outer light, thus making illumination at a farther point "looks" worse (the actual lumens remain unchanged). But in practice, if the original headlamps are lousy (like the terrible 9004 on my corolla), even foglight is a great deal helpful. The 9004 headlamps cannot even take a good care of the nearby area, which the headlamps are supposed to be responsible for.
Hella uses the same lamps to meet the function of either foglight or drivinglight. Please take a look at
http://www.rallylights.com/hella/ff075.asp , and we can know how different they are.