Fog lights are not "driving lights".
I very much agree with TSpecht. I sometimes run only the fog's in the snow storms or fog. The low beams refect back so much you can't see anything but a 'white-out' in front of you in those conditions.
Fog lights are for driving in fog, rain or snow. Not for driving on clear nights.
Most Americans don't realize thats how they are supposed to use them. What you want if you don't like the hi/low beams on your truck is some true DRIVEING lights, which are different from fogs. The differences are the reflectors/lenses in driveing lights put the light out in front in a narrower beam, while fogs spray light low to the ground, but in a wide pattern.
The fogs were designed for a purpose- To put light low to the ground, at a wide angle, and not up in the air. The reason for this is that fog, snow, ect will reflect back the light that hits it, which is not what you want to see.
The are to see "under" the fog and snow. You want to see the road and things comeing at you, not the light bounceing back from the fog or snow up high in front of you!
Another thing. . The fogs in my old '87 300SDL mercedes were amber, to reduce glare and penetrate the fog better. They did a good job.
Makes me wonder what people are thinking when they run those K-mart special bulbs... (the "blue light specials"). Guess they didn't pay attention to the studies done on lighting and glare... oh well.
Fog lights are not supposed to be run at the same time with the high beams, or the low beams. If you look up the driving laws in Nebraska, you will find that it is against the law to do so here, even though a lot of people get away with it.
Its a fine, To the tune of at least a $65. 00 fine (maybe even more, as this was 4-5 years ago a friend got ticketed) for "having more than 2 forward white lights on when meeting" someone. You are supposed to shut off fog's when you meet someone, just like your high beams... I really wish that it was enforced here more than it is.
The sad truth is, fog lights spray a wide beam, and thats not what you want if you are unhappy with the low/high beam units on your truck. Fogs will only put "usable" light down close to your truck. IF adjusted otherwise-The rest of it just goes to shine into any oncomeing traffic and and helps to wreck their night vision.
So If you really can't see something until it gets in the fog light pattern, you had better only be driving 35 MPH, or you will be sitting on top of what ever it is that you see before you have a chance to react to it. If thats not the case, then turn them off. . you don't need them then. Either that or you have them grossly misaligned and you deserve to be brighted. .
Just my 1/4 cents (adjusted for inflation).