If they are supposed to help you see better in fog, or to illuminate the road below and to the sides of the low beam pattern, mine are too dim to do either.
They really make very little difference when they are on -- in the dark, and in the fog. Maybe they are aimed wrong from the factory, but I cannot tell much difference when they are on.
If you are going to tell me that they have to be dim, to work in fog, that is just plain dumb.
If they were brighter, they might serve a purpose other than being marker lights, which is what they are right now with the factory bulbs (what are they, 35 watts of pure fog busting power?)
Would I prefer brighter bulbs, even if it hampered their current non-ability to cut through the fog?
Yes, and so would most of us who think they suck. See how that works!