The brighter you go with your fogs, the less functional they become. They are dim like they are to avoid reflecting off moisture (fog) and to allow you to see by cutting through and under fog. So while they may look cool when you brighten them up to match the headlights, they lose most of their function.

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Current Bimmer
2004 X5 4.4i Sterling Grey Sport/Premium

Past Bimmers
1991 318I Alpine White
1995 740I Alpine White
1991 525I Schwartz
1998 323IS Scwartz
2004 330CI Cabrio Titanium Silver Metallic
1995 540I Schwartz
2000 Z4 3.0 Titanium Silver
2000 330ci Coupe Titanium Silver