I have been running 100W H3s in the fog lamps for 4 years now. Had problems early on with the stock lamp design.....lens would get scorching hot and when you'd hit a puddle or go thru rain with 'em on, it'd crack the lens. Never had a bulb die....just cracked lens' left and right. So, some time ago I swapped the reflective housing in the lamps with ones out of the Blazer lights and have had NO problems since. Dunno what made the difference, but it works. FWIW, they are quite bright....not the yellow glow of stockers.
Aim the fogs up in people's eyes so that when you switch off the high beams, there's still a bright beam right in their eyes.

- Not the same impact as Dubb's hella-bright lights, but they'll still be like "WTF?". Not that I do that kinda crap or anything.......
Michael