hahah well, actually my city lights in the same housing as the fog lights are dead and i have not replaced them but i think im going to change them to yellow as well. I'm pretty sure if you use the white city lights with your yellow fog lights, the yellow will overpower the white lights. Give it a try and tell me how it goes, ill change mines soon and we can compare.

 

Yeah after talking to a few people it sounds like the yellow output won't be affected by the white leds so I ended up ordering both a few days ago.