I got some smoke colored translucent fog light covers over the summer, and when I put them on, the fogs basically became useless! I put 100 watt bulbs in and increased visibility pretty much back to normal, but when I took off the covers, the "shield" part that goes in front of the bulb had kind of browned and had a rainbow-ish effect to it. I have since taken the covers off, but I want to put them back on for the winter and have the fogs functional rather than cosmetic, but I don't really want that area to get any worse. Anybody else had this problem? I was thinking about trying to find some 75 or 80 watt bulbs, but I'm not sure if they are available. Any suggestions? Thanks!