I've changed my fog lights to hyperwhite bulbs. If the screws aren't stripped like mine were it's easy. If I remember, there are three screws that hold them the housing together. If they are stripped, it's a biotch. It totally sucked for me to replace them. Actually one burned out afterwards and I replaced it with a different color on accident. Now I have two colors for fogs, but they closely match.
The difference b/t the three colors are nothiung more than the amount they are tinted blue. They go in the order you mentioned from more blue to less blue. Just realize that in most states blue headlights are illegal, but halogen lights aren't. There is a difference.
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