I have true hid fogs already in my truck, 5000k isnt yellow, thats supposed to be white... 3000k is yellow. I have 6000k currently and am going to buy 3000k bulbs to go in place of my 6000k bulbs for winter. I have the real deal hid's with a ballast, true xenon gas and all. Its already set up currently due to my having hid's in there already, I just have to switch the bulbs out and plug them into the ballasts.

 

Yes. my halogens are 2400 Ks.