a little yellow shiled is definately not necessary. i got yellow fog light bulbs for my accord since the housings are clear. they're REALLY yellow. i wouldn't say lexus yellow - they don't have the same kind of gleam, but they still have a ton of color. i love em! i think maybe different makers might make a better yellow color, one that matches the lexus fog lights a little better. i always thought a good set of yellow ions should do the trick.