no its not the ballasts, its the bulbs. well, its the amout of gasses in the bulbs is what makes the color what it isi dont think the bulbs will make it change, do belive its all in teh ballist
if i didn thave these stupid projector headlights i would do 6000k HID, nice pure white light
i think mine are either 7k or 8k...got them to stay...still pop out if i hit a HARD bumphehe i love my blue 10k's