Mine is losing color on the passenger side also, turning yellow. I bought replacement bulbs and just got them today. I went with 6000k sliding hi/los. Not sure if it's the bulb or the ballast, but I only paid $17 for the bulbs on eBay, and the ballasts are only $30 for a set, so if the new bulb doesn't work I'll buy the ballasts. I'll let you know if the new bulb does the trick here shortly.