Maybe it's time for some new bulbs and you could move up to 6000k on the temperature or stay with the 4300k temp bulb. Also, on a 8 year old car you may want to buff the headlight lens as they might be a little cloudy.
__________________ 2001 W208 Black Opal Metallic
K2a, K3, K4 + COMAND, HID halo projector headlights, flat hood emblem, chrome cluster rings, Bluetooth phone adapter, MB illuminated door sills, AMG steering wheel, AMG pedals, chrome AMG II dual spoke wheels, Nitto NT 555 Extreme Performance, 235/35/19 front, 265/30/19 rear
2004 W211 Platinum Blue Metallic
Premium Package, Apperance Package, Keyless Go, Bluetooth puck and tail
Maybe it's time for some new bulbs and you could move up to 6000k on the temperature or stay with the 4300k temp bulb. Also, on a 8 year old car you may want to buff the headlight lens as they might be a little cloudy.
+1...color changes after some time....if the headlights/bulbs were never changed...id assume the color would change together...if ones different, the headlight or bulb was probably changed sometime during those 8 years..?...leaving one new correct color one and one old different colored one
One Xenon headlight looks faded/ is not as bright :( 
Linear Mode
