Problem with color of Xenon Lights
 

2000 Boxster S org came with factory installed Xenon lights.

One of the headlight was damage and need to be replace, however, the new one seems to be have a light green tint coat on the lens or may be the light bulb itself is green. The old one is more white and clearer than the new one. Could that be different type of xenon light set out there? or mine just old after 6 years? Or buying another new xenon light bulb by itself will fix the problem?