[Rick-sta]

When xenon burners are on their way out they start going a pinkish colour and can start going dimmer prior to this stage.

However if your headlights lenses need refurbishing this will be reducing your light output. Also the projector fish eye lenses get coated in a thick layer of dust on both sides of the glass which reduces the light output. The fish eye lenses are cleaned on all the custom headlights I do whilst I have them taken apart.