Still have the same headlight bulbs in the Vibe that it left NUMMI with some 4,163 days ago. A map light and a new bulb for the CHMSL is all it's had replaced.
Anyway, I have noticed the headlamps are getting quite dim. There's the typical yellowing of the housings, which I polished the heck out of today. But I'm contemplating throwing a new set of bulbs in there to see if that helps. Haven't decided what to put in there yet but it will probably be more along the lines of a standard bulb. If I can find some sort of "upgrade" that doesn't have any sort of coating on the bulb, I may investigate.
When I had my Vibe back in '03, the first thing I did was throw $ilver$tars in, which was a costly mistake as their longevity was abysmal.