Headlights are dim.

[chillinrfc]

I just picked up a '00 2.7 Boxster. At the time, I saw the headlights during the day and they seemed fine. However, at night, the headlights turn on but are so dim that I cannot see the road. Currently, I am driving with the foglights.

What do dim headlights mean? Is it electronic, requiring a trip to the dealer/mechanic? Or can it just be old bulbs? It doesn't look like the headlight housing is dirty or anything. I have standard, non-litronic lights.

Thanks