Has anyone replaced just the bulbs?

[hman969]

Looking to replace my stock headlight bulbs. Do I need to change just the bulb to get more light, or do I need to get a HID hi lo 9700 xenon upgrade kit? One only costs about $40 the other about $150.

What's the difference? I'm clueless about lightbulbs.

Also, if I change my headlight bulbs, what about the fog lights. Seems like they are really *yellowish* and won't look quite right w/ whiter/bluer headlights.

I did a search, didnt' quite find what I was looking for.

Thanks for any help, I really appreciate it.