Here's an interesting article to read :
Brighter Headlights They say halogens won't do as much as making sure you're getting full voltage to your lights ... I haven't tried it yet - you need to take a voltage reading at each light itself - but it sounds practical enough.
I put aluminum foil on the inside of my tail light housings and they sure are bright enough ... in fact, I added halogen
Bed Roll Lights to my truck, and they don't look any brighter than my tail lights since I added the aluminum foil.
