Philips Visionplus available at powerbulbs.com It puts out the most actual usable light of any halogen bulb. It is whiter than stock, but not pure white, it has a very slight blue hue when viewed from certain angles. I don't care about light color, justs brightness, and this is the brightest I've found.
It's a halogen/xenon hybrid. Which means halogen style bulb with xenon gas in it to make it brighter. The downside is that it will burn out quicker than a normal halogen bulb.
Side note: I use the philips Weather Vision H3 for my foglights, it's more yellow than most bulbs to cut through fog, rain and snow better. These are also availabel at powerbulbs.com
For more info than your brain can handle, check out:
http://faq.auto.light.tripod.com/headlamp-faq.htm
It's a halogen/xenon hybrid. Which means halogen style bulb with xenon gas in it to make it brighter. The downside is that it will burn out quicker than a normal halogen bulb.
Side note: I use the philips Weather Vision H3 for my foglights, it's more yellow than most bulbs to cut through fog, rain and snow better. These are also availabel at powerbulbs.com
For more info than your brain can handle, check out:
http://faq.auto.light.tripod.com/headlamp-faq.htm