A little hard to find on their site but this is from 
Preformance Products, I saw it in the November "Excellence" 
magazine p. 31. I like my H4s but if you have an extra $600 
burning a hole in your pocket... 

Sylvania Xenarc HID Lighting System
- 7" Round Lights
- Improves peripheral and down-road vision
- 3 times more light than halogen systems
- Lasts up to 10 times longer than halogen bulbs

Until recently you had to purchase a high-priced luxury 
import to enjoy the many advantages of High Intensity 
Discharge (HID) lighting systems. Sylvania, a world leader 
in lighting technology has introduced its XENARC� HID 
replacement headlight system and low-beam lighting systems 
that are easily retrofitted to your vehicle and are very 
affordable. HID arc-generated light is whiter, brighter and 
100-percent DOT certified and street legal. The XENARC� HID 
system increases peripheral vision by 50-percent, and 
greatly enhances down-road vision to help prevent 
overdriving the headlights. Featuring a 3-year warranty, 
these lights are a must-have for anyone who does a lot of 
night driving. 

Here is the direct link but its a long one:
http://www.performanceproducts.com/product_page.asp?
attFlag=1&appFlag=0&productname=Sylvania+Xenarc+HID+Lighting+
System

Usual disclaimers

Thanks,
Chris