Like 95XL7, I also did the H.I.D conversion kit. Alot of companies and bulbs claim to be HID, but be careful...Alot of the knock offs are really just blue coated glass with halogen and xenon gas. They can actually be less bright than stock halogens....
True HID is a completely different system that has a separate ballast controller, and ignitor to fire the arc lamp. The nice thing about HID is that once it's fired, it settles to a 35W draw, versus 55-65 for traditional halogen. HID puts out about 3x the lumens compared to halogen though, so you get alot more visibililty, and less distortion because the light more closely resembles natural sunlight...HID lamps also last typically 3x as long as halogen..Reason? There is no filament in the bulb like a traditional halogen, so less likely to burn out.
Dowside: The cost...HID conversion kits are significantly more expensive than Sylvania silverstars, or the fake HID bulbs sold at autoparts stores. They are coming down in price, I've seen them on Ebay for $199-400 depending on what you buy....My suggestion is to purchase one that has a lower kelvin rating...You'll see kits with 4300k all the way up to 12000k....Generally, the lower the kelvin number, the brighter the light....Anything less than 4000k is trending towards a very slight yellow hue, while 12000k is a purple color, that isn't as bright..... I have a 5000k on my sidekick, and I have 6000k on my F150...They look identical the the BMW/Mercedes, etc headlights.... I have McCulloch HID kits on both of my trucks, and they've been great....Very reliable!
These kits were plug and play, meaning you take out your old bulbs, replace with the HID bulbs, and then hook your original wiring harness to the HID controller.. The controller then plugs into the bulb....
If you do purchase an HID kit, make sure you point the headlights down a few degrees...The increased intensity of the light, coupled with a reflector designed for halogens can make oncoming drivers blind.....
Hope the information helps!
-Zukisidekick