I really hope this thread can help you guys. I found it on another site and thought it could save myself and few others the headache of constantly explaining this.

Your're making the road more dangerous than it already is by adding a HID kit to your car. so please do HID the right way by doing a retrofit.

HID kits are illegal due to the glare that they cause. Glare is Light that is emitted in a Uncontrollable path. When light is traveling in a uncontrollable path it can hit other vehicle operators affecting there vision because of the High amount of uncontrollable light that is being Emitted from a HID kit in a standard Halogen housing. If you have ever turned a flashlight on right in front of your face while it is dark out, that is the same feeling that the other drivers on the road experience from a standard HID kit.

OEM Vehicles such as Mercedes, BMW, Audi, Lexus are all equipped with HID or Xenon Headlights. Some use reflector housing’s without projectors. Others use HID projectors.

The Lexus IS300 is a Prime Example of a HID reflector housing. It does not use a Projector. It uses a Specially designed Reflector housing that is meant to use HID. This does not create the Super sharp cutoff. But it does control where the light is being Emitted.

Other vehicles such as the Honda S2000 Use HID projectors, These Projectors are meant to use HID. They are Specially Designed and have been tested Hundreds of times to get the right projection of light while maintaining a Good Cutoff.

Here are pictures of Halogen housings mated with a HID kit

9006 6000k HID Kit... lots of glare:

This 'teg is a prime example of Glare. This is what it looks like to oncoming traffic:

Disaster pix. HID kit in Halogen Housing:

NOW THE GOOD stuff!

This is what HID is suppose to look like.. Pictured is a STi:

Talk about a Razor Sharp Cutoff. Pictured is a S2000 OEM setup:

Comparison.. Pictured is a Acura TL-S with HID from the factory vs H4 6000K civic
See the difference?

Its not just honda's either. Here is a mid 90's Lexus with a HID kit:

Article stating why the kits are illegal.
http://www.nhtsa.gov/cars/rules/rulings/glare.html

To date, NHTSA has investigated 24 HID conversion kit suppliers; all investigations have resulted in recalls or termination of sales.

RM Racing
Astex USA
Kmax International
FET, Inc.
J. Liu LLC
Gourmet Garage
JC Whitney
Lighting Research
SPW Industries, Inc.
Pacific Micro-lite
McCulloch Motors, Inc.
Santeca Electronics
JF Manufacturing
Streetglow, Inc.
Outback Products, Inc.
Nu Performance
GR Motorsports, Inc.
Global Premier
New Clor
Importhookup.com
DG International
MTC Lighting
Umnitza
Liteglow
American Products Company

Here are a few sites to get you on your way to a proper conversion:

Basic HID info:
http://www.intellexual.net/hid.html

Housing disassembly:
http://www.auburn.edu/~fauchpj/headlight.htm

2G retrofit how-to:
http://home.gwu.edu/~nloke/eclipsehidretro.html

Parts:
http://www.hidtech.com./

HID/LED/+more forum:
http://www.hidplanet.com/forums/