HID stands for High Intensity Discharge. Instead of a glowing filament (as in a halogen headlight bulb) an HID bulb has a pair of electrodes with a gap between them, and metallic salts in the quartz capsule with the electrodes. An electrical "ballast" steps up the vehicle's 14-volt line current to several thousand volts to start an arc across the electrodes. The heat of the arc vaporizes the metal salts, which make the arc very much brighter, and that's the light source. Headlamps originally designed, built, tested, and certified as HID headlamps are legal in all 50 states. So-called "HID kits" to convert halogen headlamps are widely available, but they are (all) illegal and dangerous; halogen headlamps mustuse halogen bulbs.
H1
A number of questions have been raised regarding the legality of HID headlights but well informed sites such Motor Field and HIDS 4 U offer a good selection of HID headlight kits which are both safe and legal.
http://www.coolbulbs.com/HID-VISUAL-HEADLIGHT-AIMING-PROCEDURE.pdf
8,000K or 10,000K
H11
silverstar ultra or hid system......
A Hid kit is a higher definition headlight. To insure you are using the correct Hid kit on your vehicle it will be important to visit the High Intensity Discharge FAQ website.
On a vehicle with high intensity discharge headlight, hid, that is an indicator of a failing bulb.
9006 or 9007
It depends on what type of headlights you have halogen or HID?
Yes, but the HID low beam headlight on the 2003 model was an option offered at time of original purchase of the car. However, one can add an aftermarket HID light conversion kit to a non-HID 350z after doing some research.
Don't. "HID kits" are widely available, but they are (all) illegal and dangerous. The only legitimate/safe/legal HID conversion is to install complete HID headlamp assemblies designed, built, tested, and certified as such. Halogen headlamps mustuse halogen bulbs.