Scar,
HID involves much more than just bulbs; there is a high-voltage power supply that needs to be wired in. Silverstars are just a fancier model of halogen bulbs, same wattage as stock but supposed to be somewhat brighter and whiter. Sylvania also has a "blue" halogen drop-in that is not any brighter than stock but gives the "look" of HID.
HID involves much more than just bulbs; there is a high-voltage power supply that needs to be wired in. Silverstars are just a fancier model of halogen bulbs, same wattage as stock but supposed to be somewhat brighter and whiter. Sylvania also has a "blue" halogen drop-in that is not any brighter than stock but gives the "look" of HID.