Does my 2003 Saab 9-3 Arc need a bi-xenon or xenon headlight bulb?

[Kris]

It has projector headlights, and high and low beam both emit light out of the same projector. I was wondering if you need a special "bi-xenon bulb" or would a regular "xenon" bulb work as well?

Since the high and low beams come out of the same projector, i was thinking that the light is constant anyways because high and low is affected by a motor that lifts a shield letting more or less light out for high and low beams. So i don't know if there is a special bulb or not