That's two lamps per headlight. Dedicated low and high beams.

I was wrong before... they're 90mm in diameter. The high beam would remain halogen... HIDs are better suited to low beam use and the projectors are perfect for retrofitting since the cutoff is much sharper than reflector.

The image is from www.rallylights.com. Good prices and great service. I've bought stuff from them for almost 6 years now.



And as used in the Saleen S7, picture from Roadandtrack.com