Now that I've collected my Q7 and fiddled with the controls, the headlights operate like the TT I had. The HID's are a single lamp.
When the headlamp flash or main beam is selected the lamp is tilted using the motors.
You'll notice when you first switch them on, the headlamp does a little dance and sets the headlamp beam level each time they are turned on.
HID lamps take a few seconds to warm up so it's quicker to move the lamp than switch another lamp on.