That's right ... its a single HID on a rocker.
They all do it that way (or move the lens) because a HID is basically an 'arc light' in a controlled atmosphere and its 'startup time' (time to full brightness) is about 5 seconds.
So to achieve a rapid transfer from dip to full beam you have to move either the bulb or the lens.
Google "Bi-xenon" for more information.
When mine arrived I didn't believe it, so I took it apart and found ........A solenoid!!
Then I looked closely and discovered there was only 1 capsule. Then it all became obvious.
Now I have 2X Chinese HIDS on my Mk1 Fazer and its Bloody marvellous. It adds a whole new dimension to night riding.
Previously I have seen rows of reflective bollards as faint yellow things.
Now I see them and think ..."Which fool put a row of bright white lights THERE?! ... Ah!
Basically, I can now see where the edge of the road is.
Before, I was feeling in the dark at any speed over 60 despite having modified it to have 2X Halogen main beams.