Hi BigJon, so far from what I can see, the lights just ( literally ) raise and lower physically when high or low beam is selected.

Whether it’s the light itself that moves up and down or some sort of shade, I haven’t worked it out yet but with the D3 facing a wall and when the D3’s high beam lights are covered, changing between low and high causes the low beam light to move up and down on the wall.

As the shape of the light beam also changes, from a half moon shape in low beam to a near full circle in high beam, I'm not sure what causes this change.

Cheers