BMW Genuine Bi-Xenon Headlight Head Lamp AKL Left

Xenon headlights offer many advantages over halogen ones: based on noble gas, they provide a much brighter light with less energy consumption and last longer than conventional headlamps.
In addition to the normal xenon lights, BMW now offers xenon light for full and dipped beam headlights, known as bi-xenon headlights. The light for the full beam headlights uses the same light source as the xenon dipped beam headlights: as soon as the driver turns the full beam on, by touching the lever on the steering column, the bi-xenon system folds away a screen located in the path of the ellipsoid-technology xenon headlights beam.

For vehicles from October 2003 with Xenon Light (S522A), Adaptive Headlights (S524A) and White direction indicator lights (S785A).
Represented by part number 1 in the diagram.