I have the 7" Lucas lens with the asymmetric upper left hand area in the lens.
I assume this is to provide a broad, direct light patch to the left side of the motorcycle while the light towards the right side would be diffused?
This would typically be used in England where they drive in the left hand lane with the curb/sidewalk on the left side.
In any event, I seldom ride at night and on the times I have, the oncoming traffic has not flashed their headlights indicating they are unhappy with my light shining into their faces.