And that horizontal cut-off is so clean..you back up off a wall at 10 meters and you can see it as plain as if someone drew it on the wall...Real Optics...

When I used to set them up for aiming, I would use a level and ruler, mark the wall with duct tape at a 3" drop and I could zero the vertex of the cut-off angle in right to the inch...Very Cool.... That cut-off was Identical on each side , too. [ A trick for more road light w/o offending oncoming is to fudge the right lamps vertex an inch to the left of lamp C/L...and just the opposite if you have RHD }

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A Dalton