Yes, the light I am interested in changing is to see in night on bike trails. I was looking at the beam profile of these German lights and it does look much better than a regular flash light or even lights sold for use on bicycles, many of which tend to produce a large circle of illumination and surely, the people in oncoming traffic can’t be happy about it. I recall when HID lights were first introduced in German cars, the US authorities were very concerned about the scattered light that might blind oncoming traffic and wouldn’t allow them in US. Once the projector lamps and suitable optics was incorporated, the problem was solved. We are essentially seeing a smaller scale adaptation of similar principle for bicycles. From what can guess, they are doing it by fresnel lenses. Cutting off the distant illumination beyond a certain point, like low beams in cars, is an excellent idea.