For the Americans, if you ever look up how to adjust your headlamps yourself, you'll see that, as well as the beams having to be below a certain height (actually an angle of elevation), the beams are aimed slightly to the right, i.e. slightly away from oncoming traffic, so you don't blind drivers coming in the opposite direction.
As well, headlamps are designed to have asymetric pattern to the beam, the "dipped beam" that onebirdyman was talking about. Basically the beam has a "Cut-Out" portion to it, that keeps it from throwing light on the oncoming traffic side of the road, but spreads out everywhere else.
So I guess, these converter patches you speak of, are some sort of Opaque Patch you put over your headlamp, that blocks the headlamp beam from extending into oncoming traffic? Basically makes a cut-out of the beam for the new traffic pattern?
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