I'm surprised that reflectors in the US are not more sophisticated, and also that other kinds of light control strategies are not stock, or at least available as accessories. I easily fabricated an aluminum sheet metal cowl for my Light and Motion 350 lumen torch (I know, dim compared to the others these days), clamped it on with a leftover plastic lmount, and wrapped the outside with black duct tape for stealth. When I'm passing other riders, with a slight turn of the light mount the cowl sharply cuts off the beam. I still have light on my path, and the other rider passes in the dark, simple.
