I aim it inside the hallway shining at the far wall. As long as the bright spot is lower than the light itself it won't be shining directly into the drivers' eyes.

Our lights are not designed to shape the light beam, like auto headlights are, so even when aimed low if they look directly into it they will still see a bright spot. We can't really do much about that unless we're willing to buy some expensive, relatively dim lights sold in Europe. Or embark on some DIY modifications.