I hate to do it, but I have spoken with some neighbors about that. They get it, but it's funny they don't think about it on their own that they might be annoying their neighbors with their lights.
I've spoken with them. one has no objection to me installing some kind of deflector at the light to shield my property.
the other, however, will not let me do this: they are the hospital, the lights cover thei lot, and they have had crime problems there, so i won't push it.