One of the new lamp posts in my road has a metal plate attached underneath the lamp, presumably to reduce the light entering the upstairs windows of the houses behind. I don't know if the need for the plate was identified in the planning stage (the houses are below pavement-level so the upstairs are lower, relative to the pavement, than 'normal' houses) or whether the residents complained after the lamp post was installed.

Either way, if you do suffer from a floodlit bedroom after the new posts are installed, it might be worth complaining and asking for a metal plate to be attached to the post.