These lights aim too much of the light horizontally, which has a number of problems, the largest of which is that their light is the same wavelengths as bike lights so it renders cyclists invisible. 

To make matters worse, some noncyclist in Parks and Open Space (their acronym says it all) approved a project to put these lights on the bike path, and I do mean on. The concrete rounds are on the edge of the road and the poles are one to three feet from the edge, often on the inside of curves or where there is a tendency for icing. These unnecessary lights thus create a serious hazard for cyclists on the bike path. (Best practices are to keep a minimum of four feet with a recommended six feet clear zone at the edge of bike paths.)

Of course the only place on the bike paths that aren't lit are the underpasses where the bums sleep at night.