LED street light on William between Division and Fifth
National Geographic has an interesting story about Ann Arbor's LED street lights. I've always been a fan of LED street lights--not only are they more efficient than high pressure sodium lamps, they produce higher quality light too--before reading the article though, I never really knew the difficulties involved for a municipality to switch over to LEDs. Specifically, most street lights are owned by utilities and unmetered. When Ann Arbor began switching out its old high pressure sodium lights, DET kept billing the city at the same rate. It is interesting to see stumbling blocks a city encounters when trying to switch over to a more environmentally and economically sustainable product.
This brings me to my question: does anyone know what the little blue lights are for on the backs of the street lights on William between Division and Fifth (picture above)? At first I thought they were LED throwies, but upon further examination I think they may be part of the light.