Street Spectra is a citizen science project to map and characterize public lighting sources. Volunteers use a low cost diffraction grating on top of their smartphones’ camera to take pictures of the street lamps and their emission spectra.

The creation of the project has been motivated by the global switch out of the older street lighting to new LEDs. The database is considered the primary output of the project. It is public and will allow scientist to study the effects of this change on technology onto light pollution.