What amazes me that Facebook and Google has faces and identity of 99% population and could be solved in an instant. FB even used to auto-tag people for you if you upload their photos. Probably still do internally. Solving a crime is like one checkbox away. Yet "the privacy" of doing crime is more important.
This might be reflected in a rise of crime rates, as I suspect that criminals prefer not to commit a crime if they know for sure that they will be caught. Likewise if they know that they will be confronted.
The light still works as a deterrent because the light makes them visible to a potential occupier. They'll fear real, immediate confrontation/violence, not some lazy policeman looking 5 minutes at the picture before moving onto something easier such as kids dealing weed.