At Newark Airport, the Lights Are On, and They’re Watching You - NYTimes.com

Green and seen

"What began as a way to help governments and businesses save energy by automatically turning lights on and off has become an expanding market for lights, sensors and software capable of capturing and analyzing vast amounts of data about the habits of ordinary citizens.
The light fixtures are outfitted with special chips and connect to sensors, cameras and one another over a wireless network. Data that is collected — say, a particular car pulling up to the terminal — can then be mined and analyzed for a broad range of applications."

At Newark Airport, the Lights Are On, and They’re Watching You - NYTimes.com