Cisco Systems is tightening its relationship with Sensity Systems, a Silicon Valley startup that wants buildings and cities now adopting LED lighting to embrace the Internet of Things. Sensity makes sensors and computers designed to be integrated with LED lights that can go into existing outdoor light fixtures. With Sensity’s gear, the fixtures can do more than light up the streets and parking lots where they’re installed. Its cameras, thermometers and other sensors can tell a lot of stories about what’s going on under the lights. Parking, security and pedestrian traffic are key applications.