Location based ligthing in offices

This concept is useful particularly for IT companies.
Every person has a Laptop/PC and has an IP address. The concept is to control the light from a central system based on if the system is pingable.

The light can be always on during the working hours, since it increases the ambient light of the surrounding, but after the working hours a centralized server can ping the systems and then inform a Light controller to switch on or off the light.

The control can be made based on bits and the server can send a numeric based on what bits to set and what not to

For e.g.
controller can have memory and each bit in memory represents a particular light source.
The central server which pings the PC/Laptop can format the bits and send it to the controller.