Interesting solutions for controlling light via wireless lan,
from Greenwave Reality or Philips Hue.
Both use a gateway that must be connected to your home wifi-router and controls the light bulbs.
With apps for some mobile devices you can switch them one, select a scene or program a time schedule.
The communication between the bulbs uses IPv6 meshes with the Greenwave technology and ZigBee inside the Philips solution.
WiFi LED lighting