I want to add that LED lights are becoming widely used for homes and offices for their luminous efficacy improvement. Visible light communication (VLC) is a new way of wireless communication using visible light. Typical transmitters used for visible light communication are visible light LEDs and receivers are photodiodes and image sensors. We present new applications which will be made possible by visible light communication technology. Location-based services are considered to be especially suitable for visible light communication applications.
You may check these papers for further study.I hope this will be helpful.
http://www.ieee802.org/802_tutorials/2008-03/15-08-0114-02-0000-VLC_Tutorial_MCO_Samsung-VLCC-Oxford_2008-03-17.pdf
http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6533776&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel7%2F6526700%2F6533752%2F06533776.pdf%3Farnumber%3D6533776
Thanks