"A new method of delivering data, which uses the visible spectrum rather than radio waves, has been tested in a working office. Li-fi can deliver internet access 100 times faster than traditional wi-fi, offering speeds of up to 1Gbps (gigabit per second). It requires a light source, such as a standard LED bulb, an internet connection and a photo detector..." http://www.bbc.com/news/technology-34942685
