http://www.iflscience.com/technology/li-fi-internet-could-be-100-times-faster-wi-fi-0

Li-Fi, which was first invented by Harold Haas of the University of Edinburgh in 2011, usesvisible light communication (VLC) to send data at extremely high speeds. Essentially, this works like an incredibly fast signal lamp, flashing on and off in order to relay messages in binary code (1s and 0s). In previous lab-based experiments, the technology was able to transmit up to 224 gigabits per second. To put this in perspective, Wi-Fi is capable of reaching speeds of around 600 megabits per second.