Visible light communication
This is a data communication medium using visible light between 400 THz (780 nm) and 800 THz (375 nm). Ordinary fluorescent lamps or LEDs can be used to transmit data for up to 2 km at speeds of up to 500 Mbit/s. TV makers like Samsung think this is future of TV—it was also the past as the first remotes were based on the same concept. To start with, this technology could change the way commercials are aired.