How will our buildings change when your mobile device can receive huge amounts of data flowing from the luminaires above you? Not only has LED brought us a highly efficient light source, but a promising instrument for visible light communication (VLC) as well. Therefore light will not only be a medium to support vision, but it will also be an essential means of data communication. With the low energy consumption of LED one can even set up luminaires without mains cables for the power and just install Ethernet cables. Welcome to the world of digital lighting.