Are you interested in Visible Light Communication (VLC)? This invention protects the use of at least two radiation sources to achieve an increased transmission rate. The invention also covers the use of infrared or ultraviolet radiation sources. This makes it possible to use a phase relation between the radiation source for emitting non-visible light and at least one further radiation source for transmitting at least a portion of the data. This can result in improved reliability. Plus, ultraviolet radiation does not penetrate through glass. Nobody can "listen" to the communication from the outside. The patent is active in Germany, France, Italy, Spain and Switzerland. It has counterparts in China, Japan and Korea.