Besides illumination, LEDs have been finding applica-tions in data communications due to their fast switching time. As an optical source for short-range indoor commu-nications, visible LEDs are cheap and reliable, offering high data rate capabilities. An optical wireless communi-cation link using high-brightness illumination LEDs has been demonstrated to support a modulation bandwidth of up to 20 Mb/s [2]. The theoretical background for visible light communication (VLC) systems is similar to that found in infrared (IR) communications except that VLCs use a much wider visible spectrum, as outlined in [3-5]. In addition, we have seen several practical-based high-speed VLCs reported in [6-9]. Through the use of flashlight LEDs, a simplex link and a duplex link combining the two simplex links have also been reported [7].