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White LEDs offer advantageous properties such as high brightness, reliability, lower power consumption and long lifetime. The biggest potential application for white LEDs is general illumination and lighting. Indoor wireless optical communication systems employing white LED lighting have been proposed. This system is able to offer high QoS due to the high power from this lighting equipment. However, it is difficult for existing offices and households to install the communication cable to the ceiling. An easy wiring system for optical communication using existing power-lines is proposed. This system is emitted as visible-light from LED lighting according to the transmitted signal waveform without demodulating the signal from the power-line. This system is expected to be applicable from the existing lighting easily like exchanging electric bulbs. This integrated system can have a big impact as a new signal transmission system and its economical effect can be great. The basic performance of this system is analyzed. The actual system is built and its feasibility is shown through experiments.