Provided is a novel illuminating light communication system which makes it possible to transmit a large capacity data at a high speed. A transmitting device (1) outputs modulated light, which is modulated corresponding to data to be transmitted, from an organic EL light source (4). A light receiving device (2) receives the modulated light outputted from the organic EL light source (4), converts it into an electric signal and demodulates data from the converted electric signal.
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