PROBLEM TO BE SOLVED: To provide a distributed-type plant cultivation system capable of efficiently systematizing management of the entire plant factory at low cost and with a long life.SOLUTION: A distributed-type plant cultivation system 1 of the present invention comprises a plurality of power source light control units 2, 2, ..., arranged in a distributed manner for each fixed area, and cultivates plants by irradiating the plants with an LED light which is pulse-modulated by each power source light control unit 2. Each power light control unit 2 is connected to respective phases of a three-phase AC power source 4, and includes: a three-phase full-wave rectifying circuit 5 for performing full-wave rectification of an AC voltage of each phase inputted through an insulation transformer 11 a three-color LED illumination circuit 6 connected to the three-phase full-wave rectifying circuit 5 and comprises red, green and blue LEDs which light up by a full-wave-rectified pulsating current a pulse light control circuit 7 connected to the three-color LED illumination circuit 6, turning a current outputted to the three-color LED illumination circuit 6 ON/OFF on the basis of a PWM-controlled light control signal, and performing light control by pulse modulation individually for the red, green and blue LEDs.SELECTED DRAWING: Figure 2
