PROBLEM TO BE SOLVED: To provide a light source for plant cultivation capable of irradiating light to the whole of each plant and effectively performing photosynthesis, shape formation, sterilization and insect killing indispensable to growth and cultivation of plants. SOLUTION: This light source 2 for plant cultivation has a red color LED 23, a blue color LED 24 and a purple color LED 25 loaded in the recessed part 21 of a nonconductive insulating substrate 22 to hardly produce nonuniformity of light irradiation. Photocatalyst thin films 28 activating photocatalyst by ultraviolet rays are each set on the light-emitting sides of the three LEDs 23, 24 and 25. Photosynthesis and shape formation are effectively performed with the red color LED 23 and the blue color LED 24. The purple color LED 25 and the photocatalyst thin films 28 enable extinction of bacteria, suppression of bacteria reproduction, sterilization, deodorization and insect killing. COPYRIGHT: (C)2006,JPO&NCIPI
