抄録
Plant growth experiments by using visible semiconductor diodes, that is, light emitting diode (LED) and laser diode (LD) are reviewed. It is well known that the spectra needed for green plants growth are red and blue. The central wavelengths of emission spectrum of LED used are 660nm and 450nm. The oscillation wavelength of LD used is 670nm. We grew a plant (sprouting radish) for the first time by using a red LD and two blue LEDs as a light source for photosynthesis. In particular experimental methods and results under pulsed illuminations are described in detail.
