Growth of Euglena, a photosynthetic alga, by light emitting diodes

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This paper is a study of the use of light emitting diodes (LEDs) as a light source instead of the sun or fluorescent lamps for the growth of a photosynthetic microorganism, Euglena gracilis, which is classified both as a green algae in the plant kingdom and a protozoan in the animal kingdom. LEDs for blue light of 450nm and LEDs for red light of 660nm were used. For the testing of the growth of Euglena under light, a luminaire consisting of 1064 LEDs on a 230mm (width) ×320mm (height) panel was manufactured, on which 532 LEDs were red and the others were blue. The luminous intensity of each light source was controlled by a power supply separately attached. For full illumination, an electric power of 80W was supplied to the luminaire. These two kinds of lights were introduced to the Euglena in the cultivation vessel. The Euglenagrown by LEDs were about 2 times greater than by ordinary fluorescent lamps. From the results, we concluded that light emitting diodes are not only useful for microalgal-biomass production but also for efficient conversion of electric energy to photosynthetic energy.
生態工学会の論文