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Currently, the problems of using LEDs for plants growing are moving into a practical plane, largely due to the rapid expansion of the use of vertical multi-tiered systems for lettuces and other greens cultivation. The optimal lighting technologies with a reasonable choice of spectra and photosynthetic photon flux density (PPFD) levels should be developed for these applications. The report presents the results of the first phase of a photobiological research, the ultimate goal of which is to optimize the spectrum of LED phytoradiators and the level of PPFD when growing lettuces and other greens in greenhouses and vertical multi-tiered installations for plants cultivation under photoculture conditions. The results are presented as a series of productivity light curves (action spectra) for lettuce and basil plants when irradiated with a quasimonochromatic light in three PAR ranges: blue, green and red. In the experiment, the levels of PPFD varied over a wide range (70 ÷ 230 μmol/(s∙m). “Rough” spectra of plant productivity are presented for two different levels of PPFD (70 and 100 μmol/(s∙m )).

PHOTOBIOLOGICAL RESEARCHES - A WAY TO OPTIMIZE LED’S PLANT LIGHTING