RESULTS OF A STUDY OF A COMBINED IRRADIATION DEVICE
The article presents the requirements of lighting and supplementary lighting standards for irradiation devices with the LB-36 lamp type and the red L.E.D. module that are used when growing plants to maintain the necessary microclimate. The article also considers the issue of ensuring enough irradiation of plants in order to create the necessary microclimate in the hothouse conditions. The authors pay attention to the necessity of meeting the norms of lighting adopted in the sphere of plant growing, as well as to ensuring the optimum spectral structure of radiators and illuminators. For the greater reliability of the obtained results, the authors suggest modeling an irradiation device and calculating its spectral structure, so that the efficiency of the light sources used in plant photosynthesis is higher than that of conventional fluorescent lamps of the LD type. It is recommended to use a red L.E.D. source cluster besides the LD-36 lamps. The article presents the results of the study of the spectral structure and radiation density, which were obtained as a result of modeling a combined irradiation device with the LB-36 lamp type and a red L.E.D module. Additionally, the authors suggest adding a combination of fluorescent lamps and a red L.E.D. source cluster to the developed irradiation device. According to the authors, the red portion of the spectrum created by the L.E.D. source influences the plants and accelerates their growth and development, which is confirmed by the results of the experiment, as they have higher yielding capacity indexes when additional red irradiation is used. On the whole, the results of the analysis allows us to make the conclusion that when the above devices were used, there was an increase in the development of the lettuce seedlings of the experimental sample: the weight of the leaves increased by 24%, the height of the samples - by 28%, the width of the samples - by 4%, as compared to the control group.