Seralarda fotosentez amaçlı kullanılan farklı LED ışık kaynaklarının FAR dağılım düzeylerinin belirlenmesi

Objective: In this study, it is aimed to determine the PAR distribution of different types LED and the arrangements that could make the working efficiency in the LED light sources. Material and Methods: Four locally produced LED developed for greenhouses have been considered. The PAR measurements were carried out within the specially designed a testing unit in a dark room in 10×10 cm square grid within 3×3 m dimensions. The height between the PAR sensor and the LED was considered as 31.6, 50, 75, 100, 125 and 150 cm. In the evaluations, different uniformity coefficients were calculated and PAR distribution patterns were determined for different mounting height and spacing. Results: The minimum and maximum daily light integral values for A, B, C and D LED were found 23.8-9.3, 13.8-3.6, 2.1-1.3, 2.2-1.1 mol·mday, respectively. In terms of daily light integral, it can be said that A and B LED can be used in both full artificial and supplementary lighting and, C and D LED can be used only in supplementary lighting for PAR applications. Conclusion: It was determined that all LED had acceptable PAR uniformity according to the different distribution uniformity criteria for over 100 cm mounting height and spacing. Araştırma Makalesi (Research Article)