An Adjustable LED Lighting System for Plant Seedling Production in Controlled Environment Systems

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Çağlayan N., Ertekin C.

Tarım Makinaları Bilimi Dergisi (Journal of Agricultural Machinery Science), vol.2, no.10, pp.171-176, 2014 (Peer-Reviewed Journal)


The use of light emitting diode (LED) assimi lation lighting can become an important
player in greenhouse horticulture if energy effici ent LEDs can increase production. However, before
LEDs can be broadly applied in horticulture, more knowledge is necessary on the effects of LEDs on
crops. In this research, a flexible LED light so urce was developed suitable for the research on
photobiological responses of plantlets in greenho uses and growth chambers for research and the
young plant production. The LED lamp allows the difference wavelength, light intensity and light
quality to be controlled as automatic via computer. The components of the LED lamp device include
super bright Cool White (6500 K), Red (620-630 nm), Blue (465-485 nm) and UV-A (390-410 nm),
LED group mounting fixture and drivers. In each LED group, there are 160 Cool White, 192 red, 32
blue and 16 UV-A LEDs. According to the experimental results of LED lamp at 20 cm distance
maximum photosynthetically active radiation (P AR) values of 824.5, 96 7.7, 173.3, 38.2, 1129.3,
1141.3, 1784.5 μmol.m-2.s-1 were obtained for Cool White, Red, Blue, UV-A, Red-Blue, Red-Blue-
UV-A and total of LED groups, respectively.