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Numerical simelation and design of led grow lamp for plants

Keywords:

S.I. Supelnyak – Post-graduate Student, Department EIU4-KF, Kaluga branch of the Bauman MSTU
E-mail: supelnyak@gmail.com
V.G. Kosushkin – Dr. Sc. (Eng.), Professor, Department EIU4-KF, Kaluga branch of the Bauman MSTU
E-mail: kosushkin@gmail.com
S.A. Adarchin – Ph. D. (Eng.), Associate Professor, Department EIU4-KF, Kaluga branch of the Bauman MSTU
E-mail: adarchin@rambler.ru


The objective of our studies was to investigate the synergistic effect of light-emitting diodes (LEDs) that differ in spectral quality and to design adaptive LED lamp for plants. At present article the prototype of adaptive solid-state lamp developed for the substitution of high-pressure sodium (HPS) lamps used in greenhouses is discussed. Leaf absorption in dependence on plant age for the several stages of vegetative growth was measured using a spectrophotometer. Rely on results of these measurements the numerical simulation of optimal plants illumination spectrum was performed.
Six types of LEDs with emission peaks at 440, 460, 530, 590, 630 and 660 nm were used in our device. The photon flux of adaptive LED lamp was 218, 45 µmol/s. We tested adaptive LED illuminator on transplants of cucumber hybrid «Kurag F1» in greenhouse. For comparison, cucumber transplants were grown under illumination of HPS lamp (Reflux, Russia). Day/night temperature was 35°C, humidity was 80% and a 14-h photoperiod was maintained.
Our investigations revealed that the illumination spectra of adaptive LED lamp provides with an opportunity of efficient plants growth control in greenhouses.

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