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Proceedings Paper

High-power LEDs for plant cultivation
Author(s): Gintautas Tamulaitis; Pavelas Duchovskis; Zenius Bliznikas; Kestutis Breive; Raimonda Ulinskaite; Ausra Brazaityte; Algirdas Novickovas; Arturas Zukauskas; Michael S. Shur
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Paper Abstract

We report on high-power solid-state lighting facility for cultivation of greenhouse vegetables and on the results of the study of control of photosynthetic activity and growth morphology of radish and lettuce imposed by variation of the spectral composition of illumination. Experimental lighting modules (useful area of 0.22 m2) were designed based on 4 types of high-power light-emitting diodes (LEDs) with emission peaked in red at the wavelengths of 660 nm and 640 nm (predominantly absorbed by chlorophyll a and b for photosynthesis, respectively), in blue at 455 nm (phototropic function), and in far-red at 735 nm (important for photomorphology). Morphological characteristics, chlorophyll and phytohormone concentrations in radish and lettuce grown in phytotron chambers under lighting with different spectral composition of the LED-based illuminator and under illumination by high pressure sodium lamps with an equivalent photosynthetic photon flux density were compared. A well-balanced solid-state lighting was found to enhance production of green mass and to ensure healthy morphogenesis of plants compared to those grown using conventional lighting. We observed that the plant morphology and concentrations of morphologically active phytohormones is strongly affected by the spectral composition of light in the red region. Commercial application of the LED-based illumination for large-scale plant cultivation is discussed. This technology is favorable from the point of view of energy consumption, controllable growth, and food safety but is hindered by high cost of the LEDs. Large scale manufacturing of high-power red AlInGaP-based LEDs emitting at 650 nm and a further decrease of the photon price for the LEDs emitting in the vicinity of the absorption peak of chlorophylls have to be achieved to promote horticulture applications.

Paper Details

Date Published: 20 October 2004
PDF: 9 pages
Proc. SPIE 5530, Fourth International Conference on Solid State Lighting, (20 October 2004); doi: 10.1117/12.565222
Show Author Affiliations
Gintautas Tamulaitis, Vilnius Univ. (Lithuania)
Pavelas Duchovskis, Lithuanian Institute of Horticulture (Lithuania)
Zenius Bliznikas, Vilnius Univ. (Lithuania)
Kestutis Breive, Vilnius Univ. (Lithuania)
Raimonda Ulinskaite, Lithuanian Institute of Horticulture (Lithuania)
Ausra Brazaityte, Lithuanian Institute of Horticulture (Lithuania)
Algirdas Novickovas, Vilnius Univ. (Lithuania)
Arturas Zukauskas, Vilnius Univ. (Lithuania)
Michael S. Shur, Rensselaer Polytechnic Institute (United States)


Published in SPIE Proceedings Vol. 5530:
Fourth International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Steven P. DenBaars; John C. Carrano, Editor(s)

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