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High-power LEDs for plant cultivation

机译：植物栽培用大功率LED

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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 m~2) 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.
机译：我们报道了用于温室蔬菜栽培的高功率固态照明设备，并报告了由于照明光谱组成的变化而对光合活性和萝卜和生菜的生长形态进行控制的研究结果。基于4种类型的高功率发光二极管（LED）设计了实验照明模块（有效面积为0.22 m〜2），这些发光二极管的发射峰分别在660 nm和640 nm的波长处呈红色峰值（主要被叶绿素a和d吸收）。 b分别表示光合作用），在455 nm处呈蓝色（具有向光性功能），在735 nm处具有远红色（对于光形态学很重要）。比较了在不同的LED基照明器光谱组成的照明下，以及在具有等效光合光子通量密度的高压钠灯照明下，在光控室内生长的萝卜和生菜中萝卜和莴苣的形态特征，叶绿素和植物激素浓度。与使用传统照明的植物相比，发现平衡良好的固态照明可增强绿色物质的产生并确保植物的健康形态发生。我们观察到红色区域中光的光谱组成强烈影响植物的形态和形态上活跃的植物激素的浓度。讨论了基于LED的照明在大规模植物栽培中的商业应用。从能量消耗，可控的增长和食品安全的角度来看，该技术是有利的，但是由于LED的高成本而受到阻碍。为了实现园艺应用，必须实现大规模生产在650 nm处发射的大功率基于AlInGaP的红色LED，并进一步降低在叶绿素吸收峰附近发射的LED的光子价格。

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