Significant reduction in energy for plant-growth lighting in space using targeted LED lighting and spectral manipulation

Poulet, Lucie; Massa, Gioia D.; Morrow, Robert C.; Bourget, C. Michael; Wheeler, Ray; Mitchell, Cary A.

doi:10.1016/j.lssr.2014.06.002

Cited by 100 publications

(65 citation statements)

References 32 publications

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“…In a controlled environment, in response to requirements for optimal light quality, quantity, and distribution, light-emitting diodes (LEDs) have been proposed as a promising light source for plants [1], either as a main or supplementary light source [2], and for space-based plant growth [3,4]. Compared with light intensity and photoperiod, light quality filters have much more complex effects on plant morphology and physiology.…”

Section: Introductionmentioning

confidence: 99%

Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality

2017

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Abstract:In a controlled environment, light from light-emitting diodes (LEDs) has been associated with affecting the leaf characteristics of Eustoma. LEDs help plant growth and development, yet little is known about photosynthetic performance and related anatomical features in the early growth stage of Eustoma leaves. In this study, we examined the effects of blue (B), red (R), and white (W) LEDs on the photosynthetic performance of Eustoma leaves, as well as leaf morphology and anatomy including epidermal layer thickness, palisade cells, and stomatal characteristics. Leaves grown under B LEDs were thicker and had a higher chlorophyll content than those grown under the R and W LEDs. Leaves under B LEDs had greater net photosynthetic rates (A), stomatal conductance (g s ), and transpiration rates (E), especially at a higher photon flux density (PPFD), that resulted in a decrease in the intercellular CO 2 concentration (C i ), than leaves under the W and R LEDs. B LEDs resulted in greater abaxial epidermal layer thickness and palisade cell length and width than the R and W LED treatments. The palisade cells also developed a more cylindrical shape in response to the B LEDs. B LED leaves also showed greater guard cell length, breadth, and area, and stomatal density, than W or R LEDs, which may contribute to increased A, g s and E at higher PPFDs.

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Section: Introductionmentioning

confidence: 99%

Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality

2017

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“…This consideration confirms that CL seems to be most suitable for spinach plant growth compared to WL, from both the development and energy efficiency points of view. Results of Poulet et al [31] indicated that the energy consumption per biomass produced using white LEDs was similar to that of red+blue LED treatment. Nevertheless, other studies in the literature demonstrated that monochromatic blue and red LEDs are more efficient than white LEDs from the luminous efficiency considered as the ratio between light energy output and electrical energy input [41].…”

Section: Discussionmentioning

confidence: 84%

“…The selection of the correct light source allows the maximization of the vegetable production, optimizing, at the same time, the electrical energy consumption of greenhouses. The experiments of Poulet et al [31] demonstrated that even the absolute energy request was lower in the lag period than in the successive growth period, as the energy spent per unit edible biomass (kWh/gedible), as well as the energy for the unit of biomass produced (kWh/gtotal) in Lactuca sativa, were higher in the grow phase.…”

Section: Lighting Conditionsmentioning

confidence: 99%

The Impact of Spectral Composition of White LEDs on Spinach (Spinacia oleracea) Growth and Development

2017

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Light-emitting diodes (LED) are a promising light source for the cultivation of edible vegetables in greenhouses. The spectral radiation of the light sources has an impact on plants physiological parameters, as well as on morphological features. In this study the growth of spinach plants has been carried out in experimental boxes under two white LED treatments having different correlate color temperature (CCT): the cold lighting (CL) corresponded to 6500 K, while the warm lighting (WL) to 3000 K. The work was aimed to investigate the influence of the two light spectra on plant development and comparing the results. Results showed that the different lighting treatments impact differently on plant development and on growth parameters.

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“…In this case, artificial light for plant cultivation is needed, and a technique to reduce its energy and enhance its efficiency is also required [2]. It is also used in conjunction with renewable energy systems, such as offshore wind power generators incorporating plant cultivation systems [3].…”

Section: Introductionmentioning

confidence: 99%

“…Ref. [2] reduced power by optimizing the spectral parameters of the LED. Specifically, in order to optimize the spectral parameters, it compared the energy efficiency in the target illumination system with different red and blue ratios of the LEDs.…”

Section: Introductionmentioning

confidence: 99%

Power Controllable LED System with Increased Energy Efficiency Using Multi-Sensors for Plant Cultivation

2017

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Abstract:In this paper, a power-controllable light emitting diode (LED) control system is proposed for plant cultivation. The proposed LED system measures environmental data, such as the distance between the plant and LED system using an infrared sensor and the ambient illuminance based on an illuminance sensor. Then, it converts the illuminance to the photosynthetic photon flux density (PPFD) for plant cultivation. It analyzes the relationship between the data and LED PPFD, and generates an optimal pulse width modulation (PWM) signal. Therefore, it controls the LED PPFD dynamically. The proposed LED system is also implemented in hardware, which consists of red and blue LED arrays with suitable wavelengths and a micro-controller. In the experimental results, the proposed LED system preserved the target PPFD regardless of the change of the distance and ambient PPFD. Additionally, the proposed LED system maximally reduced the power consumption of a conventional system by up to 68%.

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Significant reduction in energy for plant-growth lighting in space using targeted LED lighting and spectral manipulation

Cited by 100 publications

References 32 publications

Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality

Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality

The Impact of Spectral Composition of White LEDs on Spinach (Spinacia oleracea) Growth and Development

Power Controllable LED System with Increased Energy Efficiency Using Multi-Sensors for Plant Cultivation

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