Tunable multiple-LEDs combination spectrum for plants based on McCree PAR spectrum

Bachouch, Latifa; Dupuis, Pascal; Sewraj, Neermalsing; Canale, Laurent; Zissis, Georges; Bouslimi, Lotfi; Amraoui, Lilia El

doi:10.1109/eeeic/icpseurope49358.2020.9160753

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…We supply each LED with 280 mA in order to determine the amount of LEDs required for each family. This current value results from the 200 W LED luminary target-power of our future Buck power supply, which is limited to an output current of 1.4 A, according to a former survey work performed at the EI & ICT ENICarthage laboratory [76][77][78]. The corresponding supply output voltage is 143 V. We need to verify that this new current value does not bring any significant drift on the target spectrum.…”

Section: Modeling Light Distribution Of Monochromatic Ledmentioning

confidence: 99%

An Approach for Designing Mixed Light-Emitting Diodes to Match Greenhouse Plant Absorption Spectra

et al. 2021

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We report a methodological approach for simulating luminary output radiation, which is achieved by mixing light-emitting diodes (LEDs) in order to match any plant absorption spectrum. Various recorded narrow-band LED spectra of different colors were first characterized and then fitted with a multi-Gaussian model. An optimizing procedure computed the optimal weighting of the relevant parameters so as to minimize the discrepancy between the combined spectrum and the reference target curve. The particle swarm optimization (PSO) method was applied because it is the most suitable technique for mono-objective situations. Within the useful spectral interval, the worst relative standard deviation between the optimized curve and recorded LED spectral power distribution (SPD) was 3.4%. When combining different LED types, the simulated light output showed that we could limit ourselves to selecting only five colored sources. This work will help us to design an optimized 200W laboratory luminaire with a pulse-width switched-mode power supply.

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Section: Modeling Light Distribution Of Monochromatic Ledmentioning

confidence: 99%

An Approach for Designing Mixed Light-Emitting Diodes to Match Greenhouse Plant Absorption Spectra

et al. 2021

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“…Horticultural LED lighting and its effects on crop growth have been investigated by several authors [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14]. Research on LED crop lighting dates back to the 1980's, with red-only lights used in the international space station, to high-density multi-spectral LED chip-on-board devices in recent years [4], [5].…”

Section: Introductionmentioning

confidence: 99%

“…In [13], the authors discussed how spectral quality of LEDs can dramatically affect crop anatomy, morphology, nutrient uptake, and pathogen development. In [14], an adjustable spectrum LED was presented to match the plant's spectrum based on the relative quantum efficiency [2]. In [15], the authors provided a review of research activities related to LED lighting and highlighted issues such as plant cultivar-dependent recipes and cost analysis.…”

Section: Introductionmentioning

confidence: 99%

An Energy-Efficient PAR-Based Horticultural Lighting System for Greenhouse Cultivation of Lettuce

Mohagheghi

Moallem

2023

IEEE Access

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This paper presents an intelligent horticulture lighting and monitoring system to achieve energy-efficient supplemental lighting while maintaining the light quality and intensity at desired levels in the photosynthesis spectrum. Energy-efficiency is achieved through delivering only the required net light intensity, consisting of sunlight and supplemental LED light, using an intelligent controller that does not depend on the lighting system model. To this end, an online neural-network learning control system is developed, comprised of low-cost light sensors for measuring the photosynthetic photon flux density (PPFD), dimmable LED light fixtures, cameras, and internet-of-things (IoT)-enabled firmware used for crop monitoring and performance evaluation. Experiments performed in a research greenhouse facility on the lettuce crop are presented which indicate that the system can deliver the desired Daily Light Integrals (DLIs) to the plants in the presence of changing daylight conditions. The proposed method can thus deliver the exact amount of light to a specific crop based on the required light recipes during different growth phases. The control performance is further compared with a conventional on-off time-scheduling method in terms of plant health, growth, and energy requirements. The experiments indicate that the proposed solution can reduce energy consumption per unit dry mass of lettuce by 28% when compared to existing time-scheduling methods.INDEX TERMS Daylight harvesting, energy-efficiency, horticultural lighting, Internet of Things, machine learning, neural networks, PAR measurement.

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Method of matching different background spectra based on spectrally tunable light source

Yang

Zhang

et al. 2022

Opt. Eng.

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Tunable multiple-LEDs combination spectrum for plants based on McCree PAR spectrum

Cited by 3 publications

References 12 publications

An Approach for Designing Mixed Light-Emitting Diodes to Match Greenhouse Plant Absorption Spectra

An Approach for Designing Mixed Light-Emitting Diodes to Match Greenhouse Plant Absorption Spectra

An Energy-Efficient PAR-Based Horticultural Lighting System for Greenhouse Cultivation of Lettuce

Method of matching different background spectra based on spectrally tunable light source

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