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

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

doi:10.3390/su13084329

Abstract

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 200 W laboratory luminaire with a pulse-width switched-mode power supply.

Highlights

The light spectrum is a key driver of the photosynthetic processes that are responsible for plant growth, which require about 50% of the waveband of the solar light spectrum that is available in the lower atmosphere [1,2]
The monoobjective particle swarm optimization (PSO) technique is applied to match the target spectra. This simple optimization approach of Light-emitting diodes (LEDs) luminary radiation can be used for any particular target application, provided that the latter is reliable
Despite their importance for photosynthesis, altogether blue and red wings are insufficient to irradiate all types of plants

Summary

Introduction

The light spectrum is a key driver of the photosynthetic processes that are responsible for plant growth, which require about 50% of the waveband of the solar light spectrum that is available in the lower atmosphere [1,2]. Light-emitting diodes (LEDs) are by far the most promising technology for artificial lighting dedicated to plant cultivation [6,7]. They are mercury-free and combine less radiation loss with an enhanced longevity while affording a good robustness with smaller packaging [8,9,10]. They entail significant energy savings [11] compared to the less efficient discharge lamps [12,13]. Their recent rapid progress is expected to induce an increase of more than 180% in the horticulture lighting market over the five years [14]

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Conclusion