A new approach to environmental impact studies and lifecycle assessments for horticultural lighting systems

Autor: Bertin, K, Zissis, Georges, Raynham, P, Moutsi, A, Mucklejohn, S, Preston, B
Přispěvatelé: Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Lumière et Matière (LAPLACE-LM), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), University College of London [London] (UCL), Ceravision Ltd, LightCampus, Région Occitanie, FEDER, Zissis, Georges
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: IXth International Symposium on Light in Horticulture
IXth International Symposium on Light in Horticulture, May 2021, Malmö, Sweden. 2021, Proceedings of IX International Symposium on Light in Horticulture
Popis: International audience; The authors introduce a new approach to quantifying the environmental impact and lifecycle assessments for horticultural lighting systems based on functional units expressed as the products of photosynthetic photon flux density (PPFD) (mol.m-2.s-1) and time or irradiance (W.m-2) and time. The traditional functional unit used for assessing lightsources, 1x106 lm.h, is not appropriate for horticultural applications as the lumen is a quantity based on the response of the human eye over the range 380 to 780 nm. The new assessments are based not on the output of the lightsource nor the lightsource plus the luminaire and electronic control gear but on the irradiance and uniformity delivered by the lighting installation to a defined surface for 1000 h. A plane surface has been used because the actual irradiance experienced by the plant varies as the plant grows and new leaf formation promotes shade to other parts of the plant. This approach reflects the importance of the lighting design as well as the characteristics of the lightsource, gear and luminaire. It is widely accepted that uniformity is an important factor in lighting for horticulture and various designs can be used to illustrate the compromises between average irradiance and uniformity. Because the spectral power distribution over wavelengths from 280 to 1200 nm plays a vital role in the responses of plants to radiation we have defined functional units for several wavelength ranges. Metrics have been developed for UV-A (315 to 400 nm), PAR (400 to 700 nm) and far-red (700 to 780 nm). The principles defined in the Society of Light & Lighting’s ‘Code for Lighting’, i.e. the right amount of light, in the right place at the right time with the right lighting equipment, are shown to apply equally well to commercial greenhouses as to interior lighting.
Databáze: OpenAIRE
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