Authors: Benjamin Snow, William Lubitz, Syeda Tasnim, Thomas Graham, David Llewellyn, Fadi Al-Daoud
Download file: https://library.csbe-scgab.ca/docs/meetings/2021/CSBE21805.pdf
Published in: CSBE-SCGAB Technical Conferences » 5th CIGR and AGM Quebec City 2021 » Regular Sessions
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Description: Ontario greenhouse growers are moving towards year-round production supported by increasing use of supplemental lighting, and greenhouse light emissions are increasingly impacting neighboring residents and workplaces. Some municipalities have started to implement by-laws to limit light emissions, including in the Kingsville and Leamington area of Ontario, which hosts the highest concentration of greenhouse vegetable growers in Ontario. Current literature contains little information on the magnitude of light pollution produced by greenhouses, and effective light pollution abatement processes. In particular, there is little reporting of quantitative information on the intensity and spectrum (or colour) of night time light emissions from commercial greenhouses. This study sought to address this shortcoming by collecting a series of direct measurements of light emissions from multiple greenhouses in Ontario using drone overflights and ground-level measurements during the winter of 2020-2021. Laboratory tests were also conducted to independently measure the transmissivity of different curtain materials, including those intended specifically as blackout curtains to prevent light emissions, as well as common glazing materials. Visible spectrum cameras (DSLR and drone), a spectrophotometer and sky quality meters were used in concert to characterize the intensity and spectrum of light emissions from a range of greenhouses using LED and high pressure sodium (HPS) supplemental lighting at night. The effect of available blackout, shade and energy curtains are compared to base cases with lights operating but no curtains deployed. Measurements and analysis of the field and laboratory data are reported, and potential implications for greenhouse growers and municipal policymakers are discussed.
Conference name: 5th CIGR International Conference and CSBE-SCGAB AGM 2021, Quebec City,QC, 11-14 May 2021.
Session name: Plant Systems & Posteharvest Technology 3
Publication type: Presentation
Language 1: en
Rights: Canadian Society for Bioengineering