The vibrant hues of hot pink and canary stand out so much that astronauts can capture them from space. Positioned above the largest cluster of greenhouses in North America, these colorful lights have not only illuminated the night sky in a section of southwestern Ontario but have also revolutionized the multi-billion-dollar agriculture industry in the province.
In the past ten years, both vegetable and cannabis growers have integrated thousands of lights inside greenhouses in Leamington and Kingsville, Ontario, to facilitate year-round plant growth. However, the luminous glow from the southernmost region of Canada, visible even from Michigan at times, has sparked both admiration and unease. This has led local communities to establish regulations limiting the brightness of the greenhouses after sunset.
Richard Lee, the executive director of the Ontario Greenhouse Vegetable Growers, representing 170 members mostly in Essex County, acknowledged the challenge of adapting to the rapid technological advancements and addressing concerns raised by the community regarding the greenhouse lights.
Despite the implementation of rules to minimize light pollution, the radiant glow remains visible from various parts of the region and even from the International Space Station. Starr Livingstone, the light pollution abatement officer for the Royal Astronomical Society of Canada’s Windsor chapter, emphasized the impact of the greenhouse glare on their observatory, although improvements have been made over time.
The surge in greenhouse construction in Kingsville and Leamington, as illustrated in recent satellite images by NASA, reflects the significant growth in the sector since 2015. This expansion can be attributed to factors such as the legalization of marijuana in Canada and the adoption of lighting technology for year-round plant cultivation.
John Norton, the chief administrative officer for the Town of Kingsville, highlighted the advantages of using grow lights to enhance crop yields and profitability for growers. The demand for fresh produce, particularly during the disruptions caused by COVID-19, has further fueled the growth of commercial greenhouses in the region.
While the rapid adoption of grow light technology has boosted agricultural productivity, it has also raised ecological concerns due to the region’s unique ecosystems and wildlife. Consequently, both Kingsville and Leamington have enacted bylaws in recent years to address the escalating light pollution from the greenhouses.
The regulations in Leamington require growers to install light-blocking curtains and restrict light emissions during specific hours, while Kingsville has adopted a stricter approach prohibiting any curtain gaps. Enforcement efforts have been intensified to ensure compliance with the bylaws, with measures taken to lessen the environmental impact of greenhouse lighting.
Overall, the balance between economic benefits and environmental considerations remains a challenge for the greenhouse industry, necessitating ongoing efforts to mitigate light pollution while sustaining agricultural growth in the region.