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In Canada, as in other higher latitudes, there is not enough natural light for production of many greenhouse commodities during the darker months of the year. In these regions, it is necessary for growers of year-round commodities to augment their naturally occurring lighting deficit with artificial lighting to meet their crops' economic minimum lighting requirements.
Until recently, the most economically viable supplemental lighting solution available to greenhouse growers has been high-pressure sodium (HPS) lamps. However, light-emitting diode (LED) technology has improved significantly in recent years and now offers the promise of providing greater energy efficiency and targeted wavelength light in long-lasting fixtures.
LED - Technologies - Intensity - Output - Time
Some horticultural LED technologies can dramatically modify intensity and spectral output in real time, increasing their potential to be used for photosynthetic, photomorphogenic, and photoperiodic applications.
Dave Llewellyn, Katherine Schiestel, and Youbin Zheng conducted a study at the University of Guelph to determine the degree to which these LED advancements could benefit greenhouses in the care and proliferation of plants during longer-term exposure to supplemental lighting and to investigate the potential for LED lighting technologies to replace conventional HPS lighting systems. The researchers investigated the production of here varieties of cut gerbera under either HPS or LED supplemental lighting at the same canopy-level intensities.
Conclusions - Article - Diodes - High-pressure
Their conclusions are detailed in the article "Light-emitting Diodes Can Replace High-pressure...
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