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Artificial illumination is used in northern Europe and Canada to supplement total daily light in winter due to the significantly lower light intensity and shorter day length compared to mid-summer. In these regions, supplementary light can improve yield and product quality, allow for year-round production, and enable day-length control for flowering. Thus, apart from facilitation of day-length control, supplementary lighting systems are not a wise-choice in terms of energy-use as well as economically, in regions receiving high intensity of sun radiation.
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