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Supplemental lighting can enhance yield when sunlight is limited, as in winter. As the effect
of frequent cloudy or rainy days in other seasons on plant growth and yield remains unclear,
As indoor horticulture gathers momentum, electric (also termed artificial) lighting systems with the ability to generate specific and tunable wavelengths have been developed and applied.
U.S. urban land increased from 2.6% (57.9 million acres) in 2000 to 3.0% (68.0 million acres) in 2010. States with the greatest amount of urban growth were in the South/Southeast (TX, FL, NC, GA and SC).