“This enormous indoor lettuce farm for example—the largest of its kind in the world—produces 10,000 heads a day in less space than a single American football field and could signal a sea change in how we get our greens. This 25,000 square foot (roughly half a football field) indoor farm actually used to be a Sony semiconductor plant in Japan’s Miyagi Prefecture. That is, until plant physiologist Shigeharu Shimamura set about converting it into the world’s largest indoor farm illuminated by LED. Using LED bulbs developed by GE, designed to produce the optimal wavelength of light that plants crave, Shimamura is able to accelerate plant growth by 250 percent.”
http://gizmodo.com/the-worlds-largest-led-hydroponic-farm-used-to-be-a-son-1603082545
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