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What do you guys think of vertical farming?
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There's an organic produce company in Manhattan that uses vertical grow chambers and they get around the lighting problem by illuminating from the center of the cluster and rotating the plant pods occasionally.
They get around energy usage by charging a premium and taking advantage of state agricultural grants.
It's expensive but you can get city grown butter lettuce year round.
Normally that would be a bit of an heresy, but fun thing: with the good LEDs at the good frequency, you can make a solar panel + LED setup that is actually efficient enough to provide more light to the plant than it would normally receive.