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Thank you for catching my mistake. It's fixed now.

Grow lights are perfectly suitable replacement for natural light in areas where it's not available.

How is growing local food that has a large production potential on a very small area, without a large water footprint, not a smart idea? Just take a look at how much energy (and chemicals) it takes to produce our food with conventional farming techniques and you won't worry too much about the energy used by a few grow lamps. Even if this project only feeds a small percentage of passengers it's symbolic of a new food future in cities.