I gather one can grow plants indoors with a sun lamp and hydroponics basins.

One places a sun lamp outside near some crops, perhaps only turning it on at night. Sun lamps cause short circuits if soaked by rain, so let's say one built a small roofed area supported by pillars, so light was able to get out to the crops.

One roofed over an area of outdoor rich soil, creating a room, and then putting a sun lamp in there.

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