EYE HORTILUX™ lamps provide light to an underground hydroponic farm.
A bank vault in the basement of Pasona O2 in Tokyo's Otemachi financial district has been converted into a flourishing farm.
Pasona, a personnel company, created the underground vegetable fields to provide agricultural training to a new generation. This urban farm is maintained using computer-controlled artificial light and temperature management. In the absence of sunlight, the plants are sustained by artificial light from light-emitting diodes, metal halide lamps, and high-pressure sodium vapor lamps.
The temperature of the room is controlled by computer, and the vegetables are grown by a pesticide-free method in which fertilizer and carbon dioxide are delivered by spraying.
Hydroponics, in which plants are grown in water and hardly any soil is used, is one of the methods of cultivation used in the facility. The "field" has an area of about 1,000 square meters. Tomatoes, lettuces, strawberries, and other fruits and vegetables are grown, as well as flowers and herbs. There is also a terraced paddy field used to grow rice.