This is simply not feasible on a large scale. The water and light are free and 100% sustainable outdoors. Indoors? Heating, cooling, insect problems, light (produced by fossil fuels, and inefficiently at that). This will serve a niche market for fresh greens close to large cities where the rich can afford the price. Even figuring in the cost of transportation from the field, this looses out. https://www.youtube.com/watch?v=ISAKc9gpGjw