N can be like 10 or a little less. There is no point in culturing lettuce indoors because is a product too cheap that is up to 96% water. Counterintuitively, 1

N can be like 10 or a little less. There is no point in culturing lettuce indoors because is a product too cheap that is up to 96% water. Counterintuitively, 1 L of mineral water can cost more than 1 Kg of lettuce, so the winning move would be using the energy to purify the water, and then just to sell mineral water bottles. Lettuce as many other vegetables is just a form of water that requires you to wash it, before drinking. Indoor farming is for fungus, not for vegetables. Vegetables have too much enemies and without predators (or a strict, strict, blockage to keep all parasites out) is too unstable. And if you work for big supermarkets you will need to fight for each cent, or the margin benefit will be progressively reduced until they own you.