- you can have a crop of fancy lettuce in 3 weeks with medium light intensity, simple flourescent tubes will do the trick for about one KWh per square yard per day- about 15$ to produce roughly 20 heads of ~gourmet lettuce retails about 3$ a head, or better if you have a restaurant and serve salads.

that being said, a big part of the problem is irrigation with liquified fecal waste that has not fallowed properly as a bare minimum

this just in ... a high school student can do this and it is regularly set up and maintained by said highschool students, all you need to remember as a core concept is P.L.AN.T. photosynthesis light atmosphere nutrition temperature. cannabis cultivators are not the brightest or most adept bunch but they seem to struggle through and make millions as the tax revenue would suggest