My garden is powered by a 150 watts high pressure sodium light gutted from a Security light. It works very well, last I heard of Led technology was from years ago, its very nice to see it going into such high production and applications. I have four month old big herb plants ready for outside, I had to take down my 3 foot brandywine tomato plant because it was just to damn big !

Indoor garden = FTW !

That statistic about people owning their own homes includes people who own condos, lofts, and yard-less houses downtown, which is a large number of people. I don't know how many exactly. Don't assume that that figure is mostly suburbanites.

If I were to spend 30min a day tending my 10 square meters of available indoor garden space, It would have to produce $1800 worth of vegetables per year to be worth the time. I doubt one can produce $180 per year per square meter without growing contraband. Also, the electricity cost of the growing lights would be over a hundred dollars per year for sure. If it were viable to produce most vegetables indoors at a lower cost than producing them outdoors, then large corporations would already be saturating that niche.

Also, with each additional variety comes the overhead cost of figuring out how to best take care of it. There is no way that it would be efficient to grow a plant that I would only use once or twice per year.