@jsilence - the GrowPotBot is micro-scale but using relays it could control a much bigger system so a single unit could control a greenhouse or space-station. Just like a PC could control one light in your home or many.
For a space station i'd recommend having at least three of them and a quorum protocol to detect failures. (planned, but not in the MVP)
now let's get into "GrowPotBot is a toy which doesn't solve any problems" .... hmm, okay let's start by ignoring the urban food deserts in poverty stricten areas and focus on the "food that looks like food but isn't really nutritious due to it being harvested before it was ripe and then sat in a refrigerated storeroom or transport ship for a year before you got it" .. so that creates a MASSIVE carbon footprint between refrigeration and storage. it was also irradiated and chemically treated to destroy any bugs before it was allowed to move across borders.
Also -- at least in the land down under (where I am) in Australia we have the largest density per capita of hydroponic growers in the world and something curious happened because .... well, FUCK capitalism where a handful of growers cut costs and used nasty fertilizers and made 'unhealthy toxic hydro vegetables' or at least that is NOW what the public perception, so a lot of people want more control over what they eat and GrowPotBot delivers that.
i personally don't like getting my food from nameless industrial agriculture who is using who knows what pesticides, if you're cool with that then good on ya!
which brings me to respond to your last point that sunlight is somehow better. umm.. no. that's false.
i love sunlight; getting the vitamin D. but sunlight is only available in limited quantities during the daytime and plants can actually grow and grow and grow for 18-20 hours per day. plants actually do marginal photosynthesis in moonlight btw. plants evolved with the sun we have, so yeah -- of course sunlight works; but they're actually quite 'inefficient'
if you've got sunlight and can control heat WHILE keeping the pests and organisms (soil fungus) away then absolutely it's possible to design an enclosure which uses natural sunlight. the bigger it gets; the more difficult a proposition that is.
there's some fascinating research in this area; but suffice to say that frequency and intensity with a intelligent optical sensors in a closed feedback loop (positronic farming) is something "new" -- and "new" ag-tech is exceptionally rare. the thing is -- it's more computer/electronics than it is farming, and farmers like to rely on natural systems versus man-made systems which is why I'm skipping the farmers and going straight to the consumers.
now for the science:
plants use red 650nm-720nm & blue !420nm and reflect green light. red produces fruit "veg" and blue produces growth "blue" and again green is reflected. this is known, google "why leaves are green" and how chlorophyll operates to generate sugar and growth.
solar panels take in full spectrum photons regardless of frequency including x-ray, gamma rays, bla bla .. and newer [future] versions actually convert waste heat back into current -- this means that we're effectively able to take in full spectrum sunlight and change the frequency to something plants can use. i suspect we'll see clear solar panels / nano-films at some point.
GrowPotBot is using 12v LED fobs doped for specific frequencies which have very (absurdly) high efficiency rates and very low heat dumps compared to traditional grow rooms which often require massive cooling. so please don't compare us to those medieval monolithic architectures with giant high pressure sodium monsters. thanks!