[Joof]

Nobody seems to be pointing out that it is unlikely to be cost efficient as well (sun is free), which is what matters.

[vectorjohn]

Sun is not free. Sun requires land. If (and I don't think we're there yet) you can get to where the sun gathered by PV can be used to grow more plants than direct sunlight, and you're in a space constrained place like Japan, it starts to make sense.

I mean, you can stack farms vertically if artificial light is economical. You can't stack sun-lit farms vertically.