Sorry; I meant "potentially more efficient". Anything relating to vertical farming is decades away from being commercially viable on a large scale; so it's not

Sorry; I meant "potentially more efficient". Anything relating to vertical farming is decades away from being commercially viable on a large scale; so it's not a crazy assumption that the efficiency of all those systems will be greatly improved by then. Regardless, most plants utilize only a small part of the light spectrum. Photovoltaics can capture a much, much larger spectrum and convert it to electricity. They don't need to be 100% efficient; just efficient enough that they can deliver all the parts of the spectrum that plants use without any of the parts they don't.