2) This is incorrect. Plants are not efficient, photosynthesis needs only a tiny part of the spectrum. Just he numbers, the efficiency of photosynthesis is 3-6%

2) This is incorrect. Plants are not efficient, photosynthesis needs only a tiny part of the spectrum. Just he numbers, the efficiency of photosynthesis is 3-6% while the majority of the solar cells have around 16% efficiency or even higher. Hence it makes absolutely sense to cover everything with panels and use leds to produce the exact amount needed.