I find it very practical. The best solar panels are 40% efficient, they are very very expensive today but it is a real possibility that someone someway could ge

I find it very practical. The best solar panels are 40% efficient, they are very very expensive today but it is a real possibility that someone someway could get this level of efficiency in the future cheaply. You get over 1000W/m2 of sun radiation so you could get over 400W/m2. probably it does not look like much but given that plants are 1% efficient, and most radiation escapes earth it really is. You could absorb sun's energy and then use that energy to grow plants!! in a much more efficient way(inside buildings, under the surface).