I don't see anywhere any mention of spectral efficiency. Can't find any reference number, but it seems plants grow the same under sunlight (say, 1000W/m2) as un

I don't see anywhere any mention of spectral efficiency. Can't find any reference number, but it seems plants grow the same under sunlight (say, 1000W/m2) as under LED lights that use only 250W/m2 or even less. When typical solar panel gets 160 W/m2 output then the comparison isn't so lopsided as you describe.