This is a 45 minute video from a professor at the University of Utah. It's a great video on the amount of light that cannabis needs and how it affects the needs of every other component of growth. I love science.
Saw this a while back. He's kinda goofy. Toked a bit. But it's great advice. I've watched others by him.
He's got one video that explains how you would need 5 acres of solar panels for every 1 acre of indoor grow space. I think the summation was it was not cost effective.