While its for sure true that increasing Red increased yield, I wonder if the weed is more potent? From what Ive read, its said the spring crops of weed in California, are more potent than the crops in the fall. And they sell for more money. There was a program on PBS 30 years ago, when the Israelis did a study on flowers grown in greenhouses with the glass/Filon infused with red, and the red infused greenhouses had a much bigger flower vs the greenhouses that had no red infused. For 50 years Israel has been at the leading front of greenhouse horticulture. But bigger doesnt mean better.
Israel has seemingly put out the most studies on cannabis. I know of a handful of them and they're all interesting.
Israel started researching Cannabis in 1955,, the first country in the world to research Cannabis as a medicine and grow technics.