Who was a postdoc in this lab-like a long time ago i forget 20 30 years ago now he's a distinguished professor at the University of Georgia we are still collaborating on this work and to tell you how the circles that we go in shu young got her PhD with mark van hemp cream for pain relief easel and she came here to do photosynthesis research here's the paper that summarized all this just published last year why far-red photons should be included in the definition of photosynthetic radiation this is a review paper but co-authored by all of us this is pretty in-depth?

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It's fascinating because i want to share the excitement of research with you this is a huge finding for all of biology look at what these colours do this is a leaf and we'll put the leaf in green on here here's the bottom of the leaf here's the top blue and red photons are quickly absorbed in the top of the leaf they're very efficiently absorbed but they don't penetrate they're so efficiently absorbed whereas the green photons penetrate deep into the leaf and when you get another leaf down here they keep going they keep penetrating into the canopy so green photons are the value of green is underrated look at far-red these also penetrate deep.

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The leaf this is one of the reasons that these photos are so good this let's get rid of that this is there are two papers you can pause this and see these papers but two papers on the value of these far-red photons for photosynthesis and far red's almost like a blow torch it's a real powerful wavelength that now we can now add and subtract when we do electric lights in greenhouses summary of spectral effects i'm taking a dozen lectures and compressing them into minutes this was helped out by paul Kazuma a recent PhD student in the lab he's now a research scientist at Wageningen University in the Netherlands/

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He helped us out a lot during his PhD year let's take these five categories of light and go through them uv induces photoprotective pigments in plants and some of those photoprotective pigments could be cannabinoids because they absorb hemp cream light uv light turns green lettuce red that's anthocyanin i will say that we don't have any evidence from multiple studies in this lab that more uv can trigger cannabinoid synthesis even though people think that it does and our results are now consistent with other labs on that blue inhibits cell expansion this is a if you want to keep plants small and short you can do it with blue and i think i have a picture here's cannabis thirty per cent blue five per cent blue look at that difference in height you can shrink the plants make them compact with a blue light when you do that you have to plant at a higher density but these are all trade-offs with manipulating the shaped green is key because it facilitates human vision here's some blue lights​