ok so finally i found some time to write here
in my own searching about UV-radiation ( while searching i found this thread here ) and its impacts on plant growth i tried to solve it from a different end. i was thinking about the fact that if UV-radiation has any influence then it has to be absorbed.
i alrdy knew that for example chlorophyll a and b got their absorbtion peaks in red and blue and thats the reason why lights using red and blue spectrums end up with a purple.
the proof that this works best did Theodor Wilhelm Engelmann when he measured the effects of different colors of light on photosynthetic activity. the results where that the most photosynthetic activity was seen at the colors of light that match the peak absorbtion.
so i looked up some other absorbtion spectrums:
carotene
peridinin
so what you can see there is always an amount of UV-radiation that is absorbed. sadly these grafics i found dont got further down the wavelength.
i found one grafic that goes further down for carotene:
as you can see there is even an absorbtion peak at about 285nm.
so i was sure that if you can control the amount of UV-radiation to a level where it helps more than it destroys then you would have a wavelength that also pushes some photosynthetic activity out of a plant. i would assume there is a factor between the absorbtion percentage and the radiation power that would be best at certain wavelength.
maybe this would not be such a big difference as if u would grow a plant only with blue light and then found out "hey there is red that helps my plant also, lets hang some red lights", but there has to be a positive impact in whatever way. photosynthetic activity cant be enough for the cannabis growers right?
so i tried to find more information, i found that 2 researches and after that i found a link to RIU haha. everything i read here just told me i was right in a way
so now i am here and shared my findings i hope they help. if i am wrong please tell me cause i love to learn things from the pros.