It depends on how the parent genetics evolved to an extent as well. Different plants have different strategies for coping with VPD stress, both high and low. So let’s say you take a landrace from Nepal and a land race from Mexico and stick them under the same LED light source in the same grow space. I guarantee as you take the VPD up and down in that space that the leaf surface temperatures of the two plants under the exact same conditions will vary by a minimum of a half a degree at most values and respond differently.
Put them under HPS lights and they will probably vary even more dramatically as plants have to adapt their conductance capacities to climates with very different UV and IR exposure.
Under LED’s and in the absence of IR, the plants have a pressure variable that the plants weirdly don’t have to respond to. It’s odd.
But to the former, I’m quite sure that’s why studies are inconclusive with respect to how supplemental UV lights do or don’t cause an increase in “quality.” I’d venture to guess that a landrace that is exposed to lower levels of UV in its natural habitat would be the one that increases in trichomes/terpenes because it would be a stress response. A landrace that is used to higher UV probably doesn’t give a shit if you hit em’ with it.
All of these variables are fascinating and, in my estimation they are precious. The endless meddling with genetics destroys the quality of marijuana on an essential level. On the quantitative level not so much. I’m not talking about lab studies of molecule percentages. Do you pine for the newest sativa cross with the highest THC ever recorded by man or do you want the fucking real Neville’s Haze? Quantity is related to substance. Quality is related to essence. Lab technicians measure substance where essence will always escape him as he has at best an inkling of its existence.
Take some peyote in Mexico. Now take some San Pedro in Peru. Your experience will be very, very different. Yet, the measurable substance that we are told causes our experience is mescaline. The unquantifiable essence is the meat and potatoes of whatever trip you’d take..
Wait what? Where am I? Oh yeah, leaf surface temperatures