Yeah I have also read that (I cant remember the exact wavelengths) blue and UVB work similarly in conjunction like red and far red (Emerson effect) that results in increase in terps and flavoniods. Most of use already have enough blue and lack the UVB. Atleast under LED.Im going to guess here but based on a few facts. I think the defoliation wont matter as the trichomes are a direct response to the light. Sunscreen is a word used to describe them. And the frostiest plants grow on the side of a mountain in the desert rather than in a dense rain forest so makes sense.
Solis tech had tests on the 10k finishing bulb where the thc increase was the same running the uv strong bulb only the last two weeks as when they ran it full cycle.
so i guess the buds alone can produce the trichomes fine in response to the uvb because the plants were flushed and fading the last two weeks in the test.
Om sorry i dont have the old link. Its from a couple phones ago. But i did a ton of research on this stuff. I also decided not to bother as the thc increase alone does nothing for a quality high imo and i dont have product tested. If i still did it could make more money at the dispensary cause of the higher thc.