Thats why we have a lot of stuff to do and to find out! NIR, IR, near UVA, Violet-Deepblue.... who does know a shit? Nobody.
Thnx, man. Yeah, i know. Reading all the marketing collateral from these grow lamps providers, they all come across like they think they know everything, and know exactly what they're talking about, and as you and i both know (being an engineer and hobby botanist and into physics), they aint coming anywhere close to imitating what the sun produces. (side note, and i hate these pocket energies when using LED's, thereby leaving gaping holes in the spectrum], but then lamps are so inefficient through heat waste, so what you're doing in building your own is the only way to go.
And as you also pointed out regarding where these plants originate from, the full sun is blazing down on them continually, where even I, (where i live up North and growing outdoors), do not even come close to the amount of sun that the plant is accustomed to. my only other option then is tenting, and i do not want to get into that at the moment, as i'm renting now, and don't want to created any havoc with the landlord. outside, he can't say much, as it's legal here in Kanada (note the German spelling.
), but inside, where there's a possibility of electrical/fire issues, plus the smell permeating the entire house and walls (which would therefor increase my cost with venting in order to deal with that), he would be pissed and can possibly evict me. It's just not worth the bother at the present.
UVA is also interesting, as as you say it produces healing effects for the plant - good research <two thumbs up> - overlooked by the light manufacture experts, eh?
but as you notice from looking at the sun's spectrum, the amount of UVA intensity at that level is very small, and nowhere close to the intensity of the PAR levels, however, UVA sits at the higher end of the light frequency spectrum, which means there is more "total energy" available (think x- or gamma rays), so when normalized, from the plant's perspective, the low UVA intensity level may be just as significant. therefore, I suspect that the lamps output would have to be closely mirrored (or mimic'd) with the sun's level, in terms of net UVA energy that the plant is receiving. I don't think you can just buy a UVA lamp, and then blast the F out of the plant and expect not to do any damage, but i could be totally wrong here, as i have no experimental experience.
I envy you in what you're doing - Kudos! would love to be doing the same if i had the time, money and place to do this. Keep us posted.
Us Germans just love analyzing everything to death for maximum efficiency.
lmao