Magnus, that's pretty much exactly what I was looking for, as far as math goes! Maybe I'm just weird but I like knowing even a vague pass of the science behind things. Thank you!
Naoki, that first fixture (diamond plate one) is the one I ended up getting.
The reflector is reasonably nice but I think I'll probably at some point trying to build some bigger ones to trap the light more. It's way brighter than everything else in the general vicinity, haha. Thank you!
I think I'll see how this fixture works out. Assuming everything stays looking healthy, I'll leave it as is. If not I'll add or remove light as needed. Currently working on adjusting the height of the rack and lamp since I went out to buy rocks for my humidity trays and came home with an oncidium that's like 3" taller than I had it set. But that's a whole different thread I get to make later.
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