Glad to see that Padawan still realizes that the O.P. (me) is still here! I must admit; this thread has turned into T.M.I. (too much information), though I still find it informative. Here is what I've got so far:
1. The Diablo 200 is a killer unit, albeit, with some "controversy" over the dimmability. That is fixable or controllable, one way or another.
2. Replacing the driver (for the "correct" model) would solve the controversy - best choice!
I don't have a tent, I have a purpose built growbox. It is "modular" so I can add a section, or drop a section, and make it any height I want. I'm thinking 6 ft. (or 2 meters) should be enough. What is the current RIU Discount code for HLG, I like to save money? That very light you suggest was my 2nd choice overall, I just thought that the Diablo 200 had a little extra kick. Plus a little more "Red spectrum" light.