Father, I use T-5 HO fixtures in both greenhouses. I only use them in the fall and winter months, simply to augment the natural light. These are so intensely bright (and hot) that I had to continue to move them further and further away until they were no closer than 3' to my plants. I'm growing orchids, not plumeria. The regular T-5 are good light fixtures too though not nearly as powerful as the T-5 HO fixtures. Thus they can be positioned much closer and don't get nearly as hot as the HO. Oh, the T-5 fixtures are probably 1/2 to 1/3 as expensive as the HO fixtures.
I wrote two articles on light and lighting, the first on 1/13/14 and the second on 2/23/15. You might find them interesting and helpful.
