Definitely don't want the lights doing the smoking!! Now, keep in mind, on my first TD, I had a few buds that were 6-8 inches, so the bud size can vary. Now, I truly believe that since I had so many more bud sites, the plant had to expend more energy on all those bud site, so they ended up being smaller. If that is how it really works, you should be fine. I just don't want you to think that the bud size is absolute, and it might vary. 10 inches should be sufficient, but make sure you can adjust if necessary
Yesssirrrr! Hoping to get that rainbow effect up in there!