I've used this approach as well. After much tinkering over the years, I have learned that it is very much possible to use the spectrum to control growth patterns. In this case, I'd like the plant to remain somewhat short. So I'll force it to begin its life with a 'Blue' lean in the spectrum. Aside from sunrise and sunset settings... Around day seven, I will begin incorporating 'red', on a slow daily increase unily 50/50 is acheived at around day 30. And at that point blue will begin a slow decrease until red leans 75% and blue 25%. At the same time, beginning at day 30, I will add a dose of UV for 2 hours everyday starting an hour before noon until slowly backing it down 2 weeks prior to harvest. It may sound complicated, but with the ParfactWorks Rj11, it's simple.Starting seedlings I try to have a balanced spectrum, 30% blues, 70% 3000k/reds.