I'll clarify that statement and expound upon it just a tiny bit.
For the most part that is true.
I think that for the same time frame you have the opportunity to grow more and higher quality of bud because with the longer light cycle, it is easier to hit the DLI with less powerful light, therefore you don't have to stress the plant near as much. You have a better chance of finishing with a plant in great condition. If you have very healthy girl that goes into natural senescence, you're gonna have a true expression of what is possible in the bud.
In the upcoming all AutoSeed run, I will be running supplemental CO2. While it is mainly to be assured of having plenty of CO2, I will use it in the 4X4 tent to be able to also run the under canopy lighting. In that tent I will be running the biggest girls. I do plan to run elevated ppfd from the main light until I start using the under canopy lighting. Hopefully this will get the girls large enough to be able to run the undercanopy lights in the fashion I envisioned. Once I start using the under canopy lights, I will back down the main light to a more normal ppfd. I plan to start using the under canopy lights about the first week after flower begins.
Hopefully with the large 15 gallon pots, the girls will have an extended vegetation time.
Hopefully if everything goes as planned, it will be a very nice harvest. That means I need to make sure I get the automated watering down pat. While I'll only have moisture monitoring on one pot, deep and shallow, I should be able to use it to be able to adjust the preset on the carrots by taking the shallow monitor and use it on the other pots. I'll be using the figures that Jeremy of BAS used in his past grow. As we all know, watering with autos is extremely key. I hope I'm able to pull it off.