🇩🇪1,3ftx1,3ft Minigrow

Encouraging stretch isn't something I'd typically recommend for an indoor grow. First off, your plant is gonna stretch plenty in flower most likely, some plants can double or even triple in size. Second, space is an important commodity indoors and stretch is just bare stem, aka wasted space probably. Lastly, your grow light has powerful light but the further away stuff is from it the weaker the light- so by encouraging the plant to get tall you ensure less of your plant is in the optimal zone of light.

The maxim DLU I would hit is 40. anything over that requires CO2 and some locked in environmentals. If you want them to strech more, red lights helps with that and less intense light. Plus some strains don't stretch a lot. Could aim for a DLI of 30-35, and back it off so it stretches up if it will. age is a factor. I'd stop nuking them with the 65DLI asap. Good Luck!