Now, for super tight nodes you have to take advantage of a few things.
1- Feliz 6500k T5's have peaks at 435nm & 615nm. Plant photosynthesis peaks @ 435nm & 680nm. Also, T5's produce MORE ROOT zone mass than ANY OTHER LIGHT SOURCE currently available to the consumer.
2- I use Liquid Light and Saturator for Foliar feeding. This is from DM.
"Gold Range LIQUID LIGHT puts your plants into overdrive by helping to restore their lost natural photosynthetic power. Liquid Light does this by providing your plants with selected minerals, carbohydrates, amino-acids and phyto-nutrients that optimizes the Calvin Cycle, a critical cycle of photosynthesis. By restoring a large portion of a plants’ natural genetic photosynthetic speed, or power, plants are able to use a lot more of the precious light you provide them."
So AGAIN, I am OPTIMIZING the Calvin cycle, thats twice now, once with a T5 and once with LL.
3- I have VERY low humidity in my veg room. This goes against some principals of growing however when you remove humidity plants adjust by making their leaves thicker for gluttation and transpiration purposes. SO when my plants go into flowering they have massive amounts of stored nutes in them to start distributing to flowering asap.
So, when you combine all those factors, and I have the pics to prove every word I speak, you know this, when you put them all together, your plants actually has no need to grow tall what so ever. Hence toe nodes being almost stacked on top of each other in all my plants. Once they hit the HPS chamber where the light is high above them, they will stretch out from the top down to the bottom first, and thats when I top them the last time forcing the lower branches to push out and then using the reserve nutes stored in them to heal the plant. As it heals and transpiration takes place the plant is refueling with my flowering nutes, it is also still getting LL for the first three weeks of flowering which cuts healing time to about half.
Hope this helps on your next batch, as always, open for questions from the thread owner.