A second horizontal trellis net or frame installed above the first trellis during the stretch phase of flower to catch the canopy as it grows through the lower net and control height relative to the light.
Jeremy installs the second layer on day 8 of flower in quadrant one using pre-cut PVC about 14 inches taller than the first layer. He stresses the exact height is arbitrary because the real purpose is keeping the canopy at the right distance from the light.
Discussed in: Ep 022