I have added a screen (made of 1" chicken wire and 1/2" PVC) above my tomato plants to create a canopy focused near my light. I am going to delicately weave the leaves of my tomato plants along the screen horizontally. I am trying to give the plants the maximum amount of light to their photosynthetic parts. Eventually I hope for the fruit to dangle below the screen for easy picking.
The carrots seem to benefit from this as well.