I've thought of the only efficient way, I think...
Besides water cooling both the LEDs and driver with super efficient copper blocks, and pumping to small radiator\fan at the base of each plant. So that it blows nearly all the extracted heat back up into well trained umbrella like canopies, that is..
So check it out:
..
Each LED grow light fixture has a small built in go pro style camera, right in the center and facing down. So from there, basically in real time.. it projection maps out the leaf movements it senses, and creates a somewhat 3D virtual map of the entire plant from above. At all times, no matter how it grows. As long as the air circulation fans are running, and the leafs are slightly moving (and green, it senses that too), the advanced AI software analyzes that data and then controls a powerful fast moving IR laser beam, that scans only the mapped out plants in the area leaf by leaf, so fast (like, 100s of times per second!) you don't even know its happening, or see the beam coming out of the projector. It would be just the right frequency too, that it doesn't burn the leaves, or focus on any spot for too long. Just helps to mimic the intense heat of the sun rays, which you can tune with different settings to achieve the perfect VPD every time during lights on. All while using way less electricity than using any other kind of heater to supplement with.
Haha JK, HID is king!