Commercial growers' height from canopy to light

When there is that much light in the room they dont need to be close. The closer they are to plants the more the plants stress.
 
When you have a lot of lights in a room the overlap means you can raise them higher and still get the same amount of light per square foot as less lights at a lower height. It's also because with so many lights you don't want to be moving them up and down all the time.
 
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