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Actually, you want them close to the plants, since the amount of light greatly decreases as you move them back, even more than other lights. As far as a more focused beam, you can find LED's in 15 to 180 degree beams. Maybe even more by now I don't know. Some are more focused, some aren't. You are going to need to encase a plant in LED arrays to get any kind of decent yield. I'm thinking close and wide beams, not far and narrow beams.
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