I believe it all comes down to providing the proper spectrum as well as the power to penetrate the distance necessary for a growing plant. I don't know much about these except that they don't penetrate space very far so, they might be good for 18" plants but not for 4 footers.
Now, if one were to build an entire cabinet with all walls and ceiling completely filled with these lights, allowing the ceiling to be raised as the plant grows, they might be used for larger plants.
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