The only argument I can see for an LED is heat... like Pit said, grams per watt is grams per watt. Don't matter what the watt costs, cause you're spending it either way.
For grams per watt efficiency, you're not going to beat a 600 HPS on a mover.
I mean it in the nicest possible way, but the LED start to finish plants on this thread look kinda weak, especially when compared to HPS grows.
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