Good spot to share 315w info. Been running 2 of them perpetual for close to 2 years now. They rock watt-for-watt against hps, typically about 25% more weight, and quality is better than hps imo. My son was a die hard hps grower until he saw what I was getting with these Sun Systems LEC's. We converted his grow watt-for-watt with these LEC's and he's been consistently pulling 25-30% more weight and is very happy with the quality. He just bought another 10 units for his expansion, no going back to hps for him if that tells you anything. I just swapped out one of the units to see how 3590 COBs stack against the LEC's but the LEC's aren't going away, will likely run a combo of COBs/LEC through summer and LEC's through the winter.
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Cheers