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    Can any pros here help me figure ppfd specs on my huge 42 chip 3590 array?

    Hey guys. I'm pretty new here. I see lots of posts here about figuring the exact specs on many COB lights as far as efficiency, par watts and ppfd. Heres the deal. First I build a "small" 25 chip array in my 4.5'X4.5' room. Now after the amazing results I get with it I built a second array and...
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