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Lets start with the auto, need more input, is it a 50-65 day, 90+, 120+, this is going to tell us what size your plant should get IF you can grow it to the breeders specks.
Here I'll be the second to answer it. Depend of what kind of "300W" light you are using....! Be a little bit more specific about you grow. You know, the type of strain you are growing etc..
Match the light to the canopy size by multiply sq. ft. by 30watts per sq.ft. if purchasing a full spectrum LED and growing photo period plants so a 4x4 needs about 480watts
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