masshole61
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I have heard that UVB lighting can greatly improve weight and bud density late in flower. With this thought in mind, I'm building a 12x6 2000W room and am considering using 4foot UVB fluorescents hanging on either side of my air-cooled raptors. Can anyone explain the benefits of UVB lighting in flower, how much lighting is necessary to be beneficial and when to use the UVB lighting ( during veg, throughout flower or at the end of flower)?