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The 15w Screw-In LED Lamp: What Is the Optimum Scrog Distance?

Douglas.Curtis

Autistic Diplomat in Training
Though I'm looking more toward best results with scrogged sativas, scrogging with 15W screw-in LED's is still experience I want to hear. I'm beginning to toy with designs for a low-watt, long flowering sativa cabinet. :)

What is the optimum distance to the screen, to prevent bud-tip light bleaching and quality decrease? How far away before the flowers at screen level have to grow stems, because they're reaching for the light?
 
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