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I came across this article when researching lights to use during the lights off period of flowering because I wanted to water my girls when I get home from work but the tent will be dark. I found the blue light info intriguing. Ed says that blue light during dark periods can increase yields. Anyone tried this? I have heard Ed is a master grower.
Ed Rosenthal
http://mjgrowers.com/book_what_exper1.htm
Ed Rosenthal
http://mjgrowers.com/book_what_exper1.htm