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i have fifteen plants started form seed. two week ago ago i was able to sex two females. the rest have yet to show signs. how much longer shoud i wait. or should i count of them being males. today is day 52 from seed.

I want to build my own LED lamps? But I have a tons of questions as I am a beginner. What color/frequency LEDs are effective and in what ratio? Any ideas, build tips, tutorials, pictures, and experience would be greatly appreciated. Thanks for your help.