When you see preflowers starting to appear it should be apparent within a couple days at most that they are either male or female.
You definitely want to go with a redder light for flowering.
stinkyattic Reviewed by stinkyattic on . 2 questions how long can you usually tell sex after the preflowers first begin to appear? how much better are the redish CFLs for flowering compared to the blueish ones? Thanks Rating: 5