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Really depends on your head room. A 400w light will penetrate a decent amount of the canopy. Start them around 12in if you have 4-5 feet of space. Also depends on the genetics. Some plants will stretch more than others.
-------------------- "I have always loved marijuana. It has been a source of joy and comfort to me for many years. And I still think of it as a basic staple in life, along with beer and ice and grapefruits - and millions of Americans agree with me." - HST
im growing a purple strain and i know they tend to stay smaller than alot of strains how many 12" plants would you bud under a 400?i bought more than i need so i could pick the strongest ones, i was thinking 6, and i have 1 plant that i had been veging under flourescents for quite a while that is about 15" tall and 17" inches wide that i wanted to put in with them. do you think i have enough light for that?