yea i dunno about any of that im on my first vgrow but i really love plants and am really into biology. i stretched my plants by having the light too far away from the plant. theyre already almost 2 feet tall. but yea one definite piece of advice if you have limited grow space is to keep the lights as close to the plant as you can without burning it that way it wont stretch too much and it will be short and bushy rather than tall and sparse. thats all i can think of.