I really cant tell you exactly what i did, but in main stem wise, I did see a big increase in thickness after switching to a 400w system from (12 CFL's 26w each).

Hope that helps :jointsmile:
superskunk1 Reviewed by superskunk1 on . main stem diameters I know there are lots of variables that come into play, but i started with seeds str8 from a street bag, so no idea of strain. 3 plants in dwc using gh3 vegged for 5weeks under 70w hps and 8 48" flourescent 40watts up opposite sides(4 each side). They look better than either of my last 2 attempts but are only about 10" tall, bushy as heck and more roots than plant. I am assuming so far this is a good thing. The tripp is the main stems are almost as big as my pinky finger, ranging from 3/8" to Rating: 5