i finished reading dj short's book last night and it was way better than the bog and soma books. some of the most valuable info i saw from short is the angle of light and amount of light that he uses in flower and veg. the traditional 18/6 and 12/12 are more of a flowering time and bring out more indica traits. when doin like a 13/11 and 11/13(tweek it out depending on strain) will give more sativa traits and so on.

on next is the breeders bible