this id my first grow and ive been growing for 4 weeks indoors fromt seedling start and i use two 65 watt plant lights ans one 70 watt plant forecent light, can i use this for all stages and when can i start the flowering stage, i use the right nutes i know from reading so much but im still kinda iffy, right now there 8inches tall, i could use any advise i can get plz help thanks