I am starting the flowering period on my plant (first time grow) and i am using the energy savers i have read that you shoul have at least 2500 3000 lumens per sq/ft is this true, can i still use these lights during the flowering stage? also my plants are not as bountiful as i assumed they would be at this stage they are about 2 1/2 to 3 months old, i do not know the age as a friend gave them to me to take care of. Thanks in advance.