How far should a 600w hps be away from the plants for optimum growth....i have it about 12in from the tallest and maybe 20in. from the smaller ones? is that ok or should i move the light closer? also...what is the area that one 600w can cover? i only have one 600w with 6 under them and i was...
i have a couple yellow leaves on the top of my plant....they are about a onth in veg and in foxfarm soil. temp satys at about 80 and humidity at about 70. its only 2 of the top leaves which are yellow...the rest look good. why are they yellow? any ideas to fix the problem?
