This info is spot on. This is what we did before we got the light meter. Worked well for us! Great info Ween!Hi camper. I'm a noob too but what I've read here is to keep the light as close as possible without burning them. You could probably go as close as 8-12 inches...? Hold your hand where the plants are and if it's too hot for your hand then it's too hot for the plants. Check them often and move light up as needed. I'll be watching and am interested in the auto's, might be my next grow.