Magnum Auto 3X MSNL COCO+COB

Their final state is promising. frankly, I was scared that the first 3 weeks were spent with little light, they are fine for now. Due to the distance to the room, I went into basic flower food a little late. I apply the AN Master grower table. Of course, PPM values ​​are high. I dilute the solution with cal-mag to maintain the NER values ​​and not exceed the PPM levels. My only problem is the distance between the light and the plant. The COB LED is 70 cm high. There is 35 cm between the ceiling and the ceiling. There are 4 weeks in front of us. I use reflectors and lenses. Frankly I am undecided about how many cm to stop?