LED distance in grow 80x80x160

I will go out on a limb here and say that your 120w LED is barely sufficient to support veg at those distances. When it is time to flower, your ladies will need more power. If this were my tent, I would raise that bigger lady off the ground and try to get it closer to the light. However, without an accurate source to see what kind of PPFD numbers you are getting you will have to rely on the plants to tell you if they are getting enough light or not. This is not necessarily a bad thing. It is a good way to learn. We tried the Photone app on an old iPhone 7 and quickly realized that it was not accurate at all. We then purchased an Innoquest SpotOn quantum meter and were shocked at just how far off the Photone app was. Here is a video of our experience with it. www.youtube.com/watch