Do I still follow the instructions per light they are spaced out pretty evenly gaps on the walls and in between the lights.....just thinking does the light intensity go up because there are 2 side by side? Do I treat it like a 400w led In regards to hanging distance or still follow the instructions for each light? My plants have been growing good under 24" at 75% they are just flipped to 12/12 two days ago......I thought I noticed burning on the tips when they were down closer at 18" and 75% which is why I had them at 24". I just moved them down to about 16" at 75%
The proper method would be to measure the amount of light the plant is receiving. You can do this by using a simple phone app, or purchasing either a lux meter or quantum meter. I own a Dr.Lux meter and start my seeds at ~20,000 lux. I raise this to ~40,000 during late veg. I raise this amount even higher during flower. Otherwise, who knows ? All the lights are different so...