What went wrong, thats what has me never switch over yet, did u understand about dli and ppfd when u first got ya migro
The first mistake was not buying one of his Spot on Par meters they are expensive but well worth it. I use it all of the time for seedlings clones and as the plants stretch.
I have the older type lights with brackets 1500w over a 5’ x10’ grow footprint. I keep the par at around 1,000 at canopy level. I try to keep the lights on full and adjust it by moving the light up but sometimes need to turn it down. Remember the higher the light the bigger the footprint.
My co2 is a homemade job so I have to manually turn the gas on and off. I still vent out through a filter with fans on very low. It sits at around 900ppm. If I wasn’t running co2 I wouldn’t go over 700 par.
I have also been sticking to the VPD chart best I can and I think it makes a big difference around 29 degrees and 75 humidity in full flower.
If you are not running co2 I would keep the lights 24 inches from the canopy but that’s just a guesstimate.