MJ420

It could be the temp and humidity that you mention on the journal but I've had plants in Rambo conditions and turned out to be monsters so might be something else. Looking at your setup and based on the info in the diary the only thing that jumps to sight is the lights. Might be getting it wrong but that's a 400w led right? It says 1000W in the description but that's not real I think. Besides the spectrum is not that enhanced. Thing is that 400w they announce has half the efficiency of the 300w TS2000 for example. Noticed that when growing with 100w or 200W so devices like those leds (older tech) plants don't grow at full capacity. The light coverage is not that great and it looses lots of efficiency when you grow your plants more vertically (if you keep your plant short and horizontal it will work better). You can still make it work with those lights just need a few tweaks like training well your plants. I've gotten way better results with cmh 315w which are mid range value (got light by 65€ with magnetic ballast - results in 400g/m2 +/-). If you really a led guy and love Mars Hydro the TS2000 give very good results but I still get by better with CMH 315W 4200K. Keep in mind all other factors mentioned by Robert. Good grows friend.

There is many growth factors in play. My plants take longer, but get way bigger, especially my autos. Strain and phenom of the strain can matter. Light. Humidity, temperature, substrate, ph the list is pretty extensive really. Growing in a science and a art at same time. Hopefully this provides some insight. Happy growing 🌱

I have the same issue.mine is high temp and humidity and also my tent is like a mild vaccume with carbon filter which can effect growth rate.