How close do you have your lamp from the top of the plants.
For a 400 watt it looks like they not getting the max amount of light.
You can keep the lamps as close as 40 cm but not much lower.
600 watt = 60cm.
These distances have always workt for me!
There is also a app in the google play store called : hydroponic light tester.
It might come handy in determining the best distance to hang the lamp!!
Greetings from The Netherlands.
Have a nice day!!
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