I have noticed that the plants i topped the day before flower are not really growing. Five days later and they are still pissed. I hope that they just take longer to finish and that i did not screw the yield up too too much.
Sadly, I think you did mess it up a bit, never top when you can train, especially never top just before flowering .. IMO... as I said elsewhere recently, when you top a plant you remove all the growth hormones [auxins] and the plant has to make them again ... if you top it, they just flow evenly to the equally high parts of the plant. Likewise, train you plants to evenly fill the "holes" on the table, it is free yield.
I have decided to switch out the MH 400's for the 600 HPS. I am no longer worried about stretch as they have not stretched too much, and when they do i tie them down.
I had a late urge to try a scrog because the SS are so skinny on the branches. Then i did some research and decided i am a little late for that. Maybe next grow.
They should stretch less with MH as you say, probably look a bit nicer too.
I am using RO with 7.5 ml of calmag+ added. My PH is locked in at 6.0
I am fairly certain it is the proximity to the light because it is only on the leaves closest to the bulbs, and the rest of the plant is unaffected. I raised the lights a little and will see if that makes a difference.
Does anyone know if A 600W HPS can be to close to a canopy? IN terms of light intensity and NOT heat?
I have grown for 18 years in many different places without a drop of RO water, it is not needed it is a fad... IMO ... the last thing I would recommend to a newbie.
a 600HPS should be far enough not to burn, but not so far away as to give poor light and cause stretch. 18" to 2' away is fine, if it is too cose you often cause the tops to spaz out and go into a 3rd burst of flowering that finishes weeks after the rest of the crop.