Thanks. I think they are near being ready to go 12/12 with the 250W HPS. I don't know what LST is. I am open to suggestions and advise.
LST = Low Stress Training. Basically you tie down your higher branches, I use duct tape and string with a coated paper clip, use the paper clip like a hook and then pull down and tape it to the container. That way if I need to move them around they are not tied to something else.
It helps with a more even canopy, I cropped mine and then started pulling down the faster growing branches, so each plant has 5 - 7 tops at the same level, then I have a few others here and there that are a few inches lower.
Depending on the strain and stretch it can help. I was unsure of my exact strain, so I just started pulling them down. Good thing too as mine stretched at least 12"+ after switching to 12/12 & HPS
I still have a bunch of lower growth, will ultimately decide what to do with it when the tops are ready. Might just cut the top 10 - 12" and leave the lower growth an extra week or so.