I do the LST, but it seems the plats are realy bus...

Hi @bluetonic! Well, it's easy to over-do with LST, I think your worked a bit too much on these plants, give them some time to recover from your latest manipulations. Plus, you've just changed the lighting system, that's quite a disturbing event for plants so they will need a few days to adapt to the new light spectrum/power. At this stage I would stop to LST since it seems to slow down the growth, and considering you're growing an auto, time is running and she should start pre-flowering soon. Finally, your diary says your temp is 25°c, but your thermometer on picture 8 shows a 32.8°C temp. High temps can lead to slow growth and many kinds of issues. Combined with the previously listed factors, heat might be responsible for the lack of vertical growth. Now about defoliation, I won't do it now, not until the plants look healthy with a normal daily growth, otherwise you may add another stress and loose some days recovering from these shocks. Hope this will help, keep us up-to-date and happy growing 👊