I've read this a lot on this website and in the forum that the time to switch from veg to flower is when your plants have reached about half the available height in the tent as they will double during this phase. I followed that advice and after 8 weeks of veg my plants were close to half the avalable height and I cut the light to 12/12. My plants continued to grow and gained about 4" of height and then stopped growing. I don't know what the strain is. I'm at almost 8 weeks of flower now, I don't have any problems, they are healthy and should be ready to harvest very soon but what might the reason be for the lack of growth. My own thoughts are that maybe the pot is too small (about 1 gallon), as it's winter I struggle to keep the temp over 22C, maybe the 600W LED isn't enough.