this week was stressful trying to top shrieker a second time and arranging the room for better light spread and throwing the trellis on top. I'm getting closer every day and I haven't had a single nutrient burn yet. I'm proud of that even though I'm not using chemicals. also I found a mushroom growing and that made my week. the mushroom tells me I'm doing it right
If your plants are already at 18in you should switch soon if in a tent. This is because plants will double to triple in size once switched to flower and you need to maintain a certain distance between your lights and your canopy.