- Have you experienced this issue with this same flowering tent light and other strains/grows?
- Temp/humidity levels?
- How often do you water? And how much?
Gaia Green products are very light, so I doubt the issue here is toxicity. My first thoughts upon viewing the photos are either 1) excessive watering or 2) low humidity.
Humidity issues are my guess, not really seeing any "phantom" deficiencies/toxicities that would point to pH/over watering.
It looks like what's happening here is the low RH% combined with your HID lights (LED are VERY much high intensity) is causing a "vacuum" (or VPD) and the low RH%+light is causing the water to literally be sucked from both your pots and plants themselves.
I had this problem when I grew under my DE bulbs (almost as powerful as quality LEDs). Anytime my RH dropped below 50% my plants would suffer and looked very similar to yours. When I got the humidity back to 50-60% the plants perked right up.
DE and LED lights have a wider spectrum, as we all already know. As a result of this, the plants have more usable light. More usable light = more photosynthesis.
I ran 50-60% RH all throughout flower; you'll never see mold if you're sanitizing your room, keeping things sterile, and providing sufficient airflow. If you get mold/mildew from high RH then your airflow isn't up to snuff.
Lights can definitely be moved up a tad as well. Hopefully that LED has a dimmer feature of some sort too.
My plants loved every watt from my 1000w DE HPS right up until week 6 of flower. Until week 6, the plants could not get close enough to the light and it somehow did not cause burn. Week 6 came and they started suffering. It wasn't until week 8 that I thought to dim the light down to 600w, but by then it was too late and I'd already lost yield. Buds would have been a lot more flavorful and fatter if I dimmed lights at week 6.
Sounds counterintuitive to back off light during the last few weeks of the plant's life cycle, but consider how it works outdoors. Sunlight is very intense and lasts for 14, almost 15 hours until summer happens. Then, not only does the light cycle get reduced, but so too does the intensity of the sun.
Hope that helps in some way.
