What's stressing my plant? Heat or not enough water? Too much light?

[THC123]

It could be your light, I ave had a similar problem under my fluence. Droopy plants, like they were overwatered, stunted growth. 2 weeks under the sun saved them.

But yeah, this is a big problem with these white LED's. I think its the spectrum. I can start seeds under a Blurple LED, HPS, Mh and the sun at full power without any issue whatsoever. But under these white LED's even with normal par values, i get issues.

I have now taken down my fluence and replaced it with 4 old blurple leds I had and the plants are super healthy again. For months i refused to believe the light was the issue. But in the end, it was the light causing all these problems.

 

[Strongstyleking]

The plants moved to the windowsill have greatly improved while the ones in the tent get worse. Not noticing any more black spots but I'm getting a USB scope to check them out to be sure, need that tool anyway.

I put insect netting on the plants in the tent under the LEDs and noticed improvement. Will dim LEDs and see if plants in the tent improve. If I can rule out disease in the isolated plants and they improve I'll put them back under LEDs provided I get the plants already in there back into wack.

 

[Strongstyleking]

You've gone from small pots into a 30L(8gallon) pot? with no re-potting. I go from a 500ML pot to a 20L pot

I was imprecise, I meant I transplanted into 8 separate 1 gallon bag pots not 8 gallon pots.

 

[Strongstyleking]

Plants doing much better after being moved to T5s for a bit. No signs of disease spread do put the plants under LEDs in the primary tent. Still seeing signs of what looks like calcium lockout in the lower leaves but things looking like they are stabilizing.