Is this heat stress??

[Handyandy]

Relatively new grower here.
Been having difficulties keeping temps and humidity under control last couple of weeks. This auto is in week 9 and top leaves curling up.
Is it heat stress or something else?
I have a fairly small and basic setup. Anything simple I can/should do? Is this issue likely to have major impact on the end results?

Temps - 25-32C (77-90F)
Humidity - 50-60%
EC - 1.2-1.4
PH - 6-6.2
Light - 200W COB LED ~ 40cm (16”)
Medium - Coco/perlite

Any input greatly appreciated

 

[Del boy]

Hello could be heat or low RH or both you want to be around 25c or slighty under but every cultivar is diffrent your plant will be ok it will still produce a good harvest just try and keep heat down

 

[TrichomeAssassin]

Raise the light a bit and see how it reacts.

 

[MrAutoGrower]

Cobs have a tendency of doing this because they don’t spread light out evenly. They leave “hotspots”. Raise your light. When the top leafs fold inwards on themselves, they are trying to protect themselves from the heat of your light.

 

[Handyandy]

Thanks for all the comments.
I’ve raised the lights couple of inches to see how it goes

 

[Jackson]

Do you have a fan to move air?

 

[bearhair]

What's the temp outside the tent or grow space?. do you have an extraction fan. If so you could use an inkbird plug in temp control to control the extraction fan and thus control the temp. Leaves also look really dark green. Maybe too much nitro, maybe

 

[Handyandy]

Do you have a fan to move air?

Yes, there is a fan oscillating above the canopy and one in the ground blowing air up through the plant

 

[Handyandy]

What's the temp outside the tent or grow space?. do you have an extraction fan. If so you could use an inkbird plug in temp control to control the extraction fan and thus control the temp. Leaves also look really dark green. Maybe too much nitro, maybe

Typically during lights on, outside temp is only few degrees lower but on hotter days, very similar.
Yes, I have a 4” extraction fan (with a carbon filter) constantly on.
Agree about the dark green leaves. I’ve backed off the base nutrients over last couple of weeks and increased the bloom nutes.

 

[Handyandy]

The top leaves aren’t looking great but since the buds are developing nicely, I’ve just let it her be… hopefully not too far away from harvest.