Is this heat stress?

[Growingitalone]

Quick question for someone who has seen this before. I have got seven plants mid flower, one plant has curling leaves but only on the top of the plant, it is the one directly under the light, is this heat stress? I can lift the light if it is.
This is my first grow.
600w hps.
soil is canna terra professional.
Canna terra nutes.

Sorry about the poor pics I just snapped them then closed up the door as its getting rather smelly in the shed now.

 

[bam0813]

Yes

 

[Growingitalone]

Yes

Thank you

 

[jondamon]

Heat stress yes.

the severe leaf edge roll up is caused by drastic humidity differences between the leaf surface and the air which is caused by heat causing the drying of the leaf surface.

you can counter it by increasing your humidity and or lowering your temps.

 

[Growingitalone]

Heat stress yes.

the severe leaf edge roll up is caused by drastic humidity differences between the leaf surface and the air which is caused by heat causing the drying of the leaf surface.

you can counter it by increasing your humidity and or lowering your temps.

It's just that one single plant which was directly under the middle of the light, I've raised the light and put that plant into the far corner. My air is being drew in from outside of the shed, it has been high 80s humidity here the last couple of days. Now its at 60.