Light Stress? Heat Stress?

[GameTight]

There is a slight twist at the ends of the leaves on this plant

Growing in Kindsoil
Using Sun Systems 630w LEC light
Running on a 20/4 light schedule

Overall the grow looks good but just want to get ahead of something that could be brewing.

 

[CannaRuss]

Overall the grow looks good but just want to get ahead of something that could be brewing.

What is the average and high Temperature? Humidity? How far from the lights?

 

[Autobeast]

Heat stress or wind burn id say.is ur fan blowing heavily directly at ur plants?

 

[GameTight]

Light is about 26 inches away from the plants. It's recommended a 630w lec is atleast 2 feet away. Maybe I should move it about 3 feet away.

It's weird b/c thats the only 1 of the plants that is reacting that way. I have 3 others at the same age and growth that look unaffected.

Avg temp and humidity is about 81 degrees/52 percent humidity

 

[idiopathic neuropathy]

Is that a different strain than the others ? Reason I ask is that plant maybe a little sensitive to nitrogen which looks like it is very green and and tips turning down ...maybe just maybe a beginning stage of N toxicity...other plants look very dark green to....but not a bad thing ...you could just reduce N. And read the leaves after a few days...but the damaged leaves won't repair themselves..but just a guess....trying to help...very valid what autobeast said above though.

 

[GameTight]

Im growing in Kindsoil/Supersoil and any additional nutes are not recommended by the company. However if need be I can purchase some and make adjustments if need be.

I have a fan but it's not blowing directly on the grow at all. More so pointed at the light to help push hot air from the source around. Funny thing thats the only plant doing that. I have 2 other strains of the same type (Gelat.OG). Any info helps guys. Thanks.