Not sure if this is light stress

[Dasnuggster]

Is this heat or light stress? The temperature are low 80s' humidity in the 40s. I'm using spider farmer sf4000 at just under 80%. It's a gsc..I grew it last year with a 400 mh/hps and had no problems. This is my first run with an led.

 

[jguit]

How close are your lights? LEDs can be VERY intense. What and how much are you feeding?

 

[visajoe1]

Plants would be happier if humidity was closer to 64% at those temps. The leaves are under a lot of pressure with that high VPD; leaf temps is too high. Which is why we see the serrated edges turned up on leaf edges, she's trying to cool down

Read about VPD when you have a chance, it will help you.

 

[HippiHemuli]

Plants would be happier if humidity was closer to 64% at those temps. The leaves are under a lot of pressure with that high VPD; leaf temps is too high. Which is why we see the serrated edges turned up on leaf edges, she's trying to cool down

Read about VPD when you have a chance, it will help you.

Joe is right. https://vpdchart.com/#C,46,25,23,0 Read about VPD and there is chart for you.

 

[freezeland2]

How close are your lights? LEDs can be VERY intense.

Definitely a learning curve going from HID to LED

 

[Dasnuggster]

How close are your lights? LEDs can be VERY intense. What and how much are you feeding?

They were about 20 incheses away. I moved them up an extra 6 inches. I'm using Gaia green 444 and giving them a tea every now and then.

 

[Dasnuggster]

Plants would be happier if humidity was closer to 64% at those temps. The leaves are under a lot of pressure with that high VPD; leaf temps is too high. Which is why we see the serrated edges turned up on leaf edges, she's trying to cool down

Read about VPD when you have a chance, it will help you.

Thanks I'll try to increase the humidity. I raised my lights an extra few inches as well.

 

[Dasnuggster]

Joe is right. https://vpdchart.com/#C,46,25,23,0 Read about VPD and there is chart for you.

Thanks for the link. I'm definitely reading up on this.

 

[Ponky]

Light be making em eat fast.