Not sure if this is light stress

Dasnuggster · Dec 24, 2021

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 · Dec 25, 2021

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

visajoe1 · Dec 25, 2021

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 · Dec 25, 2021

visajoe1 said:
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 · Dec 25, 2021

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

Definitely a learning curve going from HID to LED

Dasnuggster · Dec 25, 2021

jguit said:
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 · Dec 25, 2021

visajoe1 said:
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 · Dec 25, 2021

HippiHemuli said:
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 · Dec 25, 2021

Light be making em eat fast.

Not sure if this is light stress

Not sure if this is light stress

Dasnuggster

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