Leaves Rolling up

[kellmic5]

I recently switched from CMH to LED. I noticed that my leaves are rolling up the long way like tacos. I had them under 2X400W CMH and now have them under 2xROI-e680 @ 40% so 272W. To me it seems like they are acting like they are getting too much light, but they are getting 260W less. I have the e680's about 2 feet above the canopy. I was thinking I would inch the lights closer and turn up the intensity as they got used to the new light.

After I noticed the rolling of the leaves:

-I added CO2 (1000ppm). No change.
-Increased Humidity from 50%RH to 69%RH. No change.
-Increased one of the lights to 60% power. The plants under that light got worse.

It seems to me like the only factor could be the lights, but I'm shocked that they cant handle more. The only other factor I can think of is my temp. My day time temps are 69-77 and my night time temps are 63-69. Any thoughts on what could be causing this rolling? The plants otherwise seem healthy. They had a 6 week veg and I switched them to flower one week ago.

-Cheers!

 

[Kdoggy]

Whats your ph?

 

[Dape Green]

I just made the same switch, I really had to crank my temps well into the 80s

the same plants that took a 630 cmh no prob couldnot handle my scorpion at 2/3 power 410w

 

[Kocanna]

Whats your ph?

I keep the ph of my nutrient solution between 6.2 and 6.8.

 

[kellmic5]

I just made the same switch, crank those temps!

What temps would you recommend? I thought I remembered reading this in another thread (that you should increase temp with LED), but I couldn't find it or remember why that was recomended.

 

[Dape Green]

I’m running 84-86f @ 60%. you lost your IR light so you need higher room temps to get your leaf surface temp right.

 

[Dr. Who]

What temps would you recommend? I thought I remembered reading this in another thread (that you should increase temp with LED), but I couldn't find it or remember why that was recomended.

Under that lighting and with that Co2 use..
Try lights on temps over 80 and an RH of over 70%
The use of a good environmental controller will really help you out. Once you dial the data points into it right.

 

[kellmic5]

I just made the same switch, I really had to crank my temps well into the 80s

the same plants that took a 630 cmh no prob couldnot handle my scorpion at 2/3 power 410w

Very interesting. Do you think I need to increase my daytime and night time temps or just my daytime? I have two rooms connected to a lung room, that run on the opposite schedule to balance temps. I could put them on the same schedule to increase daytime temp. This would lower my night time temps though.

 

[Dape Green]

Well I’d avoid temp swings and high humidity. PM becomes a bigger concern now as well

 

[kellmic5]

I’m running 84-86f @ 60%. you lost your IR light so you need higher room temps to get your leaf surface temp right.

I thought the ROI e60 had IR diodes to compensate for this. That's great info Thank you!

 

[kellmic5]

Under that lighting and with that Co2 use..
Try lights on temps over 80 and an RH of over 70%
The use of a good environmental controller will really help you out. Once you dial the data points into it right.

Thanks for the response! I pretty much have complete environmental control. What would you say the minimum for night time temps would be if I'm at 80 daytime and 70+ RH?

 

[kellmic5]

Well I’d avoid temp swings and high humidity. PM becomes a bigger concern now as well

Because of the increase temps?

 

[Wizzlebiz]

Because of the increase temps?

PM loves cool humid environment.

During veg you want it humid. So the cool with that offers a great environment for PM.

 

[kellmic5]

PM loves cool humid environment.

During veg you want it humid. So the cool with that offers a great environment for PM.

So I need to make sure my night time temps are increased as well. Do you have a minimum night time temp recommendation?

 

[Wizzlebiz]

So I need to make sure my night time temps are increased as well. Do you have a minimum night time temp recommendation?

I just keep mine between 83 and 86 at all times. Simple and effective

I usually grow out doors. This is my 1st indoor grow. But from what I've seen so far it has been absolutely fine.

 

[Kocanna]

I just made the same switch, crank those temps!

I've heard p

I just keep mine between 83 and 86 at all times. Simple and effective

I usually grow out doors. This is my 1st indoor grow. But from what I've seen so far it has been absolutely fine.

Do you drop your temps towards the end of flower? That seems high to me.

 

[Daveindiego]

Like this?

 

[Kdoggy]

I find a low ph does that or low temp with low ph.

 

[Kocanna]

Like this?
View attachment 4792524

Kinda. Doesn't look as dry and the tips curl down instead of up. The "taco" faces up like that but the tip down.

 

[Kocanna]

I find a low ph does that or low temp with low ph.

Cool. I'll run my pH more to the upper end of my 6.2 to 6.8 and see if anything improves.