Light saturation until CO2?

[Millo]

Hey. Quick question.

I recently acquired another light and since I installed it in my tent with my other light, I noticed some stress in the plants.

Is this matemathically too much light for my space without adding CO2?

Tent is 27"x27"x62" (70cm x70cm x160cm)

Lights are:

SpiderFarmer SF1000 (100W)
HLG 100 V2 3000K (100W)

 

[WubbaLubbaDubDub]

It very well could be too much light.
What kind of distance are they from the plants?
Do you or a friend have a lux or par meter you can use?

Edit-
are you comfortable posting a picture or two?

 

[Millo]

It very well could be too much light.
What kind of distance are they from the plants?
Do you or a friend have a lux or par meter you can use?

Edit-
are you comfortable posting a picture or two?

I have 2 autos inside.

One under the HLG, at 20" because it recovered faster from the light stress.

The other is under the SF1000 at 30" and 40% intensity because it's more stressed.

Sadly I do not have a par meter. Lux meter phone app only but it's shit.

I'm at work atm, hold on let me check if I can find some pics on my phone.

 

[Millo]

Nope, I deleted all the photos.
I can link you the threads I made for the same issues. Plants are a bit younger but you can see them.

This is the main journal:

Blue Cheese Auto + White Monster Auto

Planted today. Strains: Blue Cheese Auto from RQS White Monster Auto from Zamnesia Medium: Blue Cheese - BioBizz AllMix soil White Monster - BioBizz LightMix soil Light: HLG 100 V2 3000K @ 30" Room: Indoor greenhouse Will move to grow tent in the future Water: Tap, rested 24H

rollitup.org

Those are the threads:

Drooping for days help!

Hi. Plant is drooping for days and I have no clue why. I'll try to include as many details as I can. Blue Cheese auto from RQS. Germinated on 10/03 so she's 4 weeks old. She's been growing for 3 weeks in a cheap greenhouse inside my room because my 2.3"x2.3" tent was full. She was under an HLG...

rollitup.org

Yellowing from inside out help

Hey guys! Noticed today some of my leaves are yellowing in a weird way. Also some yellow tips. Can you help me out? White Monster Auto 5 & 1/2 weeks old from sprout HLG 100v2 3000k @ 22" BioBizz Light-Mix soil 1.2 ml/L Bloom and TopMax 0.6 ml/L Alg-a-mic 0.1 ml/L calmag

rollitup.org

Cal def? Help

Hi all! Been having Mg def ( leaf yellow with green veins ) the last couple days so I proceeded to spray epsom salts on the leaves. Today I noticed the leaves completly turned yellow and they show some brown marks. Could this be Cal def? Although I've read that using tap water should providr...

rollitup.org

Thanks for the help! @WubbaLubbaDubDub

 

[Therrion]

I would recommend Co2 at anything over 800ppfd. Look at the floorprint/hanging height specifications and just adjust your light height until you get dead center at 800ppfd, then you only need to maintain ambient air co2. Without a par meter that will require some math and understanding the exponentials of diminishing light.

 

[Millo]

I would recommend Co2 at anything over 800ppfd. Look at the floorprint/hanging height specifications and just adjust your light height until you get dead center at 800ppfd, then you only need to maintain ambient air co2. Without a par meter that will require some math and understanding the exponentials of diminishing light.

Thanks! Yeah, the HLG is non dimmable so only height varies. The SF is dimmable but I'll stay on the lowest settings and go from there based on plant's response...
800ppfd is for flowering ( I guess? ). Perhaps 300 for seedlings and around 500/600 in veg?

 

[OSBuds]

 

[Therrion]

Thanks! Yeah, the HLG is non dimmable so only height varies. The SF is dimmable but I'll stay on the lowest settings and go from there based on plant's response...
800ppfd is for flowering ( I guess? ). Perhaps 300 for seedlings and around 500/600 in veg?

Yes, more or less. Indica leaning plants tend to be more light sensitive. I have a Ghost Train Haze clone , that's mostly sativa, she can withstand close to 1500ppfd. My Cornbread would be really stressed at that light intensity.

 

[Rocket Soul]

Remember that when you run autos on a longer cycle the light stress is down to cumulative light exposure. The numbers mentioned above would be for regs in flower. With autos they get up to double the light due to longer light cycle.

When it comes to light stress with LEDs many times just adding a bit of heat is enough. I doubt co2 would be much use to toughen up your plants to light.

 

[Millo]

View attachment 4889353

Thanks mate, nice chart

 

[Millo]

Remember that when you run autos on a longer cycle the light stress is down to cumulative light exposure. The numbers mentioned above would be for regs in flower. With autos they get up to double the light due to longer light cycle.

When it comes to light stress with LEDs many times just adding a bit of heat is enough. I doubt co2 would be much use to toughen up your plants to light.

That's a clever insight but in my particular case I run them on 16/8 cus the tent is in my bedroom and I turn everything off when I go to sleep.

Adding a bit of heat you say? I thought heat was a no-no. I was getting worried cus it's getting hotter outside and my tent reaches peaks of about 28C-82F. This summer will be problematic....