LED Strip Thermal Paste

Randomblame

Randomblame

Well-Known Member
Slinging PAR said:
What if your leaves are warmer than ambient? How does that swing the chart?

Also what about altitude? Atmospheric pressure is a significant factor.

All the other forum crud aside, can you help others with the answers seeing as they all will have different environments.
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We can only try to give help, what actually going wrong everyone has to find out for themselves.
We can also help to rule out individual factors or suggest improvements that may or may not help.
Years ago I had a cheap PVC tent(sold as PE) that released toxic plasticizers. Nobody could help me, simply because the strange symptoms were still not easy to assign. In fact, it took me several tries and at the end I replaced the tent and suddenly the symptoms disappear. But I first had to do a flame test to find out that the tent material was made of PVC not PE.
His chipboard could release formaldehyde, who knows ...?

BTW,
how would one get higher leaf- than ambient-temps with LED's? I will not even try to answer these meaningless questions...all other crude aside!
 
S

Slinging PAR

Well-Known Member
It actually means that the leaf has reached saturation for light absorption and cycling the excess heat out. Increased water uptake as a result of increased plant transpiration and respiration. That doesn't result in increased plant matter because the photosynthetic process is tapped out and the leaf is using additional stored energy to deal with the extra heat. When the plant can't keep up, it gets all crispy.

Outdoor plants go through it everyday with mother nature adjusting VPD in tune with the sun.

I'll ignore the quip. Since I answered your question, will you take a stab at the ones I posted for the others? It is a great topic for growers to understand as you can really improve water and nutrient requirements.
 
Aolelon

Aolelon

Well-Known Member
Slinging PAR said:
It actually means that the leaf has reached saturation for light absorption and cycling the excess heat out. Increased water uptake as a result of increased plant transpiration and respiration. That doesn't result in increased plant matter because the photosynthetic process is tapped out and the leaf is using additional stored energy to deal with the extra heat. When the plant can't keep up, it gets all crispy.

Outdoor plants go through it everyday with mother nature adjusting VPD in tune with the sun.

I'll ignore the quip. Since I answered your question, will you take a stab at the ones I posted for the others? It is a great topic for growers to understand as you can really improve water and nutrient requirements.
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If it's so great, make your own thread about it. Leave this one alone as your talk is meaningless and irrelevant to anything in this post.
 
S

Slinging PAR

Well-Known Member
Aolelon said:
If it's so great, make your own thread about it. Leave this one alone as your talk is meaningless and irrelevant to anything in this post.
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random brought VPD into the discussion, it is his topic to start a thread on. Plus you aren't the thread originator and your quip deserves a:

I'm rubber and you're glue
Bounces off of me
And sticks to you!
 
Randomblame

Randomblame

Well-Known Member
Yeah, but I don't think they are simply oversaturated from too much light with only 200w of LED(he also vegged with 200w) and for this reason I brought VPD on the table.
If his hygrometer hangs somewhere on the wall and there is not enough air movement between the plants, the actual humidity could be much lower under the light.
As I said earlier, I suspect that several problems cause it together.
Maybe the hygrometer displays incorrect values and must be calibrated. I had to wrap one of my outdoor sensors in a wet towel for 3 hours (100% humidity) and take the batteries out and put it back in to calibrate it because it was over 20% off of the other sensors.
 
boilingoil

boilingoil

Well-Known Member
Thanks for the honest answers my friends !

So I dove a little farther into figuring this out last evening and I believe the culprit is the Happy Frog soil and a problem with it staying hydrated. After thinking back the bag of happy frog was given to me by my hydro store as a sample along with a bag of Cyco worm-mix. So I saturated my pots last night and this morning they are only half the weight as when they were fully hydrated after only 8 hours of lights out time. I'll dive into a little more today and see what the results are.
 
Randomblame

Randomblame

Well-Known Member
So they used half of the water in just 8h with lights off?
Rinse through to make the whole substrate 1x really wet could help. Maybe the water is not everywhere and you still have dry areas after watering!
I've not used happy frog soil but it seems loaded with lots of different fertilizers. You could do a quick EC/PH soil test(1:1,5 method) or get a soil test-kit from your hydro store.
Keep in check how much water they take up while lights on. Should be twice or tripple as much as at night.
 
boilingoil

boilingoil

Well-Known Member
Yes, this will be the third time I've done a total soaking of the medium. And I do mean soakings as in sitting the pot in a bowl of water and use capillary action while also watering from the top till plenty of run-off.
Only used happy frog one other time myself and that was to cut a bag of ocean forrest. Normally I use ocean forrest and cut it some with pro-mix hp for anything I don't run in coir.

One thing I am noticing is that the switch from HIDs to LEDs seems to require a slightly different nutrient profile. Healthy plant under the HIDs become cal-mag deficient when switched to LEDs or at least that's what I'm experiencing in my change over to LEDs.
 
Aolelon

Aolelon

Well-Known Member
Not exactly, I did have some calmag issues at first but got em sorted out. I started fighting a whole new monster recently lol
 
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Randomblame

Randomblame

Well-Known Member
Aolelon said:
Wonder what causes it.
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These guy describes it the fast way but hits the point really well. Most of the time it's too much calcium what cause these issues together with a high VPD because of a too low humidity. Since I set my humidity to 60% with 28-30°C I've not encountered any calmag issues. I still use it, but not as much as earlier and I've also lowered my nutrient strength. Basically, it is stretched by 20% with water, nothing else.

 
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boilingoil

boilingoil

Well-Known Member
Randomblame said:
Most of the time it's too much calcium what cause these issues together with a high VPD because of a too low humidity.
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I would agree but my temps and RH are in the green on that scale. 54% RH and 77 degrees.
Unfortunately right now pics are not uploading for me or i would show what's happening.
I've pretty much ascertained it a medium problem on my end as plants that were switched to under the halides still exhibit the same symptoms after 3 days of being switched.
 
boilingoil

boilingoil

Well-Known Member
Just for a reference on my VPD.
This plant was switched from MH to the LEDs 3 days ago and I definitely see a cal and more than likely a mag diff. also.
DSCN0859.JPG

And a plant with the problems switched to MH 3 days ago amongst her sisters under MH their entire life.
DSCN0857.JPG
 
ANC

ANC

Well-Known Member
boilingoil said:
Just for a reference on my VPD.
This plant was switched from MH to the LEDs 3 days ago and I definitely see a cal and more than likely a mag diff. also.
View attachment 4130553

And a plant with the problems switched to MH 3 days ago amongst her sisters under MH their entire life.
View attachment 4130555
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Don't start playing the calmag game mate. Go buy some nice vermicompost and stir it in the top, then make a tea with a handful of the leftover VC. And water the coco to innoculate it.
I spend weeks chasing my tail with a PPM meter and calmag until I just listened to a horticulturist with experience of coco and cannabis. It does help starting out with good coco that is properly buffered and loaded.
 
ANC

ANC

Well-Known Member
considering what a pain it is getting that stuff off, it should work....
 
OLD MOTHER SATIVA

OLD MOTHER SATIVA

Well-Known Member
ANC said:
Don't start playing the calmag game mate. Go buy some nice vermicompost and stir it in the top, then make a tea with a handful of the leftover VC. And water the coco to innoculate it.
I spend weeks chasing my tail with a PPM meter and calmag until I just listened to a horticulturist with experience of coco and cannabis. It does help starting out with good coco that is properly buffered and loaded.
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It does help starting out with good coco that is properly buffered and loaded

>yeh with calcium and magnesium

ps i will try the vermi castings too..
 
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