Heat Output - COB vs LED

wietefras said:

Sorry, I didn't mean to imply that it was me doing the auto runs on 24/0. That's a pm-pal of mine. I only used 24/0 for vegging photo period plants (cuttings).

Don't like auto's personally. I want to be able to decide when the plants are ready to switch to flowering

Although I have done several 12/12 grows where you immediately start on 12/12 light after planting the seeds. I do like that somewhat. It tends to yield a bit more and it shortens the grow (mostly by using more/smaller plants). Dealing with the different pheno types seeds give you can be a hassle though.

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Yeah, same here but my night temps in winter can be as low as ~10°C or less. Usually I go with daily waterings when light goes on. They get 0,3-1l lukewarm water to warm up the root zones, but that sucks and I do not like watering daily for obvious reasons.
Automatics are getting better and better year after year and meanwhile they produce more or less comparable results. Not comparable to first generation auto's.
I have had 5 Pandora's outdoors on the balcony maybe 5 years ago. It was not the badest quality smoke but only half an oz per plant, lol! And that although they stood in high 3gal. pots with Compo...
But seedbanks like Dutch Passion, DinaFem, SweetSeeds, Humbolt and all the others have some promising latest generation varieties now. A lot more productive and comparable quality to regular/fem. seeds.
Maybe I'll try an auto haze strain or something with 70-80 day rating.

KonopCh said:

My plants get too much light and they're droopy/sad before lights go out. If I use all watts I have. That means they received too much light, and this is way less than 1500 PPFD or 35 DLI.

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No, that just shows that your assumption that drooping leaves means "max DLI has been reached" is incorrect. Or something else is not keeping up in your grow.

I see drooping after about 16 hours, other than exceeding max DLI, what might cause it?

wietefras said:

No, that just shows that your assumption that drooping leaves means "max DLI has been reached" is incorrect. Or something else is not keeping up in your grow.

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LOL okay. I know how I grow.
Keep blasting your plants with 1500 PPFD.

wietefras said:

No, that just shows that your assumption that drooping leaves means "max DLI has been reached" is incorrect. Or something else is not keeping up in your grow.

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I have to agree with him, under my samsung strips my plant droops when I give it too much DLI (~600-700ppfd for 18 hours a day, 37 dli iirc) in veg, at the end of the day mostly.

wietefras said:

Please. "Exceeding max DLI" is a nonsense claim that probably that "light researcher"/"something slinger" troll made up. There is no such thing.

These plants can take 1500PPFD for 18 hours. You'd need to go over 1100PPFD to beat that in 24 hours. How likely is that to happen? By accident no less. Actually they can even do 2000PPFD. Probably even higher.

If anything, running the plants for 24 hours would mean that you can buy a cheaper light and give them the same DLI as you would in 18 hours.

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With very diffuse light or light on a light mover similar to our sun, yes they can take those insane PAR numbers. Outside where i am in colorado it is 50 DLI right now. But the sun moves, clouds diffuse sunlight, etc etc. and makes plants able to take WAY more photons.

I would say that's normal behavior at the end of the day. Plants find their rhythm. Watch a few time-lapse videos, the plant puts its leaves in the light when the day starts, and let's them hang "before" the night breaks in.
If they are bent down all day long, they have probably their stomata closed, then either something with the soil is not ok (overloaded with nutes, too wet, too dry) or your environmental conditions are not optimal (too hot, humidity to low, ..).

KonopCh said:

LOL okay. I know how I grow.

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Yeah you know how you grow, but that drooping leaves show max DLI has been reached is not based on reality.

Like Randomblame says, plants always lower their leaves at the end of the day. Do they always reach max DLI at the end of the day? Or do they simply adjust their rhythm and morphology to what they receive?

wietefras said:

Yeah you know how you grow, but that drooping leaves show max DLI has been reached is not based on reality.

Like Randomblame says, plants always lower their leaves at the end of the day. Do they always reach max DLI at the end of the day? Or do they simply adjust their rhythm and morphology to what they receive?

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My plants don't drop at the end of the day, if I dim the lights to around 25-28 DLI.
So this clearly shows that I have too much light. They're healthy otherwise, so no overwatering, underwatering, too little O2, or whatever reason.

Two auto plants in SCROG, with happy "posture":



And last batch:



I don't know about you guys, but I don't like to look at sad plants. They must pray!

nice scrog man,

KonopCh said:

So this clearly shows that I have too much light.

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Oh sorry I didn't know that you had a few random photo's of plants. If you have photo's then that proves it without a shadow of a doubt yes. Wow, done deal right there.

Seriously though, leave angles are signs of a lot of things. They point upwards "praying" because of too hot, too dry, too much, too high nutrients level light etc etc etc. And with some strains it's not a problem at all. They droop down because of a lot of reasons too. Stop pretending that it's just one reason.

If your plants can't deal with 800umol/s/m2 then your plant care is lacking in other areas.

KonopCh said:

My plants don't drop at the end of the day, if I dim the lights to around 25-28 DLI.
So this clearly shows that I have too much light. They're healthy otherwise, so no overwatering, underwatering, too little O2, or whatever reason.

Two auto plants in SCROG, with happy "posture":

And last batch:

I don't know about you guys, but I don't like to look at sad plants. They must pray!

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That last run/picture does not look healthy at all. I think you need to listen to these guys when they say get your plant care in order and things should be much better all around. Seen alot of grows with 50 to 60 watts per square foot both led and hid where plants were happy and healthy.gl

This got a bit off-topic, but as long as it stays scientific, I'm with it.

Aunt Bob said:

That last run/picture does not look healthy at all. I think you need to listen to these guys when they say get your plant care in order and things should be much better all around. Seen alot of grows with 50 to 60 watts per square foot both led and hid where plants were happy and healthy.gl

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Yes, they don't look pretty because it's their last day. And I give them pure tap water in coco, which I shouldn't, but I wanted to save some nutes for last week and use tap water instead.

I still stand behind my words, they get too much light if they drop before lights go out. Yes, it's not the only reason, but it's one of them if they're healthy and if there is no other reason.

Btw, wietefras, they're autos and of course they cannot handle 800 PPFD, that's why I use word "DLI".

Anyway, I would love to see how your plants for you guys here, can handle 1500 PPFD without CO2. Make perfect environment for that much light and shows us video through the day. I bet they will be droopy. That's their defense.