Higher temps and THC

jijiandfarmgang said:
I'm starting to wonder if I'm the only person not impressed by leds on RIU.

- Jiji
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You might be. Ive seen 3-4 grows on hear that looked to compete easily with HPS. Quality of bud was to the T, and yield was also great. About a 3x3 area is what i saw, and i think theirs someone with a lamp that covers 4x4. It would be real interesting to see how the 4x4 lamp does. Totally impressed by what their all doing.
 
AzaruleGreen said:
I'v read humidity plays a huge role in trichome levels (less humidity means more trichomes) and typically humidity is higher in hot temperatures, so I wonder what would happen if you could maintain a 15 to 20 % humidity level in the higher temperatures. It is much harder to maintain lower humidity when in a hot environment versus a colder environment. if anyone does do this experiment you have to pay attention to the color of trichomes and see if they become more opaque (convert more THC into CBN) faster then they would in colder temperatures. The reason I mention this is because it is possible the temperature doesn't directly effect the THC levels but rather increases humidity and perhaps the plants sensitivity to humidity? Very good question though I hope people with more knowledge post on here with some more info.
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You are pretty much referring to what is called vapor pressure deficit. Its not as easy as high temps low humidty because yes, plants are sensitive to humidity, very sensitive. High temps with low humidity will likely lead to plants wilting, they can only transpire at a certain rate, you have to get as close to that rate as you can with temps/humidity. High temps, relatively high humidity. Low temps, relatively low humdity.
 
DirtyMcCurdy said:
You are pretty much referring to what is called vapor pressure deficit. Its not as easy as high temps low humidty because yes, plants are sensitive to humidity, very sensitive. High temps with low humidity will likely lead to plants wilting, they can only transpire at a certain rate, you have to get as close to that rate as you can with temps/humidity. High temps, relatively high humidity. Low temps, relatively low humdity.
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VPD explains why I run in the low to mid 80s for temps and seventies for RH.

Age explains why I listen to the mid 80s, for B-52s and Devo....
 
jijiandfarmgang said:
I'm starting to wonder if I'm the only person not impressed by leds on RIU.

- Jiji
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There are plenty of folks who arent impressed but if they observed the grows done with top gear the only explanation could be denial.

In my experience denial is prevalent in all stoner forums. Maybe because critical thinking and being high arent the most compatible practices?
 
testiclees said:
There are plenty of folks who arent impressed but if they observed the grows done with top gear the only explanation could be denial.

In my experience denial is prevalent in all stoner forums. Maybe because critical thinking and being high arent the most compatible practices?
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I think the ability to think critically is independent of one's predilection for puffing pot pipes. I know lots of people who are good at thinking critically and nothing changes when they get high.

I smoke every day and I get comments about my thinking- or the results from same- on a daily basis. A few are even complimentary!
 
ttystikk said:
I'm about to build a monster COB LED array that will prove once and for all whether LED can scale up to larger grows- or if it's still a toy for postage stamp ops.

Frankly, my money is on LED...
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Good luck to you. I'd like to see this grow.

I'd bet you wouldn't do that well with leds, but I'd like it if you'd prove me wrong.

The only people that seem to do well are small scrogs. Which if thats what your into than I could see using leds.

- Jiji
 
ttystikk said:
I think the ability to think critically is independent of one's predilection for puffing pot pipes. I know lots of people who are good at thinking critically and nothing changes when they get high.

I smoke every day and I get comments about my thinking- or the results from same- on a daily basis. A few are even complimentary!
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ok good points...but you must admit your not going to defend your PhD dissertation stoned or logically entertain seriously complex issues stoned. Im familiar with smoking and also with cogent thinking. Stonedness certainly does not lend itself to rigorous disciplined thought.

I think that partially explains much of the baseless dogma that fills stoner forums.
 
jijiandfarmgang said:
Good luck to you. I'd like to see this grow.

I'd bet you wouldn't do that well with leds, but I'd like it if you'd prove me wrong.

The only people that seem to do well are small scrogs. Which if thats what your into than I could see using leds.

- Jiji
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This is exactly the assumption I aim to put to the test. I'm not saying you're wrong, I'm saying my hypothesis is that this is incorrect and I'm going to build a test rig to prove it one way or another.

Then, we'll KNOW.
 
testiclees said:
ok good points...but you must admit your not going to defend your PhD dissertation stoned or logically entertain seriously complex issues stoned. Im familiar with smoking and also with cogent thinking. Stonedness certainly does not lend itself to rigorous disciplined thought.

I think that partially explains much of the baseless dogma that fills stoner forums.
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Rigorous, disciplined thought is just that- a discipline, requiring practice to achieve and maintain.

At the other end of that scale of thought processes lives free form, unrestricted brainstorming.

In my humble opinion, Genius lies in being able to do both- or at least go back and forth- constructively.

Cannabis certainly helps me do this. Therefore, I believe it assists my cognitive process... and I'm not alone in this thinking. No one could reasonably accuse the late Dr. Carl Sagan of an inability to think critically- yet he was an early and vocal advocate for legalization, based on his own experience.

Not a bad refutation, eh? Especially considering I've been rippin' hard on my hash pen all morning?! :bigjoint:
 
ttystikk said:
This is exactly the assumption I aim to put to the test. I'm not saying you're wrong, I'm saying my hypothesis is that this is incorrect and I'm going to build a test rig to prove it one way or another.

Then, we'll KNOW.
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Cool. Maybe I am in denial lol. You know, maybe I will try a small led setup, for myself just to say I did it. If I ever get around to it. Not an experiment like what your doing which is more interesting. What I'd really like to do is have the terp profile analyzed compared to hps.

- Jiji
 
jijiandfarmgang said:
Cool. Maybe I am in denial lol. You know, maybe I will try a small led setup, for myself just to say I did it. If I ever get around to it. Not an experiment like what your doing which is more interesting. What I'd really like to do is have the terp profile analyzed compared to hps.

- Jiji
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That's an excellent suggestion! Should do it with HPS, MH, CDM and 315W LEC, too while we're at it.

And, from @RM3 's bright lil coffin o' T5 goodness, lest we forget!
 
jijiandfarmgang said:
Good luck to you. I'd like to see this grow.

I'd bet you wouldn't do that well with leds, but I'd like it if you'd prove me wrong.

The only people that seem to do well are small scrogs. Which if thats what your into than I could see using leds.

- Jiji
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it doesnt seem like youve done much research. Shitty leds will produce decent weed and decent weight excellent leds will outperform all other technologies.

Check out realstyles and greengenes, supra they arent small scrogs and all of em kill it on yield.

The terpene question is a good one. i think led would have anadvantage because of the coolness. With top leds 55% of tbe energy is going to photons with the best hid 65% is going to heat.
 
jijiandfarmgang said:
Cool. Maybe I am in denial lol. You know, maybe I will try a small led setup, for myself just to say I did it. If I ever get around to it. Not an experiment like what your doing which is more interesting. What I'd really like to do is have the terp profile analyzed compared to hps.

- Jiji
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Greengenes did a side by side, LED vs enhanced HPS using the blue dream clone-only. The LED bud tested higher in cannabinoids and terpenes and yielded higher in gpw. Something I have been coming to realize, even when my ambient temp is under control, actual bud temp also depends on light intensity. That is why many people prefer the mid level nugs rather than the uppermost in the canopy. Most varieties bud's really do not like high temps, CO2 or not. So even with high efficiency COBs and low canopy temps, I have to keep an eye on bud temp.

Captain Morgan if you know him is a no-BS kind of guy. He recently reported above 2 gpw with gorilla glue clone-only in scrog, COB grown. He is in the process of upgrading from 42% efficiency to 64% efficiency so in theory 3 gpw could be possible already. There is no lighting technology that has any hope of competing with that performance and cost has been coming down fast. There is no reason it cannot be scaled up, you can do it in a micro or in a warehouse.
 
There is also a gardener here doing a blue dream run i believe in a 4x4 space. Multiple plant grow on a table. Very excited to see his numbers as well.
 
jijiandfarmgang said:
Did you read this article? It is a great one.

Light dependence of photosynthesis and water vaor exchange chracteristics in different high THC yeilding varieties of Cannabis sativa L.

- Jiji
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Thanks, interesting article. Would have been nice if they gave the variation in THC content for different PPFD levels too. Still, it does show that growth increases right up to 2000 PPFD, which is sunlight at noon in summer.
 
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