24/0 vs. 18/6 debate is over!!!!

T Ray said:

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Last post was a few months ago bud.

Shaded420 said:

Last post was a few months ago bud.

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First of all it was started in 2016, and the post before yours was in September 2, 2021.

That’s 4 almost 5 months since it was posted on. If that’s an active thread, I guess our definitions of active are different.

Its been brought up from the dead by Jenser with a 3 year between post. So I guess by that math you could call it active.

Plus, you gotta give me some credit for finding the Undetaker gif. It’s a classic. No hard feelings.

T Ray said:

First of all it was started in 2016, and the post before yours was in September 2, 2021.

That’s 4 almost 5 months since it was posted on. If that’s an active thread, I guess our definitions of active are different.

Its been brought up from the dead a couple of times.

Plus, you gotta give me some credit for finding the Undetaker gif. It’s a classic. No hard feelings.

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I mean if your definition of reviving a "dead thread" is one that is literally a few months recent, you've got a lot of gif posting to do my friend!

Shaded420 said:

I mean if your definition of reviving a "dead thread" is one that is literally a few months recent, you've got a lot of gif posting to do my friend!

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Let’s get back on point since this thread is a hot topic now. We’ve officially rose it from the dead and undertaker is proof.

I’m a 24/0 guy. I’ve tried them all but nothing does it for my girls like that 24/0 cycle. They just love it.

My bro told me and he heard it from his bro and we all agreed it’s science and that’s that.

T Ray said:

Let’s get back on point since this thread is a hot topic now. I’m a 24/0 guy.

I’ve tried them all but nothing does it for my girls like that 24/0 cycle. They just love it.

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18/6 guy myself, but have used 24/0 for periods of time

The debate isn't over and won't be until someone does a big study over many runs with multiple strains and carefully controlled and measured inputs. I think we are getting close too such a time when scientists will be able to do this is cannabis but I'm not sure we're quite there yet.

For my two cents, I tried a substantially different approach to veg, taking into account that we're looking for the best return on labor, time, space and energy invested. Soooooo I set a schedule of 8 hours on, 4 hours off twice a day. Did it slow things down? Yes, but by much less than might be expected. It was at least as good as 18/6, maybe better. I'm not sure why because I'm an empiricist more than a theorist but this way the lights were off a full third of the time without the loss of a third of growth.

Make of that what you will; it tells me we still have much to learn about our favorite plant.

Tried both. Under 24 hours of light the plants continue to grow but they look a little stressed.
It could be just me and my love of sleep.
My plants are happier under 18/6 because that's what makes me happier.
It's not really a debate, it's personal preference.
I didn't see enough extra growth to warrant having the lights on when electricity is at it's most expensive in the early hours of the morning.
No solar panels working then, maybe I'm just a tight arse?

The only difference I see is internodal length. It may be a positive or a negative to run 24/24 cycle compared 18/6 depending on strain and personal preference.

DLI

I like saving 25% on my electricity bill so I use 18/6. I also notice the plants seem happier.

ttystikk said:

The debate isn't over and won't be until someone does a big study over many runs with multiple strains and carefully controlled and measured inputs. I think we are getting close too such a time when scientists will be able to do this is cannabis but I'm not sure we're quite there yet.

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I agree....back in the 70's there were different opinions and misconceptions on how to control tobacco beetles in cigars.

The cigar industry gave a grant to an university to conduct a complete study, which is still to this day is considered the bible on the subject.

So eventually, we will have these types of professional scientific controlled studies that will establish rock solid evidence as to which method is best to grow marijuana, and/or which method is better for a particular situation.

I've been using 12 on, 5.5 off, 1 on, 5.5 off, repeat for veg; and 8 on 16 off for flower. I save even more on electricity and my buds are as good as they ever were. It's been working great for going on 3 years now. I was very skeptical at first, but it works.

Some male plants will even start showing under the 12/1 veg schedule and if they do, I cull those. The good males hold their flowers until the flip to 8/16. Some females like the Tahoe OG cut start to show trichomes under veg but they don't go all the way through and keep up the vegetative growth.

There is more to the cannabis plants photoperiod than is commonly understood.

GanjaClimber said:

Hello,
I am noob on my first grow but I have a healthy strain (l.a. woman) so I'd like to play with a the lights little bit and see what results I can get.

I began at 21/ 3
I plan on switching to 5:30/ 18:30 soon for the remainder of veg

For flower at first, I plan on going to 12/ 12 for the first 5 or maybe even 6 weeks. I will see how she's doing.
Then I'd like to drop the light even more like 10/ 14 and even if it takes an additional few days or week for her to finish, I have heard this can increase potency. Is this true?

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IDK, but I like landrace or close to it so I try to mimic the conditions the plant would experience at home. Afghanistan gets down that low so I would think its OK if genetics are down with it!

mafuki said:

Thats cool that you did that experiment and the results are interesting. I have also read from many other forums where growers performed the same experiment and found the opposite results. People a lot of the times say that its more natural for it to have dark time but Scientists are finding out just how addaptive C3 plants are to light changes especially hybrid starins that have been bred indoors for many generation. Also is Hydroponics natural? is growing your cannabis under a light source which isnt the sun natural? I mean we have plants with 25% thc which was unheard of in the 60's.

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yeah the old days when 4% thc mexican seed weed was all that was available. I think good breeding and science results in high thc levels we are fortunate to enjoy.

GrownAtHighAltitude said:

I've been using 12 on, 5.5 off, 1 on, 5.5 off, repeat for veg; and 8 on 16 off for flower. I save even more on electricity and my buds are as good as they ever were. It's been working great for going on 3 years now. I was very skeptical at first, but it works.

Some male plants will even start showing under the 12/1 veg schedule and if they do, I cull those. The good males hold their flowers until the flip to 8/16. Some females like the Tahoe OG cut start to show trichomes under veg but they don't go all the way through and keep up the vegetative growth.

There is more to the cannabis plants photoperiod than is commonly understood.

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What you've described is the classic "gaslight timing" designed to interrupt the dark cycle of photoperiod sensitive plants. It's called that because rich English people in early hot houses noticed they could keep seasonal plants in their vegetative phase by running gas lighting (all they had at the time, this was before electric lights) for an hour in the middle of the night.

Your next sentence is interesting; are you saying that your bloom cycle is 8 hours on and 16 hours off?

calvin.m16 said:

I like saving 25% on my electricity bill so I use 18/6. I also notice the plants seem happier.

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Do you set your lights to full power during veg?

It ain't over.

I am inclined to support 28.35 with the dli.

In my limited experience it seems that if the light intensity is lower then the plants use, then the extended hours to help make up total dli.

With increased light intensity the plants seem reach total usable dli earlier and tend to start showing issues such as taco leaves and nutrient imbalance.

This is why I have went to using:

- CFL on 24 hrs for cut and seedlings (50ish umol)

- led shop lights 18/6 for early veg in 1 gal pot (500ish umol)

- higher output led grow lights 15/9 late veg and autos, 13/11 flower set and stretch, 12/12 early flower, 11/13 late flower-ripening.

Nothing scientific, it works for my set up and helps keep plant count with timing between flowering and veg cycles.