20/4 vegetative light cycle

KronDonSmoker

KronDonSmoker

Active Member
18/6 is the way to go from what ive read here and other places the plants photoperiod is 18 hours after that it doesnt benefit the plant too keep it on
 
Mari

Mari

Well-Known Member
Have light problem and now I'm with CFL only which is for autoflower grow. My plan was to put new grow under this light, max 2-3weeks (from sprout), then put under normal light and cycle. Strain is regular, no autoflower.
 
F

frmrboi

Well-Known Member
Mari said:
Can I veg on 20/4 (20 light/4 dark) cycle (CFL light)?
Click to expand...
you can go 24/0 if you want maximum growth.

24/0 is best. -Ed Rosenthal
This is a direct quote from Ed Rosenthal whom most of you know is a marijuana growing guru:
----------------------------------------------
marijuana plants photosynthesize as long as they receive light as well as water, air, nutrients and suitable temperature. Photosynthesis is the process in which plants use the energy from light (primarily in the blue and red spectrum's) to combine carbon dioxide (CO2) from the air and water (H2O) to make sugar while releasing oxygen to the air.
Plants use sugars continuously to fuel metabolic processes (living) as well as for tissue building. The plant combines nitrogen (N) with the sugar to make amino acids, the building blocks of proteins. They are the substance of plant tissue. When the light is off, the plant's metabolic processes, respiration and growth, continue.
The plant can photosynthesize continuously so it produces the most energy and growth when the light is on, continuously. Continuous light does not stress the plant, which reacts somewhat mechanistically to it.
Plants under an 18-6 light-dark regimen are producing sugar only three quarters of the time. They are thus growing at only 75% of their potential. Leaving the light on continuously will result in bigger plants, faster, which leads to higher yields."
-------------------------------------------------------------
"The following information is straight from Greg Green's "The Cannabis Grow Bible"
Cannabis is a light demanding plant. Professional growers keep the light on their plants using the 24/0 photoperiod for this reason. Plants that grow under 24/0 flourish and do not need a quantity of darkness in order to rest and perform photosynthesis properly. Plants that are grown in optimal conditions under 24/0 light regime grow vigorusly and the benefits of a 24/0 photoperiod can be seen actively in the results. More nodes are formed, more branches are created, leaf numbers increase, the plant is growing at its finest.
Some growers opt to use 18/6 as their photoperiod. This is 18 hours of light, six hours of darkness light regime. Under these conditions the plant will grow quite naturally but not as vigorously as the 24/0 photoperiod.
The 18/6 photoperiod expels 3/4 the amount of light that a 24/0 photoperiod does. Although this does not mean that a plant produces 1/4 less leaves,branches and nodes under the 18/6 photoperiod, it certainly does show the correlation between light and cannabis growth. As we have said already, cannabis is a light demanding plant. There are no problems associated with 24/0 and although some have attributed cannabis sexual dysfunction (the hermaphrodite conditon) to 18/6 photoperiod these problems are actually the result of heat stress.
A 24/0 photoperiod requires that your grow room temperature be kept well monitored. The 18/6 option is cheaper to run. You use a quarter less electricity and this will have an impact on your electricity bill. Also the 18/6 photoperiod will generally extend the bulb's lifespan. During the 6 hours of darkness the grow room is allowed to cool down for this period but a well maintained good grow room setup should not require a cooling down period.
24/0 and 18/6 both share the same problem though. Once you start the photoperiod you should keep that way especially when the plants near maturity (the preflowering stage). An irregular photoperiod can cause more males than females to develop. It can also cause sexual dysfunction to appear. Whether you choose 24/0 or 18/6 as your vegetative photoperiod try to keep that photoperiod unitl your plants are mature enough to express their sex."
24/0 is superior insofar as plant growth
 
TsmokeTrain

TsmokeTrain

Well-Known Member
i dont know if its weird to comment on 2 year old forum but whatever.
I heard 20/4 which is what you asked for in the first place and not 24/0 which you people assumed, i read somewhere that it was best for the plants.
it was a reply on another forum but it said that using 24/0 hours would get you more then 18/6 but 20/4 would get you most.
i guess it is because the plant makes energy during the light period for the sleeping period, but lost most its energy after 4 hours of dark. 24/0 would be a waste of electricity but also a waste of the energy the plant was saving for the dark period, which is never going to occur.
I also think its best to let your stuff cool down so it goes a longer way with all this planned obsolescence n shit
Peace Tsmoke
 
C

Cannaburter

Member
frmrboi said:
you can go 24/0 if you want maximum growth.

24/0 is best. -Ed Rosenthal
This is a direct quote from Ed Rosenthal whom most of you know is a marijuana growing guru:
----------------------------------------------
marijuana plants photosynthesize as long as they receive light as well as water, air, nutrients and suitable temperature. Photosynthesis is the process in which plants use the energy from light (primarily in the blue and red spectrum's) to combine carbon dioxide (CO2) from the air and water (H2O) to make sugar while releasing oxygen to the air.
Plants use sugars continuously to fuel metabolic processes (living) as well as for tissue building. The plant combines nitrogen (N) with the sugar to make amino acids, the building blocks of proteins. They are the substance of plant tissue. When the light is off, the plant's metabolic processes, respiration and growth, continue.
The plant can photosynthesize continuously so it produces the most energy and growth when the light is on, continuously. Continuous light does not stress the plant, which reacts somewhat mechanistically to it.
Plants under an 18-6 light-dark regimen are producing sugar only three quarters of the time. They are thus growing at only 75% of their potential. Leaving the light on continuously will result in bigger plants, faster, which leads to higher yields."
-------------------------------------------------------------
"The following information is straight from Greg Green's "The Cannabis Grow Bible"
Cannabis is a light demanding plant. Professional growers keep the light on their plants using the 24/0 photoperiod for this reason. Plants that grow under 24/0 flourish and do not need a quantity of darkness in order to rest and perform photosynthesis properly. Plants that are grown in optimal conditions under 24/0 light regime grow vigorusly and the benefits of a 24/0 photoperiod can be seen actively in the results. More nodes are formed, more branches are created, leaf numbers increase, the plant is growing at its finest.
Some growers opt to use 18/6 as their photoperiod. This is 18 hours of light, six hours of darkness light regime. Under these conditions the plant will grow quite naturally but not as vigorously as the 24/0 photoperiod.
The 18/6 photoperiod expels 3/4 the amount of light that a 24/0 photoperiod does. Although this does not mean that a plant produces 1/4 less leaves,branches and nodes under the 18/6 photoperiod, it certainly does show the correlation between light and cannabis growth. As we have said already, cannabis is a light demanding plant. There are no problems associated with 24/0 and although some have attributed cannabis sexual dysfunction (the hermaphrodite conditon) to 18/6 photoperiod these problems are actually the result of heat stress.
A 24/0 photoperiod requires that your grow room temperature be kept well monitored. The 18/6 option is cheaper to run. You use a quarter less electricity and this will have an impact on your electricity bill. Also the 18/6 photoperiod will generally extend the bulb's lifespan. During the 6 hours of darkness the grow room is allowed to cool down for this period but a well maintained good grow room setup should not require a cooling down period.
24/0 and 18/6 both share the same problem though. Once you start the photoperiod you should keep that way especially when the plants near maturity (the preflowering stage). An irregular photoperiod can cause more males than females to develop. It can also cause sexual dysfunction to appear. Whether you choose 24/0 or 18/6 as your vegetative photoperiod try to keep that photoperiod unitl your plants are mature enough to express their sex."
24/0 is superior insofar as plant growth
Click to expand...
I love responding to 10 year old posts. MySpace had not yet lost it's foothold on social media. We were less connected but somehow closer.
Where are you at now? Still growing?

A couple irrelevant points 10 years later is that Ed Rosenthal said --"marijuana plants photosynthesize as long as they receive light as well as water, air, nutrients and suitable temperature."
And Greg Greene
" Plants that are grown in optimal conditions under 24/0 light regime grow vigorusly and the benefits of a 24/0 photoperiod can be seen actively in the results"
The Air part and "optimal conditions" are very key, as the lack of CO2 concentration (without supplementation), while not too harmful, is not helpful at all. So some economy setups may benefit from a bit of dark cycle.


I just popped my posting Cherry on an elderly post....word
 
S

Smitty2323

Member
TsmokeTrain said:
i dont know if its weird to comment on 2 year old forum but whatever.
I heard 20/4 which is what you asked for in the first place and not 24/0 which you people assumed, i read somewhere that it was best for the plants.
it was a reply on another forum but it said that using 24/0 hours would get you more then 18/6 but 20/4 would get you most.
i guess it is because the plant makes energy during the light period for the sleeping period, but lost most its energy after 4 hours of dark. 24/0 would be a waste of electricity but also a waste of the energy the plant was saving for the dark period, which is never going to occur.
I also think its best to let your stuff cool down so it goes a longer way with all this planned obsolescence n shit
Peace Tsmoke
Click to expand...
I'm so glad u said all that. I've been looking everywhere for comments on 20/4 and all I find is 24/0 comments. I'm a new grower but I've found my plants reacted better to 20/4 than 18/6. I would never force any living thing to be awake 24 hours a day. I'm sorry but that can't be healthy for a plant. With everything you will lose something by trying to gain speed.
 
twentyeight.threefive

twentyeight.threefive

Well-Known Member
Smitty2323 said:
I'm so glad u said all that. I've been looking everywhere for comments on 20/4 and all I find is 24/0 comments. I'm a new grower but I've found my plants reacted better to 20/4 than 18/6. I would never force any living thing to be awake 24 hours a day. I'm sorry but that can't be healthy for a plant. With everything you will lose something by trying to gain speed.
Click to expand...
Why is it that a first time poster needs to reply to a post originated 11 years ago?
 
Star Dog

Star Dog

Well-Known Member
Smitty2323 said:
I'm so glad u said all that. I've been looking everywhere for comments on 20/4 and all I find is 24/0 comments. I'm a new grower but I've found my plants reacted better to 20/4 than 18/6. I would never force any living thing to be awake 24 hours a day. I'm sorry but that can't be healthy for a plant. With everything you will lose something by trying to gain speed.
Click to expand...
A plant isn't ever sleeping it goes/grows 24hrs a day.
 
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