18 or 24? And what's the difference??
- Thread starter odogg420
- Start date
wannaquickee
Well-Known Member
if from seed i do 18, taking clones i do 24 because i usually do sog with the clones. its easier not to worry about light cycles.
some people believe that the roots grow faster in 24..i never really noticed a difference. i do not know the facts of this. im just telling you what i have tried/experienced.
some people believe that the roots grow faster in 24..i never really noticed a difference. i do not know the facts of this. im just telling you what i have tried/experienced.
hughesresearch
Well-Known Member
agreed. i do sog as well with clones. it may vary on strain with seed maybe?
Jankedyjoe
Active Member
With 24 hours you: get more electricity consumption. That is the only 100% everything else is just hearsay. Some people believe it helps them grow more and faster, some people say it does nothing at all. After 18 hours, they need to rest irrelevant of if you wanna turn the lights off. Other people say thats not true and they will rest when you let them. Then it goes into stress, does it stress them? maybe. I have done both and found the result were pretty damn close. Not big enough to go "hey! everyone, big news! I figured it out!!!!"
With 18 hours you: save money. Simple as that. But you need a timer, so maybe you don't in the long run? Well you need a timer sooner or later anyway, so its up to you.
Unless they are an auto-flowering strain. I have been reading that it matters somewhat then, or maybe it matters even less, another debate. I don't know much about this one, so you're gonna have to read up on that one yourself unless someone comes along and supplements what I have said. I have only read a very little on auto-flowers because I never intend to grow them.
good luck!
With 18 hours you: save money. Simple as that. But you need a timer, so maybe you don't in the long run? Well you need a timer sooner or later anyway, so its up to you.
Unless they are an auto-flowering strain. I have been reading that it matters somewhat then, or maybe it matters even less, another debate. I don't know much about this one, so you're gonna have to read up on that one yourself unless someone comes along and supplements what I have said. I have only read a very little on auto-flowers because I never intend to grow them.
good luck!
Nunyer G. Dambiznes
Member
I can only tell you what I do personally. Both 18 and 24 hour light cycles will clone/veg just fine... personally I have a nice Flouro box that stays on 24/7 for clones. Humidity is 90%, Temp is 80. After my clones are well rooted, I put them into pots and move them to the Veg chamber where they are on 18/6 with a HPS/Flouro combo... Seems to work well and root fast... My clones are literally crawling out of their cubes by day 10.
Oldreefer
Well-Known Member
Are you kidding? Perhaps you need to read some more.........
Actually leaving them on 24/0 will extend the life of the bulbs (Total hours not day cycles), I don't know about capacitors.
oh cool thanks for the info. I don't actually know what caused mine to blow, I took it to the hydostore they said it was "unrepairable" and tried to sell me a new one. cost me $20 for the capacitor and just wired it back in myself, no problems since. I've had one 600w bulb blow, and it wasn't even a few months old. I've just been replacing the 400w every few grows or so, any recommendations on when to replace them?
Viagro
Well-Known Member
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
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
sorry I have no information on that, I'm sure it's out there somewhere. A light meter would tell you when it's deterioratated too much. When you are growing money trees I wouldn't wait too long.
Ed is THE man as far as I'm concerned, good to know he's on board with 24/0.
I copied those texts and saved them.
Don't be suprised to see me quoting them in the future.
I'm sick of seeing newbies posting that plants need to "rest" every day.
HID are usually replaced around 8-12 months. If I'm remembering correctly they will lose around 50% of their spectrum within 12 months. People I know with PAR meters (lucky bastards!) replace at 6 months... I'd do a google search though to verify my info, been a while, but you can find par tests showing the actual degradation in MH at the very least.
Other tech's like T5's degrade much slower.
It's great to see all the fallacious claims of 24/0 being bad finally being put to rest. Anyone who has grown in 24/0, and recognized that the plants will be more demanding with more light, will tell you things simply grow faster. I run 24/0 and cut to 18/6 when I need to cut back on growth. It works great, and is the best evidence I have found for the benefits of 24/0
Oldreefer
Well-Known Member
Well said....I am one who does 24/0 through veg or autos....
I already got a chance to posts that info and got repped for it, heheh, turning out to be a good day.
those figures sound familiar to me, With such a valuable crop it would be foolish to push the bulbs any further than 75 % original output.