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Invisibleniteowl
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Registered: 04/20/08
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Lighting question.
    #1721 - 04/20/08 05:11 PM (8 years, 7 months ago)

I have 2 small plants (about 2 weeks old) growing in a closet with 4, 40 watt florescent bulbs.

What is a good lighting schedule for them in this early stage of growth?


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-


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OfflineSirius
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Re: Lighting question. [Re: niteowl]
    #1770 - 04/20/08 05:26 PM (8 years, 7 months ago)

My friend hasn't grown indoors yet, but from what has been read, keep it on 24/7 for the vegetative growth.


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Invisibleniteowl
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Re: Lighting question. [Re: Sirius]
    #1774 - 04/20/08 05:29 PM (8 years, 7 months ago)

I was told that the plants do a lot of their growing during the dark hours.

I was thinking about 14-18 hours of light per day and 6-8 hours of dark per day.

Or is it better to just let them have it for 24/7


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-


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InvisibleScript
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Re: Lighting question. [Re: niteowl]
    #1781 - 04/20/08 05:32 PM (8 years, 7 months ago)

18hrs a day for vegetative growth.


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OfflineD4NK
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Re: Lighting question. [Re: Script]
    #1928 - 04/20/08 06:12 PM (8 years, 7 months ago)

I've heard both 18/6 and 24/0 light schedules for vegetative. Does anyone have firsthand experience with both?


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InvisibleToiletduk
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Re: Lighting question. [Re: D4NK]
    #2703 - 04/20/08 08:04 PM (8 years, 7 months ago)

Yes, 24 hour lights won't do them good. They need a period of darkness for health.


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Invisibleniteowl
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Re: Lighting question. [Re: Toiletduk]
    #2771 - 04/20/08 08:20 PM (8 years, 7 months ago)

Thats what I thought.

Is 18 hours of light too much now?


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-


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InvisibleToiletduk
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Re: Lighting question. [Re: niteowl]
    #3170 - 04/20/08 09:53 PM (8 years, 7 months ago)

Yes, mine really grew on an 18/6 schedule. My cat kept picking at them, though.


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Offlineecto
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Re: Lighting question. [Re: Toiletduk]
    #3893 - 04/21/08 12:26 AM (8 years, 7 months ago)

18/6 or 24/0
people will argue one over the other into the ground. just use either. just to defend 24/0 i've used it with great results.


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Invisibleniteowl
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Re: Lighting question. [Re: ecto]
    #4550 - 04/21/08 07:42 AM (8 years, 7 months ago)

Would less than 18 hours be bad for them, say 12-14 hours per day.

Or do I need to stick to 18 hours.

Isn't 12 on and 12 off used for the fruiting stage of growth?

Looks like I may need to buy a light timer.


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-


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Offlineerb
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Re: Lighting question. [Re: niteowl]
    #4580 - 04/21/08 08:41 AM (8 years, 7 months ago)

24 hours in veg stage for max growth.
marijuana doesn't need a dark period to rest.

switch to 12/12 when ready to flower


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OfflineSirius
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Re: Lighting question. [Re: erb]
    #4640 - 04/21/08 09:19 AM (8 years, 7 months ago)

Quote:

erb said:
24 hours in veg stage for max growth.
marijuana doesn't need a dark period to rest.




This is what I had been reading. It said as much in the comprehensive guide on the main site too.


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Offlineerb
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Re: Lighting question. [Re: Sirius]
    #4746 - 04/21/08 10:42 AM (8 years, 7 months ago)

Most green plants are classified as either C3 or C4 which represents how carbon(C) is used during photosynthesis.

C4 plants temporarily store carbon dioxide(CO2) over the dark period to use for photosynthesis during the day. C4 plants slow down photosynthesis once the stored CO2 is used up and they need to gather it from the air. Which is why trees slow down photosynthesis in the afternoon even though the sun is still bright. This does NOT apply to cannabis.

C3 plants(cannabis/veggies) gather CO2 only during the light period when they are photosynthesizing. During the dark period these plants only use oxygen for their metabolic life processes. They don't uptake CO2 , nor do they use it. As soon and as long as the light is on, C3 plants gather and use CO2 for photosynthesis.

C3 plants also have the ability to use higher concentrations of CO2 than what is found in the air. If the light is bright enough and the plants have sufficient nutes, their growth rate will accelerate from it(2000ppm vs. 400ppm of CO2), which increases yield. They can do this continuously, without a dark period throughout the vegetative stage.

The dark reaction is a process of photosynthesis that takes place in both darkness and light. It uses ATP and NADPH molecules that hold energy absorbed from light to break apart CO2 into it's base components.

Again people get anthropomorphic with their plant needs. People need rest, so plants must too. This is false as well. Light means growth. Scientifically. Although 18/6 will shock your plants less when you switch to 12/12, it's a personal choice whether you would rather sacrifice a little growth for a quicker adjustment or less photo confusion. If you want to save money or energy that's a personal choice too. Do what you need to do to make your growing scenario work.

Another factor to consider, your bulb life will be shorter the more you turn it on and off.

Don't confuse internode stretching in the dark cycle with plant growth.
Under 18/6 you may get a taller plant, but the end weight is less than a plant grown under 24 hours of light.
At 18/6 you will save some money on electricity,
but like i said before, 24 hour light means 24 hour growth
as long as the plants other needs are met.

24/0 will always show faster growth
as long as you are providing for the plants other needs.
Marijuana does not need rest.
It does not get tired from to many hours of light.
its keeps on photosynthesizing at the same rate through the entire light cycle.

Although more hours of light does mean higher temp. issues.
I think some people have better luck with 18 hours because of the drop in temps it provides the plants, especially to the root-zone.

Water, CO2 and nutrient requirements are increased under 24/0 .

The daily voltage spike at startup contributes a large portion of the wear on a lighting system.

One week before flowering you can reduce the photo-period to 18/6 to reduce the stress on the plants.
Normally, under ideal conditions you can flower plant about a week earlier when grown under 24/0.

any questions?


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Offlineerb
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Re: Lighting question. *DELETED* [Re: Sirius]
    #4748 - 04/21/08 10:44 AM (8 years, 7 months ago)

Post deleted by erb

Reason for deletion: double



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Invisibleniteowl
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Re: Lighting question. [Re: erb]
    #4763 - 04/21/08 11:01 AM (8 years, 7 months ago)

Double post :shake:


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-


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Offlineerb
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Re: Lighting question. [Re: niteowl]
    #4774 - 04/21/08 11:17 AM (8 years, 7 months ago)


If you had comprehended my post you might have actually appreciated it.
:jointsmile:  :jointsmile:


Edited by erb (04/21/08 11:38 AM)


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Invisibleniteowl
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Re: Lighting question. [Re: erb]
    #4790 - 04/21/08 11:43 AM (8 years, 7 months ago)

I did find your post to be informative, just not the second post :grin:


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-


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Offlineerb
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Re: Lighting question. [Re: niteowl]
    #4795 - 04/21/08 11:48 AM (8 years, 7 months ago)

whatever


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Invisibleniteowl
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Re: Lighting question. [Re: erb]
    #4804 - 04/21/08 12:01 PM (8 years, 7 months ago)

:whatever:


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-


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Offlineerb
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Re: Lighting question. [Re: niteowl]
    #4807 - 04/21/08 12:03 PM (8 years, 7 months ago)

a better approach would have been just to thank me..
are you the double post police or something? :chillpill:


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