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OfflineLogicaL ChaosM
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Budding Question: Can u force flower with color temp?
    #22332816 - 10/04/15 01:47 PM (8 years, 3 months ago)

Hey guys,

So i currently have a weed plant growings. Its no where near ready for flowering, but it  will be someday.

So right now its outside, getting sunlight, but at night, i have outdoor lights that turn on automatically when its too dark. So its practically getting 24 hours of light.

Lets say i wanted to start flowering,  could i override the 24-hour vegging light cycle by putting a red-spectrum lamp near the plant at night to start flowering?

I know i can just move the plant from away from the outdoor exterior light, im asking this out of pure curiosity...


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Offlineinvitro

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Re: Budding Question: Can u force flower with color temp? [Re: LogicaL Chaos]
    #22333240 - 10/04/15 03:22 PM (8 years, 3 months ago)

I'm not really sure what you mean by over-ride?  You mean you want to run a regular light and a red spectrum at the same time in hopes of triggering flowers?  If that's what your driving at the answer is no, you will not trigger flowering. 

If you don't understand what phytochrome is, researching that is a good place to start.


Edited by invitro (10/04/15 03:27 PM)


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Offlinepsillyboy
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Re: Budding Question: Can u force flower with color temp? [Re: LogicaL Chaos] * 1
    #22334184 - 10/04/15 07:01 PM (8 years, 3 months ago)

You force budding by reducing the light to 12 hours per day and plant will flower. The color of the light will not affect when the plant flowers.


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Offlineinvitro

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Re: Budding Question: Can u force flower with color temp? [Re: psillyboy]
    #22334206 - 10/04/15 07:04 PM (8 years, 3 months ago)

Not entirely true, certain wavelengths of light can convert the phytochrome, causing the plant to think it's in 12/12 when it's really not, causing it to flower.


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InvisibleZombi3
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Re: Budding Question: Can u force flower with color temp? [Re: invitro]
    #22334296 - 10/04/15 07:23 PM (8 years, 3 months ago)

Quote:

invitro said:
Not entirely true, certain wavelengths of light can convert the phytochrome, causing the plant to think it's in 12/12 when it's really not, causing it to flower.



Link?

@LogicaL, as far as I know cannabis is an obligate short day flowering plant. This means no matter the spectrum given, it will only flower when the days shorten to 12 hours or less of light.

If a simple light spectrum change could cause a cannabis plant to flower while receiving a long day (18+ hours) of light then it would be classified as a facultative short day plant.

Cannabis sativa = obligate short day flowering.
Cannabis indica = obligate short day flowering.
Cannabis ruderalis = facultative short day flowering.


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Offlineinvitro

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Re: Budding Question: Can u force flower with color temp? [Re: Zombi3]
    #22334337 - 10/04/15 07:30 PM (8 years, 3 months ago)

If you read abt phytochrome you should be able to figure it out... active/inactive and how they convert.


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InvisibleZombi3
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Re: Budding Question: Can u force flower with color temp? [Re: invitro]
    #22334405 - 10/04/15 07:45 PM (8 years, 3 months ago)

If you could flower a cannabis plant on 18/6 or more simply by changing the light spectrum then why isn't everybody doing it to increase yield?

What nanometer range of light spectrums would one need to give a cannabis plant in order to see it flower in a 18/6 photoperiod?


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OfflineLogicaL ChaosM
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Re: Budding Question: Can u force flower with color temp? [Re: Zombi3]
    #22334420 - 10/04/15 07:47 PM (8 years, 3 months ago)

Has any experimental growing been done on the subject?

Should i be the first to try and see if it works? :strokebeard:


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InvisibleZombi3
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Re: Budding Question: Can u force flower with color temp? [Re: LogicaL Chaos]
    #22334445 - 10/04/15 07:52 PM (8 years, 3 months ago)

From my cursory Google search it appears that flashing red light during the dark period will afford you an extra 2 hours of light during the light period and still get an optimal flowering. This means you could flower in 14 hours of light the same you could flower in 12 hours of light. However 14 hours is still a short day so really all this does is afford you a measly 2 extra hours which may translate to a small increase in yield. But it's not the same as force flowering a short day plant in a long day photoperiod by controlling light spectrums.


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Offlineinvitro

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Re: Budding Question: Can u force flower with color temp? [Re: Zombi3]
    #22334618 - 10/04/15 08:30 PM (8 years, 3 months ago)

I guess it depends on how you look at it.  2 extra hours is a 16% increase in the amount of light you can use during flowering.

Does 16% more yield sound like a good deal? 

:shrug:


Edited by invitro (10/04/15 08:34 PM)


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InvisibleZombi3
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Re: Budding Question: Can u force flower with color temp? [Re: invitro]
    #22336004 - 10/05/15 08:22 AM (8 years, 3 months ago)

A %16 increase in light does not guarantee a %16 increase in yield lol


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OfflineMatt87
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Re: Budding Question: Can u force flower with color temp? [Re: Zombi3]
    #22336019 - 10/05/15 08:30 AM (8 years, 3 months ago)

I bet you can flower in 24 hours light. 12 green light then 12 red.


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InvisibleZombi3
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Re: Budding Question: Can u force flower with color temp? [Re: Matt87]
    #22336031 - 10/05/15 08:33 AM (8 years, 3 months ago)

:lol: yes that would work but it's a total waste of electricity and won't make a difference in the end lol


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OfflineMatt87
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Re: Budding Question: Can u force flower with color temp? [Re: Matt87]
    #22336033 - 10/05/15 08:33 AM (8 years, 3 months ago)

You can flower with 14 hours of light anyways, it just takes longer. I used to go 12/12 for 3 or 4 weeks then increase the time once they were fully transitioned into flowering. I used to experiment a lot.


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OfflineMatt87
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Re: Budding Question: Can u force flower with color temp? [Re: Zombi3]
    #22336041 - 10/05/15 08:36 AM (8 years, 3 months ago)

Quote:

Zombi3 said:
:lol: yes that would work but it's a total waste of electricity and won't make a difference in the end lol



Oh yeah, it's dumb for sure.


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InvisibleZombi3
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Re: Budding Question: Can u force flower with color temp? [Re: Matt87]
    #22336051 - 10/05/15 08:38 AM (8 years, 3 months ago)

Yes but 14 hours is still a short day photoperiod, I'm not surprised that works.
This started because someone said you can flower in a long day photoperiod which is 16+ hours a day simply by changing the light spectrum, which is false.
Cannabis is a short day photoperiodic response plant, that's just a fact.


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OfflineMatt87
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Re: Budding Question: Can u force flower with color temp? [Re: Zombi3]
    #22336156 - 10/05/15 09:05 AM (8 years, 3 months ago)

Yeeeeeaah booooooyyyy! That's what flavor flav would say about it anyhow.


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InvisibleballsalsaMDiscord
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Re: Budding Question: Can u force flower with color temp? [Re: Zombi3]
    #22336212 - 10/05/15 09:21 AM (8 years, 3 months ago)

Quote:

Zombi3 said:
Yes but 14 hours is still a short day photoperiod, I'm not surprised that works.
This started because someone said you can flower in a long day photoperiod which is 16+ hours a day simply by changing the light spectrum, which is false.
Cannabis is a short day photoperiodic response plant, that's just a fact.




the plant uses red spectrum light to determine day length.  this is why weed flowers outdoors even though it get moon and star light at night.  even just a momentary flash of red spectrum resets the plant's internal clock. thus, you could blast them with blue spectrum light all night long, and the plant will still think it is night.


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InvisibleEl Torcho
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Re: Budding Question: Can u force flower with color temp? [Re: ballsalsa]
    #22336532 - 10/05/15 11:30 AM (8 years, 3 months ago)

:mygoditsfullofstars:


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InvisibleZombi3
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Re: Budding Question: Can u force flower with color temp? [Re: ballsalsa]
    #22336704 - 10/05/15 12:13 PM (8 years, 3 months ago)

Quote:

ballsalsa said:
Quote:

Zombi3 said:
Yes but 14 hours is still a short day photoperiod, I'm not surprised that works.
This started because someone said you can flower in a long day photoperiod which is 16+ hours a day simply by changing the light spectrum, which is false.
Cannabis is a short day photoperiodic response plant, that's just a fact.




the plant uses red spectrum light to determine day length.  this is why weed flowers outdoors even though it get moon and star light at night.  even just a momentary flash of red spectrum resets the plant's internal clock. thus, you could blast them with blue spectrum light all night long, and the plant will still think it is night.



False.

What you're essentially sayin is someone could keep their MH (blue spectrum) lights on all night long as well as all day for the regular day cycle, and they plant will still flower as long as you flash red spectrum during the night cycle.

That simply will not work.

You can even flower a plant with zero red spectrum, using only blue spectrum, as long as it gets less than 14-15 hours of light in a day. This is because it is a SHORT DAY PHOTOPERIODIC FLOWERING PLANT.

Light spectrum alone can not cause a cannabis plant to flower.
Photoperiod alone can cause a cannabis plant to flower.
Photoperiod + red spectrum will cause a cannabis plant to flower fastest.


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