certain color leds on during dark cycle?

G

green4me2

Member
Has anyone experimented with certain colors of leds (yellow, amber, orange, blue) on during the lights off portion of flowering? I have read that 660nm and 730nm are what primarily effects phototropism and the conversion of pr/pfr. So I guess in my head it leaves the curiosity of what would happen if other colors were left on during the dark cycle that dont output those wavelengths?

I have read in a couple other threads that people played around with leaving blue leds on and it caused plants to hermie. Is this 100% confirmed?

With the recent success of using white leds for growing i wonder if yellow or amber leds would allow photosynthesis to continue while the lights are off, but not disrupt flowering?

If anyone has any actual first hand experience with this please chime in!
 
dbkick

dbkick

Well-Known Member
I don't think I can post links so google this ......GREEN AND BLUE LIGHT AT NIGHT rosenthal
first match.
 
Endur0xX

Endur0xX

Well-Known Member
green4me2 said:
Has anyone experimented with certain colors of leds (yellow, amber, orange, blue) on during the lights off portion of flowering? I have read that 660nm and 730nm are what primarily effects phototropism and the conversion of pr/pfr. So I guess in my head it leaves the curiosity of what would happen if other colors were left on during the dark cycle that dont output those wavelengths?

I have read in a couple other threads that people played around with leaving blue leds on and it caused plants to hermie. Is this 100% confirmed?

With the recent success of using white leds for growing i wonder if yellow or amber leds would allow photosynthesis to continue while the lights are off, but not disrupt flowering?

If anyone has any actual first hand experience with this please chime in!
Click to expand...
I have a reptile bulb that is ''moon light'' spectrum, I always regretted buying it because I will never try it, I wouldnt want to risk ruining a whole crop. There are lots of easy ways to improve ones crop and not many people can afford to grow and experiment with stuff that could sacrifice their whole grow.

They sell green LED headlamp to go into your grow room in darkness, simply because green doesnt affect the plants but I can't see it being beneficial either. The only thing that I could see being beneficial is perhaps maybe the moon light but it would be really hard to replicate the cycle and the spectrum too I guess.

EDIT after reading it seems like extending the red light 15 minutes before and after lights on and off might help in some ways

I DONT KNOW WHAT I AM TALKING ABOUT
 
Moon Goblin

Moon Goblin

Active Member
In my opinion, If you are looking to have the plant create "food," during its 12 hours of darkness by photosynthesis, you will interrupt the plants dark-period, and have it be confused- hormonally speaking. I, myself, would only seek a dark-period light for the abillity to see/interact with your plants during its dark-period.

Disclaimer: I don't know nothing
 
G

green4me2

Member
dbkick said:
I don't think I can post links so google this ......GREEN AND BLUE LIGHT AT NIGHT rosenthal
first match.
Click to expand...
Been there, read that. On that site there is no conclusion to his study. Just a hypothesis


Endur0xX said:
I have a reptile bulb that is ''moon light'' spectrum, I always regretted buying it because I will never try it, I wouldnt want to risk ruining a whole crop. There are lots of easy ways to improve ones crop and not many people can afford to grow and experiment with stuff that could sacrifice their whole grow.

They sell green LED headlamp to go into your grow room in darkness, simply because green doesnt affect the plants but I can't see it being beneficial either. The only thing that I could see being beneficial is perhaps maybe the moon light but it would be really hard to replicate the cycle and the spectrum too I guess.
Click to expand...
I am more intrigued by the scientific side of things and experimenting. I am in no way trying to replicate nature, more in a sense trying to understand how the plant functions and attempt to manipulate it to our benefit.

I feel green offers very little energy in photosynthesis. Due to the new trend of white leds this leads me to believe plants are able to use more then just red and blue light for photosynthesis. Red/Deep Red/Far Red are what drive phototropism, this leaves me questioning if non red colors are used can some energy be made during "lights out" with out disrupting the stages of flowering. I would like to hear from others who have actually experimented with blue, yellow, or amber leds during the dark cycle and what there results have been?
 
Moon Goblin

Moon Goblin

Active Member
sounds like ground breaking work. I know... why don't you set up an experiment and document it for us all? Manifest destiny, and become the great person you intrinsically know you are.
 
G

green4me2

Member
Moon Goblin said:
sounds like ground breaking work. I know... why don't you set up an experiment and document it for us all? Manifest destiny, and become the great person you intrinsically know you are.
Click to expand...
I dont think this is considered ground breaking since it has been discussed years ago and im sure someone has tested it. I'm looking for results, if I cant find them it would be cheap and easy experiment to perform so I may give it a go. Although i have to agree with your previous post as i have a feeling it will most likely not work and hormonally interrupt the plants natural cycle.
 
Moon Goblin

Moon Goblin

Active Member
green4me2 said:
They dont rely on pr/pfr conversion to tell the plant when to flower.
Click to expand...
"...It is rarely cultivated for the drug content.".. rimshot (buh dum tish)! Really, it (C. ruderalis) relies on age as apposed to

the photoreceptor (phytochrome Pr/Prf)responsible for flowering in C. Sativa and C. Indica. Phytochrome Pr is "triggered" by

a lack of red light(660nm), or converted from Pfr by Infrared light ( 730nm, also known as far-red light), and is what allows

the plant to be aware of light and dark cycles. Some suggest that if one were to use a short (seconds) burst of far-red light

after the beginning of the dark-cycle, one would be able to shorten the dark-cycle by 2 hours ( the conversion from Pfr to Pr

normally takes about two hours) in a 12/12 scenario- thus effectively quickening maturation, or increasing yield (14/10

light/dark cycle). In other words, the far-red (730nm) light quickens the conversion, from what normally takes two hours, to

almost immediately, allowing one to increase the amount of "lights on" time in a 24 hour period and still have the plant

in "flower".

Other electromagnetic frequencies have been reported to have horticultural uses, as well :
- UV-c ( 240nm) to sterilize harmful air-borne micro organisms (pathogens, molds, viruses)
- UV-b (350nm) to increase THC production
- Pure Blue (400-450nm) will inhibit the Pfr/Pr conversion

Some like to theorize that a pure blue and far-red array will allow a C. Sativa or C. Indica to flower under 24 hours of light-

however, I am unable to find any experiments testing this.

Another visible frequency range implemented in the grow room would be the green one (520-570nm). This is because

whatever frequency is not able to be absorbed will be reflected -hence, why we see the green spectrum when chlorophyll is

absorbing the red spectrum. I have never come across other visible frequencies of the electromagnetic scale effectively

used in horticulture. Here are a few helpful links to further understand this pigment plants use to detect light (phytochrome)


395px-Electromagnetic-Spectrum.pnghttp://plantphys.info/plant_physiology/phytochrome.shtml
 
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