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Registered: 04/20/08
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LED Color Configurations
    #302646 - 10/23/09 07:52 PM (9 years, 9 months ago)

Has anyone done any research into if various color configurations are better for different stages of growth (i.e seedling, vegetative, flowering etc).. similar to HID lights where it is generally accepted? that metal halide are better for vegetative because of the blue spectrum and HPS for flowering, although each can be used fine on their own.. if we are talking optimum lighting.

Looking at various 300-600 watt LED units the general config seems to be a 7:1:1 red blue orange ratio or 8:1 red blue.. is there an advantage to using a tri-band or quad-band over the standard red and blue spectrums or what?

Edited by Shroomism (10/23/09 07:53 PM)

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Re: LED Color Configurations [Re: Shroomism]
    #309825 - 11/04/09 05:34 PM (9 years, 9 months ago)


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Re: LED Color Configurations [Re: Shroomism]
    #309843 - 11/04/09 06:19 PM (9 years, 9 months ago)

Hmm. Simple question but hard to explain.
Simply put violet-blue and red spectrum are the ones to be used.(obviously I know)
But to answer the question you have to know what processes are going on and you can completely understand it's simpler than some might think.

Here's this to start off. Shows a classic experiment done that shows how they determined what spectrum plants use.
Long story short during photosynthesis plants release O2.
They shined light through a prism and measured the amount of O2 released in each spectrum.
The spectrum with the most oxygen loving microbes showed that was what spectrum's the plant was using.

That's the simple answer. It gets much more complicated when tracing the processes.
I'm not going to get into it it, I'll just shortand what I remember.

Chlorophyll A and B are almost identical in their  function.
The only difference is the chemical structure in once simple instance.
They do the same thing except they absorb slightly different levels of light.

THerefor chlorophyll a and b are equally important when concerning the plant.

Chlorophy is essentially light harvesters.

Why in a perfect setup whould you only supply blue or only supply red?
You shouldn't in a perfect setup.
Why eliminate one of the plants processes.

Then there's carotenoids. Think of it like healthfood for a plant.
Extra pigment to help block out bad sunrays. Antioxidants and stuff.

You might already know this and realize this really offtracked from the main post.
Anyways when you ask whats better I think It breaks down to what do you plan to accomplish.

Red spectrum is supposed to promote node sites. Also plants stretch to receive it.
Therefor more red light = more nodes tightly spaced.

Blue spectrum promotes production of all 3 chloroplasts pigments.

You decide what you think is better.

I'm done blabbing. It gets really interesting if you dive deeper into the biology.

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CNC Machinist/Greenthumb
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Re: LED Color Configurations [Re: DoPeYsMuRf]
    #309917 - 11/04/09 08:58 PM (9 years, 9 months ago)

Awesome post Dopey!

That's some great information right there.

You should add that to the main page!

I actually learned something today yay!

Don't criticize what you can't understand

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Captain Canada

Registered: 10/14/09
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Re: LED Color Configurations [Re: Inverted]
    #309979 - 11/04/09 10:37 PM (9 years, 9 months ago)

One thing to say for sure about growing in a largely blue spectrum like 6500K for the first 5 or 6 nodes of growth, you severly reduce the stretch and gain tight nodes, a short and bushy plant.  I think it does wonders for the future of the plant to receive that largely blue spectrum early on for that reason.

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InvisibleDr. Penguin
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Registered: 05/19/08
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Re: LED Color Configurations [Re: Azyle00]
    #310150 - 11/05/09 09:02 AM (9 years, 9 months ago)

What book is that Dopey? It looks pretty good, it seems like all my textbooks are just that, text.

* My Cab
* How to Build a Grow Tent
* Fan Speed Control 101
* Easy Butane Extraction

Not responsible for advice not taken.

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That Guy

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Registered: 08/12/08
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Re: LED Color Configurations [Re: Dr. Penguin]
    #310623 - 11/05/09 10:03 PM (9 years, 9 months ago)

well...i know that phytochromes come in two types, red light absorbing (Pr), and far-red light absorbing (Pfr).

These two phytochromes are interchangeable...in that when on absorbs light they change into the other form. So if a Pr absorbs red light, it will convert to Pfr form, and vice versa.

The Pr version absorbs red light at 660nm, which is about the same as the peak activity in the red spectrum for chlorophyll, and about what is used in the red LED that they put in LED growlights.

During exposure to sunlight, the ratio of red light to far red light is about 1.2:1 and there are more Pfr phytochromes than Pr. During sunset there is more far red than red light, and therefore more Pr than Pfr. This along with a drop of conversions due to less light exposure during the day is what initiates flowering.

So it seems that switching from a full red-blue spectrum during vegetative growth to a more complete spectrum or something that includes far red light would result in more Pr phytochromes during the flowering cycle, thereby increasing the flowering response in the plant.

Of course, red light has been shown to increase germination in seeds, and exposure to far red light is shown to inhibit germination. Just some extra info...

Hope this provokes discussion,

“The Universe is under no obligation to make sense to you” -NDT

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