Light Intensity; LED vs HID

doz said:
SO... You have this Kessil H380 (3 of them) and you believe it is too much light? Those things run at 90w.... Thats 270w of light... Most likely, it is not that efficient so the amount of light is not even close to what some people run 12" from their plants.....

Y'all need to get off this too much light shit. And are you flowering? I cant imagine you are due to your humidity levels, at least Id hope not. Whats your fan situation like? A lot of air movement or very little? Possible Magnesium deficiency?
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There are lenses on it that have a very hot center spot. So..... It'll burn pretty easy. Think like a magnifying glass.....
 
I'm aware of the Kessil H380's spectral analysis. My point was that oversaturation of red light can cause photoinhibition i.e. having your Kessil too close to the canopy.

There is also very little (if any) far red wavelengths and this will effect the maximum quantum yield of photosynthesis.

Here is a link with much more detail on the subject...

http://www.sciencedirect.com/science/article/pii/S0005272805001192

disratory said:
http://www.kessil.com/horticulture/downloadfiles/H380vsH350.pdf
The h380 has three settings built into it; off, veg/grow, bloom/flower
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good link but my interpretation might be a bit skewed..

So what they did to provide that far-red was used an incandescent lamp at 716nm and 740nm. And that far red wavelength helps increase the efficiency of photosynthesis or more so it helps the plant use its full potential?

(thought it was strange that they put the discussion section before the conclusions section)
 
disratory said:
So what they did to provide that far-red was used an incandescent lamp at 716nm and 740nm. And that far red wavelength helps increase the efficiency of photosynthesis or more so it helps the plant use its full potential?
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Well they tested wavelengths all the way up to 780nm (with many different instruments), where photosynthesis was no longer stimulated. The far red wavlengths increased the total amount of red wavelengths that could be synthesized. Without far red, photosynthetic efficiency of 650nm wavelength was inhibited by about 25% relatively (from study).

Here is another link with a more simplified explanation of what's going on. It is called the Emerson Effect.

https://en.m.wikipedia.org/wiki/Emerson_effect

disratory said:
(thought it was strange that they put the discussion section before the conclusions section)
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I believe that these studies are mostly all presented in the form of the "scientific method".
Standardized the way we investigate things we don't know :smile:
 
cdgmoney250 said:
I believe that these studies are mostly all presented in the form of the "scientific method".
Standardized the way we investigate things we don't know :smile:
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That would be a pretty good belief lol. I am just used to reading these papers in the order of results conclusions discussion
 
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skunklover1 said:
ok the sun has nothing to do with organics I will agree to disagree.
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I think you are confusing Natural with Organic see below.

The Sun is Natural lighting, but it does not mean it is an Organic light...

Equally LEDs/HIDs are artificial lights but it does not mean they are Inorganic lights...

Photons produced by the Sun and Photons produced by Artificial lighting are all the same photons at the end of the day

Organic is derived from living matter (organic compounds/organic matter)...

For the record the sun is actually comprised of inorganic elements/compounds, so in reality it really does have nothing to do with organics :lol:
 
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