GML Accusations..

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Kassiopeija

Kassiopeija

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Rocket Soul said:
The sun has the best emerson effect cause its a gas is non factual and sorry it shows you havent read up what it actually is or when it applies. To be clear: emerson effect is negligble at sun light intensity levels, it is only a thing in low light levels. Again your drinking from the hype coolaid with out going after facts.
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thus, it is important in an artificial light-setup because:
Leaf-Transmittance-1024x446.png
Problem with many studies on photosynthesis rates is they only pluck a single leaf in between the glass and think that's all there is.
And yes, at high PPFD the LHC2 antenna wanders to support PS1 but both - spectrum & radiant flux, changes within a plant.
 
rkymtnman

rkymtnman

Well-Known Member
Gregshed said:
Those charts don't show band gaps just a continuous spectral emission which is not a full picture. Like make peaks join the dots and you get a similar problem describing a technical aspect of light.

It's why leds use luminescent coatings but I have already explained.
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maybe you didn't see the real meaning of that graphic:

it goes from sunlight on the left (best) to hps on the right(worst) spectrum.
 
Gregshed

Gregshed

Well-Known Member
It's one point GML made, even when others said he was wrong on results he simply argued them down and showed his useless data.

RIU seems like that, I have the best plant, this led chart is fuller than this hps chart.
 
Gregshed

Gregshed

Well-Known Member
rkymtnman said:
maybe you didn't see the real meaning of that graphic:

it goes from sunlight on the left (best) to hps on the right(worst) spectrum.
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Again the charts don't show band gaps, even when they improve leds how can they improve what looks to be an already perfect emmision of every wavelength under the sun!

Don't bother I understand a lot of this goes over your heads, those charts were the same before improvements were made which shows there was a serious problem in how they portray light.
 
rkymtnman

rkymtnman

Well-Known Member
Gregshed said:
Again the charts don't show band gaps, even when they improve leds how can they improve what looks to be an already perfect emmision of every wavelength under the sun!

Don't bother I understand a lot of this goes over your heads, those charts were the same before improvements were made which shows there was a serious problem in how they portray light.
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not to brag, but i've grown cannabis under all 5 of those lighting types. plus metal halide. you?
 
grotbags

grotbags

Well-Known Member
Gregshed said:
Shit and there's me thinking you would type up the limitations of luminescent coatings, band gap diagrams on spectral emissions and give some real truths.
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Gregshed said:
Again the charts don't show band gaps, even when they improve leds how can they improve what looks to be an already perfect emmision of every wavelength under the sun!

Don't bother I understand a lot of this goes over your heads, those charts were the same before improvements were made which shows there was a serious problem in how they portray light.
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greg i dont think you understand what a band gap is.

band gaps in leds are not refering to actual gaps in the light spectrum, they refer to the range in which different underlying led semi conductor material will allow an electron to pass from the conductive band to the valiance band giving of a photon in the process.

different semi conductors have different band gap ranges which in turn give off photons of different wavelenghts.
if you look at the standard white diode its based on a indium gallium nitride semi conductor, for InGaN the band gap generates photons roughly around 450nm (the big blue peak on led spectrum graphs) a phosphor coating then converts some of these blue photons into the other colour wavelengths you see on the spectrum graphs.

there are no gaps...
 
tstick

tstick

Well-Known Member
0potato0 said:
So it's precise information about the product I am buying OR someone being nice to me? why can't it be both?
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I don't know why it wasn't always both. After awhile, I think people started to understand what was a good light or not based on the key components. It wasn't so much that one company had real, distinct, proprietary differences from one to the next....Cree, Samsung, Meanwell...etc. The way that companies started to distinguish themselves was through better customer service.
 
tstick

tstick

Well-Known Member
shnkrmn said:
Eraserhead was his name here. I was an original a51 customer. Still rock my xgs190s. Pretty good sidelights :)
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Oh yeah. I remember that name now. Yeah, I bought one of his lights, too! It STILL works great! Great light....TERRIBLE customer service!
 
NanoGadget

NanoGadget

Well-Known Member
grotbags said:
greg i dont think you understand what a band gap is.

band gaps in leds are not refering to actual gaps in the light spectrum, they refer to the range in which different underlying led semi conductor material will allow an electron to pass from the conductive band to the valiance band giving of a photon in the process.

different semi conductors have different band gap ranges which in turn give off photons of different wavelenghts.
if you look at the standard white diode its based on a indium gallium nitride semi conductor, for InGaN the band gap generates photons roughly around 450nm (the big blue peak on led spectrum graphs) a phosphor coating then converts some of these blue photons into the other colour wavelengths you see on the spectrum graphs.

there are no gaps...
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ding ding ding! we have a winner! I've seen people misunderstanding the concept of band gaps in this way so many times, but I'm not well versed enough in the specifics to communicate it the way you have. Thanks for putting this information out there for myself and others.
 
Gregshed

Gregshed

Well-Known Member
grotbags said:
greg i dont think you understand what a band gap is.

band gaps in leds are not refering to actual gaps in the light spectrum, they refer to the range in which different underlying led semi conductor material will allow an electron to pass from the conductive band to the valiance band giving of a photon in the process.

different semi conductors have different band gap ranges which in turn give off photons of different wavelenghts.
if you look at the standard white diode its based on a indium gallium nitride semi conductor, for InGaN the band gap generates photons roughly around 450nm (the big blue peak on led spectrum graphs) a phosphor coating then converts some of these blue photons into the other colour wavelengths you see on the spectrum graphs.

there are no gaps...
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The spectrum graphs indicate no gaps, put all the bands and luminescent coatings and there are gaps. I've said every way possible for you to work this out.

Let's back to those graphs, the sun's spectrum has lots of tiny gaps if we look on a spectrograph, do your now saying LEDs have more wavelengths than the sun.

Either way you want to put it you come out wrong, were not talking peaks and troughs just electromagnetic wavelengths, come on how have you made a light with more wavelengths than the sun!
 
PJ Diaz

PJ Diaz

Well-Known Member
Gregshed said:
The spectrum graphs indicate no gaps, put all the bands and luminescent coatings and there are gaps. I've said every way possible for you to work this out.

Let's back to those graphs, the sun's spectrum has lots of tiny gaps if we look on a spectrograph, do your now saying LEDs have more wavelengths than the sun.

Either way you want to put it you come out wrong, were not talking peaks and troughs just electromagnetic wavelengths, come on how have you made a light with more wavelengths than the sun!
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Do you have evidence to support your assertions, outside of a manufacture's claims?
 
Grow Lights Australia

Grow Lights Australia

Well-Known Member
Gregshed said:
The spectrum graphs indicate no gaps, put all the bands and luminescent coatings and there are gaps. I've said every way possible for you to work this out.

Let's back to those graphs, the sun's spectrum has lots of tiny gaps if we look on a spectrograph, do your now saying LEDs have more wavelengths than the sun.

Either way you want to put it you come out wrong, were not talking peaks and troughs just electromagnetic wavelengths, come on how have you made a light with more wavelengths than the sun!
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I don't wish to cause an argument but I am confused by what you mean as "gaps" in LED spectra. We use a Danish Viso Systems LabSpion Goniometer to measure our lights and this system is regarded as not only one of the most accurate light measuring devices on the market but it measures every single nanometer. If you look at the exploded view of the report below you will see all the little jagged peaks where each nm has been measured. You may be correct that each nm is then blended but how big a gap are we talking? I am very interested to know this.

I have included a typical hand-held spectrometer reading of the same spectrum for reference. It is a Lighting Passport that measures every 8nm and you are correct that it "blends" the spectra which is why the two measurements look different even though they are the same light.

I apologise, I uploaded the incorrect files at first. I have fixed it now.

Goniometer
Screen Shot 2022-03-15 at 1.03.27 pm.png

Screen Shot 2022-03-15 at 1.02.48 pm.png


Lighting Passport
Screen Shot 2021-08-26 at 11.46.43 pm.png
 
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