Post About Wasteful Spectrum in LEDs

[saltyfilmfolks]

Saw a chart of their "PAR" sensor implementation.. Sensitivity looks almost identical to "old" Apogee..

Therefore weak in UV.. weak after about 650nm..
Same little "jump" at 640-ish..
Look like they modeled it on the Apogee filter pack. if not close to identical..

There spectrum sensor (they claim more than one and patents imply its more than possible) is an interpolation from a RGB array.

http://www.google.com.pg/patents/US20140134052

Whoa , thanks for that link!

 

[Dana Riddle]

The Seneye reported color temperature above its range in all of the preprogrammed settings on the Kessil AP700.

 

[saltyfilmfolks]

The Seneye reported color temperature above its range in all of the preprogrammed settings on the Kessil AP700.

I'm pretty 99% sure it's because of this.

The pain in the meter for me , is the blue ratio in the mixes are hard spiked so it overloads the B sensor a bit and the the averaging algorithm can't compensate for a reading. (Error messaging)
It's one reason you can't take blue pictures well , Esp on a phone

I can color meter a raduim bulb , I can take pictures and movies at 27k (metered) outside in a valley w no direct sun , but can't meter a 14k native led.

 

[Dana Riddle]

Saw a chart of their "PAR" sensor implementation.. Sensitivity looks almost identical to "old" Apogee..

Therefore weak in UV.. weak after about 650nm..
Same little "jump" at 640-ish..
Look like they modeled it on the Apogee filter pack. if not close to identical..

There spectrum sensor (they claim more than one and patents imply its more than possible) is an interpolation from a RGB array.

http://www.google.com.pg/patents/US20140134052

I admit I didn't read the whole patent claim, but isn't this the patent on the ammonia sensor?

 

[oreo54]

I admit I didn't read the whole patent claim, but isn't this the patent on the ammonia sensor?

Well.. it's the explanation of the whole "concept".. including light paths, sensor, and possible filtering..

No, there is no direct mention of how they impliment PAR ect.. but it's left "open"

In embodiments, the two or more sensors are supported on a removable substrate, which enables the sensors to be changed or replaced relatively easily. In embodiments, each of the two or more sensors are configured to detect one or more of pH, ammonia (NH3), Oxygen, Carbon Monoxide, Humity or temperature. Although other chemicals or parameters may be possible.

 

[oreo54]

Whoa , thanks for that link!

 

[saltyfilmfolks]

Yup. We could compare that to a CCD or film.

 

[Velcro]

 

[Tristren]

Yup. We could compare that to a CCD or film.

Great!
What's that mean?

 

[madweazl]

Great!
What's that mean?

CCD is what captures the image on a digital camera (like film for an SLR).

 

[saltyfilmfolks]

Great!
What's that mean?

CCD is what captures the image on a digital camera (like film for an SLR).

And each has a set sensitivity to each of the larger groups of colors in the spectrum.
R G B. Film has three layers of chemicals , CC'd are inividual or combined , and Bayer are combined.

 

[Tristren]

And each has a set sensitivity to each of the larger groups of colors in the spectrum.
R G B. Film has three layers of chemicals , CC'd are inividual or combined , and Bayer are combined.

Ah, ok, so this will allow you to better interpret readings from a Seneye and "translate" them into what you would use to meter for taking a picture (on film or digital)?

That in turn will allow for more useful information regarding the areas of the spectrum beyond what has been the focus of marine aquarium equipment?

In addition to being useful for aquarium photography?

 

[madweazl]

Ah, ok, so this will allow you to better interpret readings from a Seneye and "translate" them into what you would use to meter for taking a picture (on film or digital)?

That in turn will allow for more useful information regarding the areas of the spectrum beyond what has been the focus of marine aquarium equipment?

In addition to being useful for aquarium photography?

It wont provide data better than the tools made for the job but it should provide information that is more easily digestible by common folk like me (as opposed to the likes of Mr. Riddle).

 

[saltyfilmfolks]

Ah, ok, so this will allow you to better interpret readings from a Seneye and "translate" them into what you would use to meter for taking a picture (on film or digital)?

That in turn will allow for more useful information regarding the areas of the spectrum beyond what has been the focus of marine aquarium equipment?

In addition to being useful for aquarium photography?

All visible light is the same , how it's used is just slightly different.
So it's all application.

Mixing the correct amouts creates different colors , for coral, we choose those amounts and colors for the coral.

I use a very broad and expensive set of tools to accomplish a similar thing for motion pictures.

I just happen to have cameras and corals.

 

[saltyfilmfolks]

It wont provide data better than the tools made for the job but it should provide information that is more easily digestible by common folk like me (as opposed to the likes of Mr. Riddle).

A spectrometer can give me useful information about a light for corals and photography.
Once you know what the coral needs you can use that info. Same with cameras.

We don't have par meter though in cameras , we have a histogram.

 

[oreo54]

We don't have par meter though in cameras , we have a histogram.

Matter of software.... you actually have PAR meter (or LUX) but no easy means of quantifying it..
you can digitize both wavelength and intensity and spit out a PAR value..
Technically all the data is already there..
Matter of fact it would be fairly easy to "compile" a PAR value from a (RAW) histogram..easy as in the right geniuses..
WAY above my pay grade though..


Most sensors have the usual RGBG array and a High pass and low pass cutoff filter..
In photography the change in sensitivity /wavelengths is corrected by correction factors ie. see Uniwb for Nikon..
http://www.dslrbodies.com/cameras/camera-faq/what-is-uniwb.html

In PAR meters it is corrected by filters for the most part..

Of course the more one specializes the more you eliminate compromises..

There is no really good compromise for a spectro-photometer w/ out a diffraction gradient or prism and a linear CMOS array..

The ironic thing, in a sense, is that the Seneye w/ multiple sources of errors generally cancel out in the end..

 

[Bronx19]

I've always considered LEDs to be stripped spectrum as is, let alone carry anymore unnecessary.

 

[Hans-Werner]

Are you thinking we're lacking (enough) 700nm Red to keep the two systems active/balanced under some circumstances? (Interesting idea, if so.)

Sorry for going back so far. No, the Emerson Effect is only noticable if you use only these specific wavelength. It only describes how it was discovered that there are two photosystems. As soon as there are wavelengthes that both photosystems absorb like for example blue light the Emerson Effect will disappear or be quite weak.

The antennae of brown colored algae look quite different from that of green algae by having mainly carotenoids as antenna pigments. The photosynthethic apparatus of dinoflagellates (the zooxanthellae are dinoflagellates) consists of 600 chlorophyll a, 354 chlorophyll c and 750 peridinin molecules in Gonyaulax and of 600 chl a, 378 chl c and 1200 peridinin molecules in Glenodinium. The carotenoids make the zooxanthellae appear brown and not green.

My book says that the antennae with the carotenoids deliver their energy mainly to photosystem II. It says blue light is mainly photosystem II light. So red light would mainly benefit photosystem I which gets its energy mainly from chlorophyll a.