researching
Well-Known Member
Do you not have a sense of humor? Why be so literal!?
why dont we collectively throw down for sphere data?
- Thread starter CobKits
- Start date
CryBby247
Active Member
I just take it as I see it maybe you should be more clear roflDo you not have a sense of humor? Why be so literal!?
researching
Well-Known Member
Thanks for proving my point.
ichabod crane
Well-Known Member
Qjay420
Well-Known Member
ya I call him the dream crusher .
CryBby247
Active Member
Point that your dancing?
Qjay420
Well-Known Member
I don't want the LED section to be a problem. Anyone with the heart , Willing to build very expensive lights on other peoples Knowledge are very passionate about this and probably did it because they themselves wanted a better grow light. I am very sorry myself for letting people get to me , like I said the passion runs deap . it's to bad because people really wanted to learn but people started trolling and making others question good and valuable information and that's to bad for the DIY GUYS. but good for you other guys looking to make money because DIY has come and gone already, and only the cream shall rise to the top.
PhotonFUD
Well-Known Member
Apparently so good that I don't even know that I am doing it.
Merit should be based on the content, not the contributor.
PhotonFUD
Well-Known Member
The majority are often wrong.
JorgeGonzales
Well-Known Member
See what I mean? I am envious.
researching
Well-Known Member
The led forum has lots of great info in it and honestly every other forum category you choose has very opinionated people. I am opinionated, but realize there is more than one way to skin a cat. If it works, it works.
The people that demean, or talk shit because their way is the best, must have low self esteem and or a small penis. I could care less how people get to the finish line as long as they get there. If they get there without an attitude and have something to share along the way, all the better.
I have learned a lot from the led forum and youtube regarding leds and more specifically diy.
The people that demean, or talk shit because their way is the best, must have low self esteem and or a small penis. I could care less how people get to the finish line as long as they get there. If they get there without an attitude and have something to share along the way, all the better.
I have learned a lot from the led forum and youtube regarding leds and more specifically diy.
PhotonFUD
Well-Known Member
Totally agree and I will refrain from further posting anything off topic in this thread.
My apologies for previous posts, I have just been going through them in order.
Now to contribute. Physics department at local university. Anyone try yet?
PhotonFUD
Well-Known Member
Why dont you just paint the inside of a basketball white,make a trap door and mount your li cor inside it lmao.see i just saved you 3 to 4 k,thank me laterz
While I see your point on trying to get a DIY option going, the big expensive part of the scientific devices is the testing and certification gone into them. Manufacturing the sphere is a relatively small portion and calibration can be another large cost as it is largely a manual process. Being something that will be used for measuring, it has to be accurate.
There is some fun in the DIY idea generation department so here is my contribution and to give credit to Abiqua as it is somewhat based on his idea. Instead of going a sphere, why not use a sensor directly in contact with the emitting surface? The goal is to collect all the photons emitted from source, that is what the sphere does. If you have a sensor able to effectively grab all the photons that would accomplish the same thing.
Abiqua suggested 'reverse running' an led (I might be off on this, don't hold me to it, correction required) to pick up the current flow generated by photons absorbed by the led. I thought there would be too many losses if it was even possible to work, but the idea is the same for quantum sensors so it works with whatever material gives the sensitivity we can use to measure. For all we know there might be something cheap out there that can do it for us. Something to look into next week.
But we will still run into the problem of calibration. We would all need a common source to calibrate each of our devices to regardless of what/how they were made. That will be the tricky part.
PhotonFUD
Well-Known Member
You should be complaining to Citizen, Cree and other emitter manufacturers to do it for you
PhotonFUD
Well-Known Member
To put an end to this right here and now, no he is not me. Furthermore, I have nothing to do with him, no business association or otherwise.
I have no problem calling out garbage regardless of who it is. To me, you are all just random people on the internet like I am. It makes not what you think about me. As I have said all along, you are free to believe in what you want.
JorgeGonzales
Well-Known Member
Uh...You should be complaining to Citizen, Cree and other emitter manufacturers to do it for you
Abiqua
Well-Known Member
http://www.analog.com/library/analogdialogue/archives/48-08/raq_108.html
...
At about 2¢ each in large quantities, LEDs cost about five times as much as diodes, but they are much more sensitive as photocells. With the sun falling directly on it, the photocurrent of a red 5-mm LED (1000 mCd @ 20 mA) is over 20 μA; in the sunny tropics this might keep a clock battery charged. They’re not well-suited for power generation, but LEDs are convenient photodetectors at about 10% of the price of purpose-made ones.
An LED’s spectral sensitivity depends on its color: they sense wavelengths shorter than or equal to their own emitted wavelength. This depends on the properties of the encapsulation; light from colors that it absorbs will not reach the LED. White LEDs contain a phosphor to convert monochrome light to white light and do not make good photocells.
Manufacturers do not characterize LEDs as photocells, so minor design changes that have minimal effect on their behavior as LEDs may cause major changes in their characteristics as photocells. When using LEDs as photocells, characterize them yourself, and use conservative designs so that your circuit still performs well with any changes. This makes mass-produced circuits using LEDs as photocells demanding, but they are very useful in small batch or single system designs.
An elegant application is where an LED is driven by an analog microcontroller. The same LED may be used as a photodetector by disabling the digital output driving it and sensing its photocurrent output. If the microcontroller has dual-purpose analog input/digital I/O pins, like the ADuC7023 or the Atmel ATMega controllers used in Arduinos, this can be done with an LED and two resistors—and just one processor pin. {yes, even the Arduino Micro with a non removable chipset i.e cheap, will run this type of circuit}
A semiconductor diode can be connected as a photocell in two ways: photovoltaic mode and photoconductive mode.{this is Reverse Biasing of the P/N junction at work] Solar panels work in photovoltaic mode; light shines on them, the anode becomes more positive than the cathode, and a current proportional to the incident light flows in any circuit connected between the anode and the cathode. The diode is forward biased and its capacitance is several times larger than its reverse-biased capacitance.
In photoconductive mode, light shining on a reverse-biased photodiode causes a photocurrent proportional to the incident light to flow. It is best to use photoconductive mode for ac signals as the frequency response is better, but light measurement in photovoltaic mode is very simple, as shown inPhotodiodes and Other Light Sensors.
qualitative vs quantitative....at the current pace which rules?, that's the more likely question
...
At about 2¢ each in large quantities, LEDs cost about five times as much as diodes, but they are much more sensitive as photocells. With the sun falling directly on it, the photocurrent of a red 5-mm LED (1000 mCd @ 20 mA) is over 20 μA; in the sunny tropics this might keep a clock battery charged. They’re not well-suited for power generation, but LEDs are convenient photodetectors at about 10% of the price of purpose-made ones.
An LED’s spectral sensitivity depends on its color: they sense wavelengths shorter than or equal to their own emitted wavelength. This depends on the properties of the encapsulation; light from colors that it absorbs will not reach the LED. White LEDs contain a phosphor to convert monochrome light to white light and do not make good photocells.
Manufacturers do not characterize LEDs as photocells, so minor design changes that have minimal effect on their behavior as LEDs may cause major changes in their characteristics as photocells. When using LEDs as photocells, characterize them yourself, and use conservative designs so that your circuit still performs well with any changes. This makes mass-produced circuits using LEDs as photocells demanding, but they are very useful in small batch or single system designs.
An elegant application is where an LED is driven by an analog microcontroller. The same LED may be used as a photodetector by disabling the digital output driving it and sensing its photocurrent output. If the microcontroller has dual-purpose analog input/digital I/O pins, like the ADuC7023 or the Atmel ATMega controllers used in Arduinos, this can be done with an LED and two resistors—and just one processor pin. {yes, even the Arduino Micro with a non removable chipset i.e cheap, will run this type of circuit}
A semiconductor diode can be connected as a photocell in two ways: photovoltaic mode and photoconductive mode.{this is Reverse Biasing of the P/N junction at work] Solar panels work in photovoltaic mode; light shines on them, the anode becomes more positive than the cathode, and a current proportional to the incident light flows in any circuit connected between the anode and the cathode. The diode is forward biased and its capacitance is several times larger than its reverse-biased capacitance.
In photoconductive mode, light shining on a reverse-biased photodiode causes a photocurrent proportional to the incident light to flow. It is best to use photoconductive mode for ac signals as the frequency response is better, but light measurement in photovoltaic mode is very simple, as shown inPhotodiodes and Other Light Sensors.
qualitative vs quantitative....at the current pace which rules?, that's the more likely question
CobKits
Well-Known Member
i think the idea is that although lamps are similar in direction, there may be slight differences. im not expecting much relative difference vs the 12" on axis measurements i take, but technically its correct.
once you get past bare chip its useful. for example a BJB acts as a mini reflector and can skew data. in a sphere this should theoretically account for itself
CobKits
Well-Known Member
PSU i accept your apology, thank you.
im here to learn and teach and have fun, not to be a dick and/or fuck with people IRL
CobKits
Well-Known Member
s
someone like yourself with great skills would be good for that. if you got the space i got the chips. it doesnt need to be a commercial for citi or whatever. id personally like to see good consistent sided by sides of stuff like 80 vs 90 cri etc. most spectrums are similar from mfr to mfr anyway.