CAN SOME ONE DO A LIGHT METER READING ON LED'S PLEASE?

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johnsmith_559

johnsmith_559

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hello
so I am trying to get some light meter reading in footcandles on a led .
I would like them done at 1 ' intervals up to 4' .
There is a lot made of PAR spectrum but this goes hand in hand with footcandles.
Par is the color or spectrum of the light not the intensity.
PAR would be the ec and ph of the water and FOOTCANDLES is the volume of flow.
Fill a swimming pool with water and focus just on the PAR and you got a wee puddle with excellent water.
Add footcandles and your pool fills up with excellent water and volume .
All lights have a PAR ratio. It is not like s light puts out light with no par .
Once minimum PAR is met it's all about the footcandles.
In the early 90's LOW PRESSURE SODIUM was used in conjunction with Mh with VERY good success .LPS had the most efficient light source .
HPS were about 150/160 lumens per watt .
LPS were closer to 180/200 .
the MH light was able provide par and the LPS provided intensity .
The issue was they were awkward and expensive. HPS were less efficient but also stand alone.
In 1994 there was another NEW source . It was called something similar but I can not remember. something sodium. If you were around then they were in ALL the magazines about how they were revolutionizing the industry. These has a little bulb like an incandescent and they were connected together with a long tube like a fluorescent. They were supposed to put out double the light or more .....never saw one ...they came and went.....
Now LED are the new thing. They definitely have advantages. but I have yet to get a reading on them that I liked. I have read a few small wattage lights and got 3000 fc but only 1' from the bulb. it ran out very fast and was less than 1000 fc at 2' .
Now I have had numerous discussions with people who said PAR would not read in footcandles but that is not true .Any light expert can tell you this .It is not how photon sensors work in light meters .differnt light has different color but they still travel in photons. .
So anyway , long story...I would like a test .
1 foot , 2 foot , 3 foot, arms 4 foot.
a footcandle meter is available free at app store
If you can do this I wound appreciate it .
I am well aware of all aspect and do NOT wish to debate before test is done .
Would like the test and wattage light please.
thank you very much !
 
growsince79

growsince79

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hello
so I am trying to get some light meter reading in footcandles on a led .
I would like them done at 1 ' intervals up to 4' .
There is a lot made of PAR spectrum but this goes hand in hand with footcandles.
Par is the color or spectrum of the light not the intensity.
PAR would be the ec and ph of the water and FOOTCANDLES is the volume of flow.
Fill a swimming pool with water and focus just on the PAR and you got a wee puddle with excellent water.
Add footcandles and your pool fills up with excellent water and volume .
All lights have a PAR ratio. It is not like s light puts out light with no par .
Once minimum PAR is met it's all about the footcandles.
In the early 90's LOW PRESSURE SODIUM was used in conjunction with Mh with VERY good success .LPS had the most efficient light source .
HPS were about 150/160 lumens per watt .
LPS were closer to 180/200 .
the MH light was able provide par and the LPS provided intensity .
The issue was they were awkward and expensive. HPS were less efficient but also stand alone.
In 1994 there was another NEW source . It was called something similar but I can not remember. something sodium. If you were around then they were in ALL the magazines about how they were revolutionizing the industry. These has a little bulb like an incandescent and they were connected together with a long tube like a fluorescent. They were supposed to put out double the light or more .....never saw one ...they came and went.....
Now LED are the new thing. They definitely have advantages. but I have yet to get a reading on them that I liked. I have read a few small wattage lights and got 3000 fc but only 1' from the bulb. it ran out very fast and was less than 1000 fc at 2' .
Now I have had numerous discussions with people who said PAR would not read in footcandles but that is not true .Any light expert can tell you this .It is not how photon sensors work in light meters .differnt light has different color but they still travel in photons. .
So anyway , long story...I would like a test .
1 foot , 2 foot , 3 foot, arms 4 foot.
a footcandle meter is available free at app store
If you can do this I wound appreciate it .
I am well aware of all aspect and do NOT wish to debate before test is done .
Would like the test and wattage light please.
thank you very much !
No need to test at different distances. Test at 1 foot and do the math. A light that's 1000lux @ 1ft is 250 lux @ 2ft.
 
johnsmith_559

johnsmith_559

210
28
No need to test at different distances. Test at 1 foot and do the math. A light that's 1000lux @ 1ft is 250 lux @ 2ft.
[/QUO
I would like the test done . I have been growing 30 years and used to buy light meters in early 90's from EFTON science buy yorkdale
The free app litterly is better than what cost 150$ 25 years ago
there is no reason to do anything other than move the light meter . theoretical math does not always translate perfectly. 10 lux is a foot candle. dont care what setting they have it on . most apps have graphics, graphs, min max...amazing. .
then you can see how the theoretic's hold up . the light I tested went from 3000 to 1000 in less than a foot . I have 600w hps that will go 2000 fc at 5' .
any way , want someone to physically place a light meter under the light please .
 
growsince79

growsince79

5,250
313
Hate to tell you but that theoretical math works better than Chinese light meters. Takes the human error out. A light at 2 ' is 25% as bright as the same light at 1'. At 6" it's 4 times as bright as it is at 1'. Doesn't matter what the light meter says.
 
johnsmith_559

johnsmith_559

210
28
I would like the test done . I have been growing 30 years and used to buy light meters in early 90's from EFTON science buy yorkdale
The free app litterly is better than what cost 150$ 25 years ago
there is no reason to do anything other than move the light meter . theoretical math does not always translate perfectly. 10 lux is a foot candle. dont care what setting they have it on . most apps have graphics, graphs, min max...amazing. .
then you can see how the theoretic's hold up . the light I tested went from 3000 to 1000 in less than a foot . I have 600w hps that will go 2000 fc at 5' .
any way , want someone to physically place a light meter under the light
 
johnsmith_559

johnsmith_559

210
28
Hate to tell you but that theoretical math works better than Chinese light meters. Takes the human error out. A light at 2 ' is 25% as bright as the same light at 1'. At 6" it's 4 times as bright as it is at 1'. Doesn't matter what the light meter says.

or you could just do the test.
this was not a theoretical debate . this is a request to physically take a light meter am put it under the light . it is significantly more effort to do math when you physically have a meter in your hand. you physically have to stop using a meter app to use a calculator app .
this is not unusual. very common .I have poster this on 4 sites and yet to get one person to do it
I have got several hundred neg comments telling me how stupid, misguided , moronic for suggesting it be done .
it is like the actual how much thc is in the bud question ..lots ifbvey heated opinions.
I ownb2 light meters and am app on my phone. you can also build them with about 5$ worth of chips off ebay . a photon sensor and a millivolts chip with your program. the same as ph meter and ec meter. they all work on a electrical signal that originates in millivolts and is read by a program to make a equation that reads in the led screen.
the fact that whatever description you read about what differnce between different scales like EC ppm microsemeins ppm etc it's irrelevant when it comes to a ec meter ss it's all a miiivolt system . no differentiation
same as light meters .lux or fc is just math. your phone has a much better photo sensor than you will find in a actual light meter
 
johnsmith_559

johnsmith_559

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Here's an idea. Do it yourself.
your funny .truth is no on wants it done Because it may shatter their belief in something that may or may not be true.
same as how much thc is in a bud rated at 20% .math says 20g but math is wrong .the bright answer is closer to 2 to 3gram Because the test is done on the secretion oil extracted in the sample processing. the thc content is rated on the trichome oil not the plant matter. so the total thc content can not be more than the resin/trichome content. AMD trichomes are not 100% thc .
I have been banned from 4 sites because of the or 1300 ! negative comments 12 death threats and an address of a guy in northern bc 5o fly out to fight him lol
same on this site...but I decided to just pay for a test and get a report of testing procedures. you provide a sample and I will pay for the test to be done at a lab of our agreement on a hplc chromatograph.. I will even pay for a test on a spectrograph or any other machine of scientific grade.
as i said been on this bus on a commercial level for 30 years. licenced for 10 . I have had several tests done and know the procedure. so just to stop the hate I am paying for a test out of my own pocket. putting my money were my mouth is . I believe I have some one here who is going to do tomorrow. or at least I am calling the labs here in toronto 5o see who is still open. if you are in Ontario I will do the same for you too.
this thread i want a light test done with a meter that reads in FOOTCANDLE or lux that are available free in the app store .
 
Aqua Man

Aqua Man

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This PAR footcandle thing is old and many agree PPFD should and mostly is used when looking for intensity for plants... IMO foot candles should replaced with ppfd. Foot candles like lux/lumen meters do not capture all the photons equally. Green and yellow yes but blue and red not so much. Foot candles is good for measuring light perception for the human eye... not for plants.

Easily seen is take a white full spectrum led and measure ppfd then measure foot candles, probably fairly close conversion. Then do the same with a blurple light... the footcandles will read very low compared to the ppfd because it does not pick up the red and blue accurately.

Just because you don't see photons does not mean they are not there nor that a plants does not use them because they do.
 
johnsmith_559

johnsmith_559

210
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This PAR footcandle thing is old and many agree PPFD should and mostly is used when looking for intensity for plants... IMO foot candles should replaced with ppfd. Foot candles like lux/lumen meters do not capture all the photons equally. Green and yellow yes but blue and red not so much. Foot candles is good for measuring light perception for the human eye... not for plants.

Easily seen is take a white full spectrum led and measure ppfd then measure foot candles. Then do the same with a blurple light... the footcandles will read very low compared to the ppfd because it does not pick up the red and blue accurately.

Just because you don't see photons does not mean they are not there nor that a plants does not use them because they do.
well as I said I do not agree on the basis this is all light manufacturer propaganda.
1) light meters do not do anything other than photon readers in volume
so it is irrelevant what scale as it reads all scales in millivolt signals .
2) PAR or any other description of color or spectrum is not the same as photons read as fc or lux . we little led on a shelf has excellent par but is going to do shit for your large plant . the intensity of photons is what transforms into mass .
THE LAW OF CONSERVATION OF MASS AND ENERGY.
can't make something out of nothing.
3) I can post it but in PAR wiki theres a nice description of par and all the other mearument units and a fairly clear explanation of how the original tests were done they explained the sensor use. they say 4h3 results were misinterpreted. they reasonably explain that once minimum spectral requirements are met it's all about the photons.
4 ) lights , no matter the source , or explanation are rated on efficiency as lumens . there have to be government regulation for several reasons but efficiency is one , fair market practices are another.
a light with a higher lumen out put will physically put out more photons than less rated light. the color is a separate rating in par or Kelvin or whatever but its it's different than lumens.
ALL lights except a few put out acceptable spectrum for plants.it is just a out the efficiency.
2 lights with the same lumen rating but one has a better par will not neccesarily produce a larger better plant.
I am not against led I just want to know the FOOTCANDLE.
For all the talk of them , and the littelry hundreds of replies across 4 forums I have yet to have anyone just take a reading.
it is just that easy.
take a reading AND THEN let's discuss the results
 
johnsmith_559

johnsmith_559

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Does no one have a LED ? light meter apps are free on app store.
here is a screen shot of my apps
I got. a sound meter too .
the meter I am using even has a visual graph . cam do min max , avg's etc
 
johnsmith_559

johnsmith_559

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all lights read on photon meters .
red , blue, green yellow are all different colours but still photons
 
Aqua Man

Aqua Man

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well as I said I do not agree on the basis this is all light manufacturer propaganda.
1) light meters do not do anything other than photon readers in volume
so it is irrelevant what scale as it reads all scales in millivolt signals .
2) PAR or any other description of color or spectrum is not the same as photons read as fc or lux . we little led on a shelf has excellent par but is going to do shit for your large plant . the intensity of photons is what transforms into mass .
THE LAW OF CONSERVATION OF MASS AND ENERGY.
can't make something out of nothing.
3) I can post it but in PAR wiki theres a nice description of par and all the other mearument units and a fairly clear explanation of how the original tests were done they explained the sensor use. they say 4h3 results were misinterpreted. they reasonably explain that once minimum spectral requirements are met it's all about the photons.
4 ) lights , no matter the source , or explanation are rated on efficiency as lumens . there have to be government regulation for several reasons but efficiency is one , fair market practices are another.
a light with a higher lumen out out is physically put out more photons than less rated light. the color is a separate rating in par or Kelvin or whatever but its it's different.
ALL lights except a few put out acceptable spectrum for plants.
2 lights with the same lumen rating but one has a better par will not neccesarily produce a larger better plant.
I am not against led I just want to know the FOOTCANDLE.
For all the talk of them , and the littelry hundreds of replies across 4 forums I have yet to have anyone just take a reading.
it is just that easy.
take a reading AND THEN let's discuss the results
No footcandle sensors do not read all photons from spectrums equally.

ALL lights except a few put out acceptable spectrum for plants? What is acceptable?

I dont want acceptable for a plant to live i want ideal for best and healthiest growth. Spectral effects are HUGE here not just photos. Especially ratios of spectrums just like nutrients. There is so much scientific data out there on this its not funny.
 
johnsmith_559

johnsmith_559

210
28
No footcandle sensors do not read all photons from spectrums equally.

ALL lights except a few put out acceptable spectrum for plants? What is acceptable?

I dont want acceptable for a plant to live i want ideal for best and healthiest growth. Spectral effects are HUGE here not just photos. Especially ratios of spectrums just like nutrients. There is so much scientific data out there on this its not funny.
so how about a reading and we can discuss th4 theological aspects later ?
I do not know why this is so hard ?
I 100% understand there is a litany of information on light out there .I have a book on it from 1917 .much more complex then i thought they knew in 1917 .
but i want a physical light meter , from a free phone app stuck under one and the recording posted .
 
Aqua Man

Aqua Man

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Does no one have a LED ? light meter apps are free on app store.
here is a screen shot of my apps
I got. a sound meter too .
the meter I am using even has a visual graph . cam do min max , avg's etc
Also these apps are only as good as the sensor... I can tell you this as I know first hand between my hauwai and my samsung.

A quantum meter is what we really want and PPFD is far more accurate
 
Aqua Man

Aqua Man

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Sure light is at 50% at about 300w what ya need tested.
 
johnsmith_559

johnsmith_559

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Also these apps are only as good as the sensor... I can tell you this as I know first hand between my hauwai and my samsung
so do the reading and let's discuss it ..
at this point it is obvious evey on his worried it may not come out as expected.
bad sensor? maybe ..do the reading
differnt color photons? maybe ...do 4he reading
different spectral requirements? maybe ....let's just do the reading..please
 
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