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

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johnsmith_559

johnsmith_559

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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
Sure light is at 50% at about 300w what ya need tested.
so what is the FC at 1 ' , 2' 3' and 4' and the wattage of the led ?
 
johnsmith_559

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e
Those are lux values.
excellent! those seem like realistic values . am not sure why every one did not want to do it. that is
8700 4100 and 2100 fc.
those correlate perfectly .
do you know the rated lumen per watt ? it is a required value by the governing body
 
Aqua Man

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excellent! those seem like realistic values . am not sure why every one did not want to do it. that is
8700 4100 and 2100 fc.
those correlate perfectly .
do you know the rated lumen per watt ? it is a required value by the governing body
Gonna say around 2.4
 
growsince79

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Interesting. I just figured out why the inverse square law don't work with led. The led isn't coming from a single point. The led is spread out, so the distance between 1 and 2 feet to the censor isn't double.
 
johnsmith_559

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Interesting. I just figured out why the inverse square law don't work with led. The led isn't coming from a single point. The led is spread out, so the distance between 1 and 2 feet to the censor isn't double.
how does that work?
 
Aqua Man

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I need to calibrate the app against a known source and haven't done it with this one yet so the values will be higher. I did so with my other phone
 
growsince79

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how does that work?
pythagorean theorem.
If the qb is 1' above the censor, only 1 single led is exactly one foot away. The other 500 are more than 1' away. When you raise the light 1' only one single led is exactly 2' away. That's the only single led that doubled the distance. The rest didn't double.
 
Aqua Man

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All I know is the best meter we can use afaik is a quantum meter to get the most accurate representation of photons in each spectrum. Intensity is the most important followed by spectrum IMO. and spectral effects are absolutely a huge deal and not something to be left out of the equation. Including the rario of spectrum in relation to eachother.
 
Aqua Man

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I myself do use lux to gage intensity but only to ballpark it and adjust based on plant response... this is no different than I would do with a quantum meter.... I would use as a ballpark and adjust based on plant response so I don't feel fancy shit is needed.... however I would not ever use FC, Lux, Lumens as any point of reference for a blurple light.

When purchasing a light IMO its all about spectrum ratios, spread and efficacy. The intensity can always be adjusted by dimming or height.
 
growsince79

growsince79

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All I know is the best meter we can use afaik is a quantum meter to get the most accurate representation of photons in each spectrum. Intensity is the most important followed by spectrum IMO. and spectral effects are absolutely a huge deal and not something to be left out of the equation. Including the rario of spectrum in relation to eachother.
All I know is I bought a light meter and it totally fkd me up. I don't hardly use it now.
 
johnsmith_559

johnsmith_559

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All I know is the best meter we can use afaik is a quantum meter to get the most accurate representation of photons in each spectrum. Intensity is the most important followed by spectrum IMO. and spectral effects are absolutely a huge deal and not something to be left out of the equation. Including the rario of spectrum in relation to eachother.
the thing is once minimum spectral requirements it's all about the intensity . sort of like vitamins . you dont get bigger on proportion to the more you take. they meet the minimum requirements and then the rest are expelled. 2 lights the same out out both with different spectrums as long as they each have the minimum amount thr rest is about volume. doubling the par rating will do very little more . it is the same with the sun . it has a particular spectrum in the spring and summer but growth is similar. even the footcandles . there is 15000 + or 150000 lux on a bright day but we don't have plants significantly bigger than normal. size is also extremely relevant.things just dont double. they move in percentages relating to plant size . +/- 1 or 2% at a time . those crazy adds that say DOUBLE your harvest or EXPLOSIVE growth rate all fake terms that are meant to appeal to inexperienced customers. if a product adds more than 5% to your yield it means your were not doing some thing else in the first place
 
johnsmith_559

johnsmith_559

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I just use the free app... better than a lot of those cheap ones and like I say I use it to ballpark.
meet too . phones have better sensors than most meters . they all do a basic job though. +/-5 % or so nbd...they read light like ec meters resd salts. they just give a max reading but dont tell individual salts . you have to know what's in there for it to be really useful.
 
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