LED light power versus sun light

[anarchist59]

Hi. I have from my work a calibrated laser power meter, the sensor is an photoelement square 1 cm.
The meter reads directly the Watt of the light.
To measure you must first select the freqency. From 300 to 1000nm you can select any frequency you want.
You can NOT select a range.
When the sun is shining and i go out and measure the power of the sun at selected freqencys
There is so much power in the lower rang. 440 nm is 350mW. 660 it drops to 200mw
If I try to get the same power in the grow tent. I have a bunch of cxa3590
Yes i can simulate the sun. But the the plants will die soon from overlight
Even when I manage to prevent the plants of the the heat.

WHY???

 

[canadian1969]

Good question, subbed
boy oh boy what I would give to play with that meter right now.
You wouldn't happen to have data for 300 through 400 ??(10nm increments maybe)

 

[giglewigle]

subbed this is gunna be ineresting

 

[TacoMac]

The reason is simple: the sun is far, far, far, far (say that about 10 billion times) more powerful than your light. But that light is filtered and buffered by 300 miles of atmosphere, refining it to a perfect level that plants and animals have grown accustomed to over millions and billions of years.

Your light is just a light that's sitting two feet over your plant. It's nowhere near the quality of the sun. No light is.

 

[anarchist59]

Thats obviously, but that is not the answer, we produce light arifically. And we are are able to produce nice vegetables for years in green houses. So we simulate the sun and we all know the spectrum the plant does
Not like. Green because its reflected light. The ather spectrum the plants love. Is a lot of discussion.

I took readings in bright sunlight just now
400nm 300mw overload
440nm 287mW
500nm 200mW
550nm 160mW
600nm 150mW
660nm 85mW
785nm 20mW

May be a ph
Physiker can tell why

The Meter is a nova from ophir head is PD300

 

[TacoMac]

Mankind has never, ever, ever produced a light equal to the sun. NASA has tried it for decades and spend 10's of millions of dollars trying.

Producing a light that will grow plants and trying to match the sun are two completely, totally different things.

If you think your piddly little 100 dollar light meter from Amazon is telling you everything about the spectrum of the sun, then you're even more stupid than you're presently acting.

 

[Johnnycannaseed1]

Mankind has never, ever, ever produced a light equal to the sun. NASA has tried it for decades and spend 10's of millions of dollars trying.

Producing a light that will grow plants and trying to match the sun are two completely, totally different things.

If you think your piddly little 100 dollar light meter from Amazon is telling you everything about the spectrum of the sun, then you're even more stupid than you're presently acting.

The sensor he is using clearly isn't some $100 jobby from Amazon...Don't be loser cluttering up his thread, clearly, his experiment has validity and is worthy of investigation.

I would like to add to the conversation by saying it appears daylight and sunlight are not the same things, rather daylight is a result of the suns light hitting and reacting with the different noble gases in the atmosphere, not sure how it will help but make of it what you will.

 

[Johnnycannaseed1]

@anachist can you take 3 sets of readings
(1) during Mid Morning,
(2) during the hours before Sunset,
(3) during Sunset

Can you also take readings of the following wavelengths below at the 3 times above and post your results here Cheers

320nm
350nm
380nm
410nm
430nm
450nm
470nm
500nm
525nm
550nm
580nm
600nm
630nm
660nm
680nm
700nm
730nm
750nm
770nm

 

[PSUAGRO.]

The fact that most of us are using FIXED sources for indoor lighting is a huge draw back vs outdoor to start with............nevermind the spd

good luck on your quest

 

[Stephenj37826]

The fact that most of us are using FIXED sources for indoor lighting is a huge draw back vs outdoor to start with............nevermind the spd

good luck on your quest

It could be possible with Sulfur Plasma. Not sure if the gain in spectrum but it's doable just not to efficient.

 

[canadian1969]

@anachist can you take 3 sets of readings
(1) during Mid Morning,
(2) during the hours before Sunset,
(3) during Sunset

Can you also take readings of the following wavelengths below at the 3 times above and post your results here Cheers

320nm
350nm
380nm
410nm
430nm
450nm
470nm
500nm
525nm
550nm
580nm
600nm
630nm
660nm
680nm
700nm
730nm
750nm
770nm

Dont ask for much do ya lol

 

[PSUAGRO.]

It could be possible with Sulfur Plasma. Not sure if the gain in spectrum but it's doable just not to efficient.

Is it "affordable" yet? ......... mh plasma turned out to be a big disappointment imo

 

[714steadyeddie]

If you think your piddly little 100 dollar light meter from Amazon is telling you everything about the spectrum of the sun, then you're even more stupid than you're presently acting.

Lol

 

[Stephenj37826]

Is it "affordable" yet? ......... mh plasma turned out to be a big disappointment imo

There is a company claiming 2.4 umol/ j but I'm inclined to think closer to 1.3-1.4. I could be totally wrong though. They use a magnatron to drive the little bulb. They give a life time warranty on the bulb lol (magnatron dies at 40k hrs). Time will tell..... Of course I'm not waiting around we are marching forward with our efficiency mission lol.

 

[nfhiggs]

Thats obviously, but that is not the answer, we produce light arifically. And we are are able to produce nice vegetables for years in green houses. So we simulate the sun and we all know the spectrum the plant does
Not like. Green because its reflected light. The ather spectrum the plants love. Is a lot of discussion.

I took readings in bright sunlight just now
400nm 300mw overload
440nm 287mW
500nm 200mW
550nm 160mW
600nm 150mW
660nm 85mW
785nm 20mW

May be a ph
Physiker can tell why

The Meter is a nova from ophir head is PD300

Do not be taken in by the "green light is not used myth"

 

[anarchist59]

@tacoma

I understand. In the tent. If the light source is at the canopy. We have a huge amount of light drop from the top to the bottom. The sun is so far away. So we have the same light intensity all over the plant, if not shaded by other leaves. But the reflekted light may be also mor intensitive.

 

[canadian1969]

Do your meter reading roughly match the diodes spectrum?
http://imgur.com/a/wzvzs

 

[anarchist59]

I have 4000 3000 and 2700. I will find out
I use all of them at the same time
To simulate the sun.

To the ather user. We will be cloudy this week
Maybe later and i made a write mistake
The lowest range is 400nm sorry

 

[canadian1969]

I have 4000 3000 and 2700. I will find out
I use all of them at the same time
To simulate the sun.

To the ather user. We will be cloudy this week
Maybe later and i made a write mistake
The lowest range is 400nm sorry

Cool, I thought the specs on your meter where down to 350 and up to 1000 or so

 

[Johnnycannaseed1]

To the ather user. We will be cloudy this week
Maybe later and i made a write mistake
The lowest range is 400nm sorry

No Probs, as soon as you get some more sun is all good in my books lol

Since your Meter only goes down to 400nm can you take these measurements instead cheers

(1) During Mid Morning,
(2) During High Noon
(3) During the hours before Sunset,
(4) During Sunset

410nm
430nm
450nm
470nm
500nm
525nm
550nm
580nm
600nm
630nm
660nm
680nm
700nm
730nm
750nm
770nm