LED light power versus sun light

VegasWinner

Well-Known Member
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???
Approximately 55% of all sunlight falls in the 440nm range uv ir to name a couple. Artificial light can not replicate the power at the same frequency cost effectively. Consider the 440nm range as that of solar flares and other high energy solar activities. COB's do not generate energy anywhere near the levels the sun can produce.
 

canadian1969

Well-Known Member
Approximately 55% of all sunlight falls in the 440nm range uv ir to name a couple. Artificial light can not replicate the power at the same frequency cost effectively. Consider the 440nm range as that of solar flares and other high energy solar activities. COB's do not generate energy anywhere near the levels the sun can produce.
Were you high when you wrote that? bongsmilie
 

Johnnycannaseed1

Well-Known Member
Approximately 55% of all sunlight falls in the 440nm range uv ir to name a couple. Artificial light can not replicate the power at the same frequency cost effectively. Consider the 440nm range as that of solar flares and other high energy solar activities. COB's do not generate energy anywhere near the levels the sun can produce.
Vegas you are right COB's do not generate anywhere near the energy levels of the sun.... But if you think about it, they do not need to. COB's etc only need to be able to replicate (at best) what the sun is doing as it hits 1m2 of planet earth, remember the sun's energy is diminishing by the square of the distance, so by the time sunlight hits the earth its energy will have vastly diminished and will end up being more in line with planet earth technology lol.
 

anarchist59

Member
i took some measurements with different light sources just to see what frequencys they radiate.
reading is energy in mWatt

1. 100 watt normal incanslight bulb no reflektor distance 30 cm
2. cheap consumer led reflektor bulb 2700k 530 lumen distance 30 cm
3. cheap consumer led no reflektor 2700k 1000 lumen "
4. cheap fluorescent tube brezel type 55 watt cleare whithe with reflector "
5. Osram L18W/865 fluorescent tube no reflector distance 10 cm
6. cheap LED spotlight with reflektor bright white 14 Watt distance 37 cm
7. CREE CXA 3590 2700k 700mAmp constant current distance 30 cm with white lidl reflector
8 noon total cloudy no sun partly raining outside reading

400 450 500 550 600 660 785nMeter
1 3.8 15 13 10 9,5 5.3 1.2
2 5.6 2.2 1.9 1.5 1.4 0,7 0.2
3 5.6 2.1 1.8 1.4 1.3 0.7 0.2
4 13 5.2 4.5 3.4 3.2 1.8 0.45
5 5 2 1.7 1.3 1.2 0.7 0.16
6 8.8 3.6 2.8 2.2 2.2 1.2 0.3
7 80 32 27 21 20 11.5 2.6
8 3 13 10 8 7.5 4.2 1.0

intersting the normal 100 watt bulb has infra red emmission

and there was no noticible difference between the cree 2700 and 3000 K Cree´s
 

canadian1969

Well-Known Member
Something is wrong there. The readings for your COB dont look right. You should have the bulk of the power in a 2700/3000K in the 580-660 area with a peak approximating half that power at 440-460. CRI 70/80/90 CRI makes a difference too but just assumed 3000K 80CRI

http://imgur.com/a/wzvzs

This should correlate roughly. I would think, maybe not, but if thats the case these spectral power distribution charts are useless. When I look at that data for number seven, I instantly think 5700-6000K.
 
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wietefras

Well-Known Member
Wageningen University created a light with the approximate spectrum of sunlight. It's not very efficient though, but for lab tests with something resembling sunlight it apparently very successful (according to their own statements). It's a plasma phosphor bulb from what I understood.

If you want to get the huge amount of blue that sunlight has, you'd better add the blue COBs instead of only using "white" ones. White COBs have their peak in the red range. Perhaps in combination with some "lime" leds to get the green which COBs are a bit low on. Not sure why anyone would bother but still.

Citizen en Cree have these phosphor leds that come without a phosphor coating. They produce blue light very efficiently. For instance the Citizen CLU048-1212C4-B455 or Cree XLamp XP-G3 Royal Blue.
 

VegasWinner

Well-Known Member
Vegas you are right COB's do not generate anywhere near the energy levels of the sun.... But if you think about it, they do not need to. COB's etc only need to be able to replicate (at best) what the sun is doing as it hits 1m2 of planet earth, remember the sun's energy is diminishing by the square of the distance, so by the time sunlight hits the earth its energy will have vastly diminished and will end up being more in line with planet earth technology lol.
The percentages are not the same. Sun 55% 440nm artificial light??% 440nm less than sunlight
 

VegasWinner

Well-Known Member
Were you high when you wrote that? bongsmilie
The total amount of energy received at ground level from the Sun at the zenith depends on the distance to the Sun and thus on the time of year. It is about 3.3% higher than average in January and 3.3% lower in July (see below). If the extraterrestrial solar radiation is 1367 watts per square meter (the value when the Earth–Sun distance is 1 astronomical unit), then the direct sunlight at Earth's surface when the Sun is at the zenith is about 1050 W/m2, but the total amount (direct and indirect from the atmosphere) hitting the ground is around 1120 W/m2.[5] In terms of energy, sunlight at Earth's surface is around 52 to 55 percent infrared (above 700 nm), 42 to 43 percent visible (400 to 700 nm), and 3 to 5 percent ultraviolet (below 400 nm).[6] At the top of the atmosphere, sunlight is about 30% more intense, having about 8% ultraviolet (UV),[7] with most of the extra UV consisting of biologically damaging short-wave ultraviolet.[8]
https://en.wikipedia.org/wiki/Sunlight
 

VegasWinner

Well-Known Member
Were you high when you wrote that? bongsmilie
I thin k you just like to attack whatever I say. I could say the sky is blue and you would claim I lack knowledge and must be high. they call that self projecting. projecting your own self onto others. quite common for some groups of people.
 

Johnnycannaseed1

Well-Known Member
No artificial lights do not generate anywhere near the light intensity in the 440nm range. You do not have to be high to understand that. Artificial lights do not generate 55% of their illumination in the 440nm range. Simple concept.
Ahhh apologies I see what you are saying now, sort of I think so bear with me.

Are you saying most artificial fixtures do not generate the same levels of 440nm as the sun correct?

Are you also saying that 55% of sunlight comes from 440nm range?... Looking at another of your posts I do not think you are, but in this post, it seems to be what you are saying hence things got/get a little confused lol.
 

Johnnycannaseed1

Well-Known Member
Something is wrong there. The readings for your COB dont look right. You should have the bulk of the power in a 2700/3000K in the 580-660 area with a peak approximating half that power at 440-460. CRI 70/80/90 CRI makes a difference too but just assumed 3000K 80CRI

http://imgur.com/a/wzvzs

This should correlate roughly. I would think, maybe not, but if thats the case these spectral power distribution charts are useless. When I look at that data for number seven, I instantly think 5700-6000K.
Agreed, things sure got interesting lol!
 

Johnnycannaseed1

Well-Known Member
400 450 500 550 600 660 785nMeter
1 3.8 15 13 10 9,5 5.3 1.2
2 5.6 2.2 1.9 1.5 1.4 0,7 0.2
3 5.6 2.1 1.8 1.4 1.3 0.7 0.2
4 13 5.2 4.5 3.4 3.2 1.8 0.45
5 5 2 1.7 1.3 1.2 0.7 0.16
6 8.8 3.6 2.8 2.2 2.2 1.2 0.3
7 80 32 27 21 20 11.5 2.6
8 3 13 10 8 7.5 4.2 1.0

intersting the normal 100 watt bulb has infra red emmission
Tbh the incandescent reading threw me because they are renowned for pumping out IR...if you click reply to my post you should see the enclosed chart within... RIU is really screwy atm:eyesmoke:.

 

canadian1969

Well-Known Member
I thin k you just like to attack whatever I say. I could say the sky is blue and you would claim I lack knowledge and must be high. they call that self projecting. projecting your own self onto others. quite common for some groups of people.
And a shrink too, wow. all right buddy, back on the ignore list for ya. lol
 
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