PF, this is vegging, flowering MJ is a different story
I will try those WW CC, i should have one or two engines almost for free. But i'm very sceptic with SDS theory. I didn't say he is wrong. I will thinking about all he said and make my own opinion, asking to specialists and professionals for accurate datas in mW or PPF. Actually i agree with Jubiare.
Phosphor layers decrease the efficiency. The
lower the CCT, the lower the efficiency.
Which of two ? The radiometric or the photometric efficiency are you referring to ?
Cause impact of red phosphor layer in RADIOMETRIC efficiency is rather detrimental , as opposed to impact at the photometric one ...
Lumen are related to human eye, yes, and human eye sees the green very well, and yellow and cyan, so the more cyan/green/yellow (green is the most important) in the spectrum the more the luminous flux in lm. When i see the XTE graph, it has green, yes, and cyan and yellow, and it is 131lm/W at 25°C.
But the red peak is much bigger,
???? Look closely ....
this spectrum has relatively a lot more red than a oslon CC 2700K given at 89lm.
No Way !!!!
More Ambers yes ..Reds ,NO! ..... BY ALL MEANS NO !!!!
* 1 *
As we said sooner,
lumen are only useful to compare 2 leds of same CCT
^^^NO ! FAR FROM TRUTH !!!
or spectrum.
^^^YES ,ONLY AT THAT CASE.WITH THE EXACT SAME SPECTRUM,nm for nm !!! !!
So when i compare the 2900K XTE graph with the 2700K LCW CC graph there is only 200K of difference,
so lumens are representative of efficiency,
^^^^NO ! FAR FROM TRUTH !!! Not for real power efficiency ...
so
i would say that the XTE is more efficient, by far, and she has a better thermal resistance.
^^^Maybe yes ,maybe no ....Thermal Resistance is not enough ,by itself,to judge a led's efficiency ....
And when
SDS says that plants are using all the wavelengths, maybe he is right, maybe green could be useful for flowering. When I tried NW+red spectrum i had very good results and this spectrum has principally blue/green/red and hyper red, and it worked.
I'm not the one saying that ..Plants ,do ....(Along with many scientists and modern researches ..)
I know that all strains don't like pure blue/red spectrum (some do), and I sure that for flowering (all strains), the spectrum needs other wavelengths. I thought it was yellow/orange + far red and IR. Maybe green is more important than I thought. I will take it in consideration.
Anyhow I will know who is right soon about efficiency, i will wait for Osram's answer, if i don't have it, one friend has a led company, with integration sphere and everything to measure the radiant power. I should do it for free.
The thing i would like to know is to convert it to Micromoles (PPF), it is more important for us than Watts, the energy carried by a photon is related to its wavelength.
Here ....=> (*
For 1 Watt of flux,per nm ...)
I.e 1 Watt of light at 600nm is ~ 5 umoles/sec
Or ...
. 1 Watt of light of x wavelength = x ( nm ) / 119.708 umoles/sec ......