stardustsailor
Well-Known Member
Maybe ,you 're wrong about that ...CRI changes of course ...Wouldn't warm white plus 660 be a higher cri than all of those valoya types. Not that i chase cri, but last i remember cri goes above 90.
But CRI is an value ,for certain different color rendering and not just reds ..
For reds is R9 ,more spcifically ..
This Warm White +660 nm spectrum ,will affect the rendering of cooler colors like green and blue ...
And then the CRI ,probably does not get higher ,but actually lots lower ...
"
How is CRI Measured?
CRI is understood to be a measure of how well light sources render the colors of
objects, materials, and skin tones. How is the CRI number actually calculated? The test
procedure involves comparing the appearance of eight color samples (see upper right for
an approximation) under the light in question and a reference light source. The average
differences measured are subtracted from 100 to get the CRI.
So small average differences will result in a higher score,
while larger differences give a lower number.
Of all the colors possible, only these eight are measured.
Further, the samples used are pastels, not saturated
colors. CRI is calculated by measuring the difference between the lamp in question and a reference
lamp in terms of how they render the eight color samples. If the lamp to be tested has a
correlated color temperature (CCT) of less than 5000 Kelvin (K), the reference source is a
black body radiator (approximately like an incandescent lamp). For higher CCT sources,
the reference is a specifically defined spectrum of daylight. Therefore, light sources that
mimic incandescent light or daylight for the eight color samples are, by definition, the ones
that will score highest on the CRI.":
http://cool.conservation-us.org/byorg/us-doe/color_rendering_index.pdf
Valoya is not using Any RGB combo ,of what I'm aware of ..Ns1 is a rgb type? With lots of green? Interesting, very close to warm white..
I would have chose 4k for my setup but i'm on a COB buying break for now. It's close enough in the spectra neighborhood that I'll stay with 3k for now. Very warm, and fertile...
Even the "red " leds ,I think that actually are phosphor conversion ones and not monochromatic red diodes .
They must had their resons for doing so ,eh ?
4000°K +660 nm+730 nm ,is avery good spectrum for growing mj ...
3000° K alone is also very fine ...
5000°K +630 nm is also exceptional ...
3000°K + 660 nm is way warm ....
But still it can be very productive ...
Although ,my theory is that you just can't have those 660nm red diodes without any FR 730 nm monochromatics ,too..
Very strong absortion at 662 nm ,doesn not mean that the plant WANTS a lot of that wl...
(Human-centric logic that think that plants are ruled by thge laws applying for ..machines ...or computers ...)
It means that the plant is AFTER that wl ...
And well,it's kinda normal to expect that ...
There's not much of that wl (relatively to the rest PAR wls) in the Sun's light reaching the Earth's surface ...
(A % of these photons is absorbed by the atmosphere's water vapour )
At noon (March & September ) ,usually at equatorial and sub-equatorial regions ,
thta wl is at it's highest power ...And then mj lifts the leafs upwards ,in order to minimise the exposed leaf area to
sunlight .To protect it's photosynthetic systems from "overloading" ..Too many photons around then ...
i dunno ...
that's just my humble theory ...
I think in some cases,those, 660 nm red leds ,are just waste of energy ...
Plant's -seem to me,at least, that they "refuse " to "accept " that many 660 nm available photons ...
Yes,they are very well after them ..
But that's probably ,because they have learned ,through natural evolution practices (adaptation ),
that those photons are kinda hard to get ,at most of cases ...
And when it happens ,in certain places around the globe ,at certain seasons
and at certain time ,to have those photons available in excess ,then they just "lift" their leaves,to minimise exposure to light ..
Humans from the other hand,
especially some weirdos white-dressed ones ,that always look & inspect
the tree very closely and always neglecting the whole forest around ,saw once that a dilution of chlorophyll ,absorbs mostly at 662 nm ...
A dilution of Chlorophyll ...Not even the whole plant alive ...
And of course they thought ,the very next minute "Hey ,that 's exactly what plants want in order to thrive ! "
......
Two Things Are Infinite: the Universe and Human Stupidity.
(But ,I'm not quite sure about the former one ).
Albert Einstein
Cheers.