URSA LED
Well-Known Member
Hey stardustsailor,
Great info! Just what we've been looking for.
Just a heads up, the Duet 2400 was designed for plant grow in general (not specifically for cannabis), however we may decide to run with a white light with 660nm depending on market reaction.
We'll have a better idea after hempcon.
Our research team including me will be going through this data today.
Great info! Just what we've been looking for.
Just a heads up, the Duet 2400 was designed for plant grow in general (not specifically for cannabis), however we may decide to run with a white light with 660nm depending on market reaction.
We'll have a better idea after hempcon.
Our research team including me will be going through this data today.
Thank ,once again ,for your answers .
The question is like that- ( rephrased ) :
Why 552.4 umols/sec of the ( red nitride ? ) phosphor output ( broadband 660 nm ) versus
1036,2 umols/sec of the 455 nm chips output ?
For most plants it should be the other way around ..
(Duet 2400 @ 6A )
- Why would anyone want to use white light to grow marijuana?
( Quick answer ? Cause white light grows plants ,better than any monochromatic combination .... Real Life Field tested 101% ! )
For quite a few reasons,to be more precise :
a ) Firstly to check upon plants for under or over fertilisation , pathogens and/or other plant health issues .
White light helps our vision ,for doing so ..
Furthermore white light makes a nice and relaxed "environment " for human vision ,
when attending the garden ...
b ) Green wavelengths serve as a "slow down " signal to the photosynthetic systems .
Very useful ,when growing under ( of non- variable characteristics ) artificial lighting,
for 12 hours or more .
Nobody wants oversaturated & exhausted chloroplasts .
c ) " The absorption level for green is extremely low on plants " ...
Rather false statement ,I should say ,If I may be excused ...
Lower than blue and red wavelengths yes ,but not " extremely low " .
Extremely low is the absorption over ~730 nm .
Furthermore ,the " Relative Quantum Efficiency " of green wls ,
is actually higher than of blue ones ...
( As also RQE of 600-620 nm amber-red wls is higher than of 660 nm )
d ) "Green window " ...Quite a few folks ,like to call it " light penetration " ..
As blue & red wls ,tend to be readily absorbed by the top layer foliage ,
something has to be "left " for the lower parts of canopy ,to be "fed "...
That "something " is the green and yellow wls ,that are being transmitted through the top layer leaves to the underlying leaves ...
During the early era of LED growing ,many had pointed out that "LEDS lack penetration " ,
when compared with the "trad" HIDs ...
HIDs do emit a good amount of green and yellow wls ..(power-wise )
Blue and Red monochromatic LEDs do not ...
Thus ,they lack ....penetration ..
( ...Damn ,those Kevlar-reinforced leaves .... ... )
e ) Blue wls output should not be more than 10-20% of the total output ,in power terms ...
(photobleaching & photoinhibition await somewhere around here ...check question #2 )
Cool white ( phosphor converted ) ,can easily provide the blue wls needed (in power terms ),
plus it also supplies the plants with the VERY useful green and amber wls ..
.....
Hope I was helpful...
More info > here < .
( You should consider hiring an experienced grower as an advisor ...
LOL!
Me for example ...... )
Cheers.