COB vs blurple spectra

BOBBY_G

BOBBY_G

Well-Known Member
sorry for the several spectra thread going, im gonna try to consolidate a few different threads here

first off: the infamous mccree curve were all familiar with



and a chlorophyll curve ill borrow from another thread:



@SupraSPL posted this most excellent curve of popular color temps in this thread . Im not sure how universal and hard and fast these are for different mfrs and their individual color temps.



Lastly we have this image of spectra i shot of two popular blurples who both claim to have a 'full spectra' of note is they are damn near identical except kind's blue range is slightly higher:



Presumably theyve put some research in (both companies claim to have plant scientists in the development team)

Point being note how much higher the 660 band is in this, where it seems to be on the lowe end of the color temp graph above.

for comparison, arguably one of the best HPS on the market right now, Ushio pro hilux gro DE, 2100K:



looking at the data above, i feel that really 3000K is pushing it too high for ideal flowering. like 2700 would be ideal. thoughts?
 
Atulip

Atulip

Well-Known Member
Based on your charts, it appears there's no reason to choose 2700, 3000, or 3500, when 4000 is near identical in red(looks like 5% less 660 red than 2700), and has more of everything else.
 
BOBBY_G

BOBBY_G

Well-Known Member
good observation!

yes but is more blue better?

i guess par light is par light

supra is an advocate for as little as possible. i could see where too much could make your crop leafy i guess.

maybe this is why lower color temps are less efficient. higher color temps have all of the same red plus more blue lacking in the lower color temps

also not sure how absolute that is. we need som real spectral data on these cobs
 
Atulip

Atulip

Well-Known Member
IIRC, the lower K lights have the blue dialed down rather than ramping up the red, so there's overall light loss when dropping to lower K.

I'd say more light is always better unless you're at the point where you're bleaching. I don't think more blue will make a strain more leafy, just tighter packed nodes.
 
A

augusto1

Well-Known Member
I don't understand because you can vegg and flower with HPS but I don't see that you can do the same with any of the COB that are available right now or maybe I am wrong.
 
hillbill

hillbill

Well-Known Member
Some plants do seem to appreciate a bit higher k rating. They just do. I am not committed to any single k rating. There will be more leafy development and less density(not much) with above 3000k or so. There may also be more of a complete expression of what your favorite plant is all about. That noted, more red tends to make bigger and denser.

The veros and Crees are putting out such a fuller spectrum. Closer to the sun and so much more efficient. The ushio is one of the better street light bulbs. Just a slight tweaking of not so good spectrum. Overwhelming sheer photon power makes up for that in hps at the expense of heat and light that the plant cannot use real well.
 
hillbill

hillbill

Well-Known Member
Most hps charts do not show the huge IR spike! They all have it all but maybe plantmax is one of the only ones that was putting the whole chart on their box. Thanks for putting those charts up.
 
Getgrowingson

Getgrowingson

Well-Known Member
hillbill said:
Most hps charts do not show the huge IR spike! They all have it all but maybe plantmax is one of the only ones that was putting the whole chart on their box. Thanks for putting those charts up.
Click to expand...
Exactly as some companies are stuck in the old school thinking that plants don't use anything above 700nm. Which we know now isn't true it's just diminished vs the 400-700
 
Getgrowingson

Getgrowingson

Well-Known Member
hillbill said:
Most hps charts do not show the huge IR spike! They all have it all but maybe plantmax is one of the only ones that was putting the whole chart on their box. Thanks for putting those charts up.
Click to expand...
Far red is super important to plants but more for putting them to sleep like a baby. I've tried far red on all the time previously at my buddies grow and it seemed to stretch them out like mad compared to normal. Not a great test imo but we won't be doing it again. At least not at those levels. We now use it at lights off and my buddy gets almost a complete other run in during the year. Pretty awesome imo
 
Rahz

Rahz

Well-Known Member
Atulip said:
Based on your charts, it appears there's no reason to choose 2700, 3000, or 3500, when 4000 is near identical in red(looks like 5% less 660 red than 2700), and has more of everything else.
Click to expand...
The charts are showing relative intensity, so the levels aren't absolute/directly comparable between K temps.
 
C

churchhaze

Well-Known Member
Getgrowingson said:
Far red is super important to plants but more for putting them to sleep like a baby. I've tried far red on all the time previously at my buddies grow and it seemed to stretch them out like mad compared to normal. Not a great test imo but we won't be doing it again.
Click to expand...
It's not a great test, but it's so easy to come to a quick conclusion that most people refuse to ever do it again! This is why I dare people who don't believe in the effects of 730nm to turn it on during the day and see what happens. They will never question it ever again!!
 
guod

guod

Well-Known Member
Getgrowingson said:
Far red is super important to plants but more for putting them to sleep like a baby. I've tried far red on all the time previously at my buddies grow and it seemed to stretch them out like mad compared to normal. Not a great test imo but we won't be doing it again. At least not at those levels. We now use it at lights off and my buddy gets almost a complete other run in during the year. Pretty awesome imo
Click to expand...
and mother nature puts the plants into sleep all day long at this level of Far-Red...

farred.jpg
 
stardustsailor

stardustsailor

Well-Known Member
guod said:
and mother nature puts the plants into sleep all day long at this level of Far-Red...

View attachment 3587974
Click to expand...
Brother Guod ,I wanted to ask something to you ...

Is there any evidence that higher green plants ( like mj ,for example ) do have Chlorophylls D & F (far red Chlorophylls ) ?
Or they are present only in marine plantae kingdom ,like red algae and cyanobacteria ?
Do you have any info / links ?
 
guod

guod

Well-Known Member
stardustsailor said:
Brother Guod ,I wanted to ask something to you ...

Is there any evidence that higher green plants ( like mj ,for example ) do have Chlorophylls D & F (far red Chlorophylls ) ?
Or they are present only in marine plantae kingdom ,like red algae and cyanobacteria ?
Do you have any info / links ?
Click to expand...
landplants have no Chlorophylls D or F (see MCCree) just only phytochrome as a sensor Pigment for Far-Red.

Chlorophyll a and b comes in different bindings on the molecular level which results in different absorption wavelengths.
but non of them are higher then 700nm

Photosystem I
antennen03.gif

Photosystem II
antennen02.gif

if you wont go deeper here are some Keywords for Google
CP43 (PsbC) and CP47 (PsbB)


 
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