Light Quantity vs Light Quality Evidence ... Just for 4 u gg lol!

[boertje]

@ Hybridway

Quantity x Quality x uniformity is the formula for optimal photosynthetic action potential in my handbook.


HPS low cri is a bitch when it comes to inter-nodal spacing and stem elongation, wich are both related to crop yield

 

[Johnnycannaseed1]

@ Hybridway
Quantity x Quality x uniformity is the formula for optimal photosynthetic action potential in my handbook.

I like how you put that, excellent

 

[Hybridway]

@ Hybridway

Quantity x Quality x uniformity is the formula for optimal photosynthetic action potential in my handbook.


HPS low cri is a bitch when it comes to inter-nodal spacing and stem elongation, wich are both related to crop yield

I agree w/ the first part.
But as far as HPS spectrum & CRI causing this or that, in return getting Less yield. That's just a bunch of Mumbo-Jumbo mostly said by those who read about it but never did it. No offense to you. Long branches grow large colas & allow light to other lower buds.
Something else to consider is those there HPS hoods throw off some pretty good ppfd #'s maintained well w/ spread in which negates allot of that single light source talk too in regards to HPS. Plus their #'s don't drop drastically every 3" down.
HPS spectrum grows the biggest buds w/o a boat load of 660 or 450 w/ low, low CRI.

 

[Randomblame]

In this day and age, NO specs, No selects.....But maybe there is a glimmer, Randomblame?

Lets put up a bin code and judge them for their real worth....please....

Well spoken, brother Abiqua!
But I do not like them because of their binnings, I like them because of their concept creating a complete 360° dome.

I would create my own "LED-spheere" using low driven F-Series strips(S6/A1 bins, just because I know, you like bins).
I've only a small area to play with and want to use as much heights of it as I can and this concept allows me to practically use the full volume of my tent(2' x 2'x 6').
That's why I like it!!

Also would like to know more about this in your signature:
All about the terpenes.....
Low nm blue with lots of blue green and lots of red from 610nm-680.
LED ANARCHY - about DATA, not OWNERSHIP

Is there anything I can read about it? Any link or pdf's? I'm really interested in low nm blue/purple LED and it's influence on terpene production. Thanks!

 

[boertje]

actually, i have only grown with HPS for over 20 years, and still do.

The high PPF of the HPS will only be sufficient with short plants,regarding inter-nodal spacing and stem elongation. With bigger plants HPS will induce SAS, again associated with crop yield.

Even Gavita says to supplement their DE with MH for best results.

edited: https://dl.sciencesocieties.org/publications/aj/abstracts/83/5/AJ0830050903

 

[MichiganMedGrower]

Here is a Utah State University Spectral Analysis of common light sources.

Shows the same need for a little blue light as above. And uv.


https://www.cycloptics.com/sites/default/files/GB USU Spectral Characterization link.pdf

 

[boertje]

configuring a light system for optimum yield and quality takes a bit more effort then only running HPS, no offense.

 

[boertje]

Regarding your statement of diminishing photon flux, i am not shore if you are referring to led light systems. If you are then i would advice to read this white paper of Cree:

http://www.cree.com/led-components/media/documents/HorticultureReferenceDesign.pdf

And perhaps dig in to the inverse square law of light

 

[Johnnycannaseed1]

I like them because of their concept creating a complete 360° dome.

I've only a small area to play with and want to use as much heights of it as I can and this concept allows me to practically use the full volume of my tent(2' x 2'x 6').
That's why I like it!!

Right on Randomblame the key point being able to make full use of the volume. I have toyed with multi layering and did begin to think about inter-canopy lighting and whether it would be more efficient than multi layering, then I came across hybrids thread and was like wow what a cool concept.

Also would like to know more about this in your signature:
All about the terpenes.....
Low nm blue with lots of blue green and lots of red from 610nm-680.
LED ANARCHY - about DATA, not OWNERSHIP

Is there anything I can read about it? Any link or pdf's? I'm really interested in low nm blue/purple LED and it's influence on terpene production. Thanks!

With regards to terpene production also look into Jasmonic Acid - Methyl Jasmonates
Quote;
"MeJ and JA have been proved to be able to elicit the production of several compounds (alkaloids, terpenoid, and phenolic phytoalexins, coumarins, and taxanes) in many plant species".
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3329344/

Plants stress creates amazing terpene profiles
http://thcdesign.com/manipulating-plant-stress-create-amazing-terpene-profiles/

The effect of ultraviolet radiation on the accumulation of medicinal compounds in plants
http://www.sciencedirect.com/science/article/pii/S0367326X09000422

Patent - Methods of growing cannabaceae plants using artificial lighting
https://www.google.com/patents/WO2016054268A1?cl=en

Selection of bioactive Terpenes and reproductive cycles of Cannabis Sativa, C. Indica
https://conservancy.umn.edu/bitstream/handle/11299/175829/Ali Schwier - Cannabis.pdf?sequence=1&isAllowed=y

Using spectrum to design your plant
https://californialightworks.com/using-spectrum-control-design-plant-aka-photo-morphogenetics/

Terpene sythases from Cannabis sativa
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5371325/

Influence of ultraviolet radiation on plant secondary metabolite production
http://retnomastutibiologi.lecture.ub.ac.id/files/2015/11/Modul-1-Ultraviolet-radiation-GPP_2_3-4_113-144.pdf

Effects of light quality on the growth and essential oil production in Mexican mint
http://www.actahort.org/members/showpdf?booknrarnr=1134_32

UV-A effects on photomorphgenesis and essential-oil composition in Mentha piperita
https://s3.amazonaws.com/academia.edu.documents/42711025/UVA_effects_on_photomorphogenesis_and_es20160215-12419-mwen2r.pdf?AWSAccessKeyId=AKIAIWOWYYGZ2Y53UL3A&Expires=1502811550&Signature=b8aIDAjgYpNEi7L5DkswBwnuRD8=&response-content-disposition=inline; filename=UV-A_effects_on_photomorphogenesis_and_e.pdf

Terpenes the flavours of Cannabis Aromatherapy
https://www.leafly.com/news/cannabis-101/terpenes-the-flavors-of-cannabis-aromatherapy
https://www.leafly.com/news/tags/terpenes

 

[Randomblame]

Whow! Thanks a lot, report me in a month, when I've done all the studies, LOL!

 

[Johnnycannaseed1]

Whow! Thanks a lot, report me in a month, when I've done all the studies, LOL!

No problem, I shall look forward to your summary

In the meantime got a couple more PDF's for you;

Strawberry Flavours; Diverse chemical compositions a seasonal influence and the effects on sensory perception
http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0088446&type=printable

Identification of a Strawberry flavoured Gene;
https://bmcgenomics.biomedcentral.com/track/pdf/10.1186/1471-2164-15-217?site=bmcgenomics.biomedcentral.com

And key word search "kevin folta light recipes" he is on the cutting edge of this field, and I have seen the proof with my own eyes (see the beginning of this thread) that light does indeed affect flavours/aroma's/Plant biomass.

 

[boertje]

Kevin folta is a very controversial scientist and very much associated with Monsanto and GMO(talking biotech podcast).Still great articles though

 

[Johnnycannaseed1]

Whoa I did not know Folta was in bed with Mon-satan, but now you mention it, it makes sense given his area of expertise... he has even got this shifty, uneasy, I work for the dark side look about him


Kevin Folta front left (press reply to view pic because RIU is screwy)

 

[Randomblame]

Holy joint, I think, I've seen his eyes flashing for a moment and could swear, I hear the devil laughing..
Seems he needs an exorcism!

 

[hybridway2]

Ok then how well does a Red render under 8,000k - 12,000k blue sky surely it will render much better under 5000k?

Never heard of an 8-12,000k blue sky. 57k is approx spring/afternoon sky. Enhance that with reds & 420 & ur good to go.
Blue is way underrated in flower. Especially 420.