Uva Uvb + White Led Community Help!

GT21

I like soup
Supporter
I think it becomes important - that if you aren't absolutely positive of the emission of your source (documented spectrum or measurement. measurement is *much* better) that some lamp sources may have significant harmful components. Reference: http://www.uvguide.co.uk/index.htm

Worth a read to understand why those guys found it necessary to measure lamp spectrum to protect their pets.
Alright. ..we now have a ultraviolet sticky... i made sure to add this thread to it... we have a few other great uv threads but i dont have time to find them haha

https://www.thcfarmer.com/community/threads/ultraviolet-a-b-advanced.87172/
 
Excellent, GT21! You made my day. I think this is important stuff to grok - too many newbies and too little safety info attached. I think this is like the "how to build a grow room without burning your house down" ( paraphrased. another thread here ... so much awesome content! ).

You guys are the best. Really. THC Farmer Staff makes this forum worthwhile. Consistently.
 
I think it becomes important - that if you aren't absolutely positive of the emission of your source (documented spectrum or measurement. measurement is *much* better) that some lamp sources may have significant harmful components. Reference: http://www.uvguide.co.uk/index.htm

Worth a read to understand why those guys found it necessary to measure lamp spectrum to protect their pets.
great info, that site help me understand a lot of unknowns thank you. :)
this was the most useful piece of information on that site for myself
decsolstfairweather-800px.gif

thanks again
 

GT21

I like soup
Supporter
great info, that site help me understand a lot of unknowns thank you. :)
this was the most useful piece of information on that site for myself
View attachment 675799
thanks again
This chart is very useful.. if you understand what its saying hahaha. At sun rise and sun set the photons have to shoot through the side of the atmosphere and this blocks a lot of light due to particles and water (clouds) in the atmosphere. At around noon it is shooting straight down onto the surface of the earth and that is where the atmosphere is the thinnest. This is why we see our highest uv index around noon.
 

GT21

I like soup
Supporter
Excellent, GT21! You made my day. I think this is important stuff to grok - too many newbies and too little safety info attached. I think this is like the "how to build a grow room without burning your house down" ( paraphrased. another thread here ... so much awesome content! ).

You guys are the best. Really. THC Farmer Staff makes this forum worthwhile. Consistently.
Just trying to spread the knowledge bro. Were all in this game together so if i can shorten someone's learning curve im all for it. Some(like myself) took years and lots of biology, thermodynamics and physics to figure some things out. I like learning but some just need a cut and dry set of material that pertains to growing the plant we all love.
 
To go into your last questions a bit... heres another good article on the purpose of trichs and the secondary plant metabolites the trich holds. In general its thought that photosynthesis or your photo system 1 and 2 and your chlorophyll a and b are for growth and the trich is a defense mechanism secreted for survival.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3546740/
Every green plant uses photosynthesis to make all plant matter including thc. If you are having problems with light green plants under uv light then you need to up the ppm of the calmag+ additive. 6ml per gal seems to be my sweet spot under my full spectrum CoB, more may be needed for a stronger light ormore of it, Uv lights make every plant mag hungry and if you are in coco you also need extra iron.
Based on analyses of EST databases, it has been suggested that trichomes operate mostly as a self-supporting system [9] and have highly active biochemical pathways for both primary and secondary metabolism [9].

In glandular trichomes of tomato and tobacco, genes encoding enzymes and proteins related to photosynthesis and carbon fixation are significantly expressed [149,150], indicating that at least some of the carbon necessary for secondary metabolism can be fixed within trichome cells [22]. Earlier studies in cultivated tobacco had also indicated that glandular trichomes possibly can fix carbon and produce sugar and diterpenoids (i.e., duvatrienediol) independent from the rest of the plant, although a role for additional carbon imported from the tissues below the trichome cannot be excluded

to me this paragraph (i hope i'm not paraphrasing) means that you can't have one without the other.

i cut down my plants because the leaves were all used up and there was no chlorophyll producing carbon atoms. i guess that was the right move considering
carbon imported from the tissues below the trichome cannot be excluded which means to me if there is no carbon being produced by fan leaves the fixed atom in the trichome can't complete it's task in producing sugars. . . any thoughts or are we all on the same page?

then why let the leaves on your plants wither away at the end of the harvest instead of letting her produce photosynthesis at an optimal rate???
 
This chart is very useful.. if you understand what its saying hahaha. At sun rise and sun set the photons have to shoot through the side of the atmosphere and this blocks a lot of light due to particles and water (clouds) in the atmosphere. At around noon it is shooting straight down onto the surface of the earth and that is where the atmosphere is the thinnest. This is why we see our highest uv index around noon.
i was thinking about keeping my uva on 12 hours and the uvb 4 hours per day, would you disagree?
 

GT21

I like soup
Supporter
Based on analyses of EST databases, it has been suggested that trichomes operate mostly as a self-supporting system [9] and have highly active biochemical pathways for both primary and secondary metabolism [9].

In glandular trichomes of tomato and tobacco, genes encoding enzymes and proteins related to photosynthesis and carbon fixation are significantly expressed [149,150], indicating that at least some of the carbon necessary for secondary metabolism can be fixed within trichome cells [22]. Earlier studies in cultivated tobacco had also indicated that glandular trichomes possibly can fix carbon and produce sugar and diterpenoids (i.e., duvatrienediol) independent from the rest of the plant, although a role for additional carbon imported from the tissues below the trichome cannot be excluded

to me this paragraph (i hope i'm not paraphrasing) means that you can't have one without the other.

i cut down my plants because the leaves were all used up and there was no chlorophyll producing carbon atoms. i guess that was the right move considering
carbon imported from the tissues below the trichome cannot be excluded which means to me if there is no carbon being produced by fan leaves the fixed atom in the trichome can't complete it's task in producing sugars. . . any thoughts or are we all on the same page?

then why let the leaves on your plants wither away at the end of the harvest instead of letting her produce photosynthesis at an optimal rate???
You dont cut a plant filled with chlorophyll because its not ripe... just like many fruits we eat. The act of ripening brings out anthocyanins and this peaks antioxidants.
i was thinking about keeping my uva on 12 hours and the uvb 4 hours per day, would you disagree?
Run them both all day. There is not a light on earth that compare to the power of the sun. If we did have lights that powerful then i would say cut back a bit on the uv.
 
You dont cut a plant filled with chlorophyll because its not ripe... just like many fruits we eat. The act of ripening brings out anthocyanins and this peaks antioxidants.

Run them both all day. There is not a light on earth that compare to the power of the sun. If we did have lights that powerful then i would say cut back a bit on the uv.
i'm on a school bus, a good one :smoking:
 
I was just looking today for cob led white full spectrum and the only thing I found was a shop light, 6400k. it sounded ok for veg. where are vou finding yours buddy?
 
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