RM3
Well-Known Member
Not ALL but MOST
Adding UVB spectrum to COBs - opinions on this setup?
my tent is small, 2.5' x 2.5' - i dont think hanging a T5 is an option for me as would probably get in the way of my COB fixture and it seems the smallest of these T5s are about 22 inches
So would it be feasible to maybe put it vertically in 1 corner and move it around each day or something?
So would it be feasible to maybe put it vertically in 1 corner and move it around each day or something?
researching
Well-Known Member
You could always go with the "lizard light" flouros. Those I believe do not need to be so far and could be mounted on most cob fixtures. I was leaning towards a "lizard light" but after seeing and reading about these agro lights got me excited for them.
You always have that cfl option. I am nor sure how well they work though. Its funny because I have been looking on alibaba because i was thinking of building a couple uvb led bars to add to my cob fixtures and came across a cfl posting that said great for eyes.... lmfao. Lets just SEE how well that works out!
cool man - in the other thread i linked there are figures of 150-400uW/cm2 mentioned for UVB to be of noticeable effect - now i dont know how those figures are arrived at but i dont think CFLs will achieve that level unless inches away from plants
thats one thing i was hoping to get from this thread, an adequate level of UVB but i guess more testing needs to be done
I will probably go with a T5 or 2 and rig them up and see what happens
researching
Well-Known Member
lichip.en.alibaba.com has or shows broad spectrums of chips. I was thinking uvb and far red. My concern is the wattage.
researching
Well-Known Member
Like most things debatable in this hobby I believe it doesnt hurt to try things as long as we go about it in a logical safe way. And by debatable I mean flushing and darkness before chop
What I dont understand is why people think the elevation and latitude a strain evolved at is an argument for increasing UV leads to higher THC.
If anything that would mean genetics play a bigger role than given credit. And it would also likely mean that different strains may have markedly different reactions to UV light.
If anything that would mean genetics play a bigger role than given credit. And it would also likely mean that different strains may have markedly different reactions to UV light.
Abiqua
Well-Known Member
it goes without saying...hell two clones taken at the same time from the same mom and flower will have unique profiles. Let alone two different pheno's or cultivars.
Some say 20% genetics/ 80% environment, but that isn't some rule of biology, lol.
MeGaKiLlErMaN
Well-Known Member
Since uvb is never static in sunlight itself, my belief is that you need little to none.
Why do non UVB cob flowers always get the raves?
In fact, so little is known about positive benefits of UV light versus the actual downside, we tend to be dismissive to say the least.
UVB was shown to increase certain terpenoids, not in cannabis, and then correlated to say as much...yeah Right. Most data seems to show a damage factor around every bend. Mechoulam proved that THC alone, doesn't get you high. So what is uV and uvb spectrums doing to the other 99 or so cannibinoids, flavonols and terps, that we have no clue about?
The UV thing is way over played with such little data
Something else to consider is that according to the DE HPS bulbs output of UV Its less than .5% of its total power output.. putting UVA and UVB at around 2.5W over a whole canopy. I might not even see a 2.5W light after using COBs... Anyways thats just a thought.
Growers House source:
http://growershouse.com/images/DE_TEST_INFOGRAPHIC.pdf
researching
Well-Known Member
I think there is a correlation at least in regards to resin production. Since we all know that resin is there to protect the plant. So it goes or so it is assumed that with intense uv and how damaging it can be that resin production should increase to act as a "sun block".
As a quasi similar example take jasmonate (a pgr). It tricks the plant into thinking that it is being attacked by bugs amd thereby is supposed to increase resin production to aid in its defense.
I have not tried jasmonate, but intend to. Especially because I live in a region with a lot of sagebrush which jasmonate naturally occurs. I plan to make a tea and see.
Yodaweed
Well-Known Member
UV definitely increases tric production AND essential oils, so it will get you higher AND taste better. It does this by producing a response in the plant thinking it is under attack, which triggers the plant to defend itself, producing more cannabinoids, trics , and oils.
MeGaKiLlErMaN
Well-Known Member
ah you found it! lol So you might use them after this huh?
Yodaweed
Well-Known Member
A metal halide light produces UV-B light if you remove the glass from your reflector and you don't need to hang them so low you can put them between HPS , that's what I do in my HID grow and in my LED grow I use an LED with a UV-B dongle 18% UV-B light.
researching
Well-Known Member
Copycat lol! J/K
difficult to tell much from that source
You should definitely publish your research. It would certainly move along the debate.
Abiqua
Well-Known Member
Thanks....but i don't follow?
Yodaweed
Well-Known Member
Defense ProteinsYou should definitely publish your research. It would certainly move along the debate.
When plants are hit with ultraviolet light, this event triggers the plant's defense mechanisms. The plant then becomes more resistant to insect attacks as it releases 15 defense proteins. The ultraviolet light also affects message pathways that impact plant development, growth and metabolism, according to Washington State University. The ultraviolet light tricks the plant into thinking that it is wounded, which occurs when the plant is being feed on by insects. However, the ultraviolet radiation does not help the plant compete with weeds, according to Plant Cell.