WeedRyder
New Member
realy one of the best scrogs i've seen lately, good job + rep
Munki's Ebb n Flow 3 x 3 SCROG 400W HPS Grow
- Thread starter Munki
- Start date
Those girls are getting fat! Nice work! 
looking 
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- #404
Still doing reading on the topic. On that same site, though I did get to it from a rather circuitous route, I found a very good article that did test my particular florescent tube.
UV Lighting for Reptiles: A new problem with high UVB output fluorescent compact lamps and tubes?
It deals with a problem reptile owners started having a few years ago. A condition called "photo-kerato-conjunctivitis" started showing up in vet offices. The poor animal's eyes were swollen shut and they developed cataracts. In extreme cases, the animals stopped eating and died. Turns out that though many modern UV floro tubes did not put out a very high overall UV amount, they did put out a higher percentage of their emissions in the specific and narrow UV wavelengths that are considered to have photobiological activity, AKA UV index numbers. When compared to the natural sun which has a UV index less than 2 when measured at 100 uW/cm2, my lamp's UV index was measured at 13.4 at the same 100 uW/cm2 reading!
Wow! That is for their fixture that has one tube in it. Mine has two, so Andy you are right. I will need to tread carefully; glad I only did the 20 minutes, 3 times a day. No noticeable damage to the plants when I checked this morning.- Thread starter
- #405
Thanks for the kind words and encouragement everyone.
Andy, thanks for the soil post. I'm not looking to design my own soil (yet) but this would be great for our gardening outdoors next year. I'll have to do this sometime in the future. Since my soil grow will be rather small, I'll use the FFOF for it but would it be better to mix all the admendments into the soil ahead of time or are they added as the plant matures by working them into the top inch or two of the soil in the pots?
Andy, thanks for the soil post. I'm not looking to design my own soil (yet) but this would be great for our gardening outdoors next year. I'll have to do this sometime in the future. Since my soil grow will be rather small, I'll use the FFOF for it but would it be better to mix all the admendments into the soil ahead of time or are they added as the plant matures by working them into the top inch or two of the soil in the pots?
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- #406
If you are mixing soils like FFOF that already has a light charge, with other amendments, then you should let them "cook" for a bit to allow those organic amendments to break down and for the pH to stabilize. The soil is ready when pH is ~6.3. Preparing soil in this manner is better suited for a longer veg, and bigger pots before flower. Hot soils, like the one I linked, are not for clones directly, but rather intended for established plants to be transplanted into with a little base potting soil in between.
However, if you are using OF for clones, with no/quite veg, and basically flowering, then you can fertilize throughout by adding nutrients of your choosing as needed. I've been drawn to prepping ahead of time in an effort to make things more simple.
I don even know if that answered your question...
Heh.
Well the little ones are in 2 1/2 quart containers under 24/0 of a couple of 27watt 5500k floros. In a few weeks, I can move them to the big tent. They may get too big by then though; I'll have to watch them. Don't have enough time to make a good "supersoil" so I will need to add nutrients later on in flowering. I would prefer to use a more organic fert instead of my GH flora series for this. Also, I'm unsure what would be good to use as the large flowering pots.- Thread starter
- #407
hapgrowy
New Member
congrats on post 420.... ur ScrOG looks great!!!
+rep if i can
+rep if i can
munki, i love the uv test. i want to see if it works, i have read about the benefits as well.
you know what puzzles me though? weed is a photoperiod flowerer, which means it wont flower untill late in the season. most of the trichs are mad when the sun drops low enough in the horizon, that there is only 13 hours'ish of daylight. but when the sun is lower in the horizon, the light has to travel through more atmosphere. atmosphere scatters light, in fact it scatters higher energy light more than low energy, thats why the sky is blue, and sunsets are red, when the sun is low only the low energy reds can cut through the atmosphere.
so it seems to me, by the time the plant starts to make tric's the sun isn't really hitting it with intense UV, rather it is hitting it with enhanced IR.
my reasoning may however have some flaw i can't think of right now, or there may be some other reason UV could stimulate resin production.
i am interested to see the results.
nice twist bro.
you know what puzzles me though? weed is a photoperiod flowerer, which means it wont flower untill late in the season. most of the trichs are mad when the sun drops low enough in the horizon, that there is only 13 hours'ish of daylight. but when the sun is lower in the horizon, the light has to travel through more atmosphere. atmosphere scatters light, in fact it scatters higher energy light more than low energy, thats why the sky is blue, and sunsets are red, when the sun is low only the low energy reds can cut through the atmosphere.
so it seems to me, by the time the plant starts to make tric's the sun isn't really hitting it with intense UV, rather it is hitting it with enhanced IR.
my reasoning may however have some flaw i can't think of right now, or there may be some other reason UV could stimulate resin production.
i am interested to see the results.
nice twist bro.
BWC BayArea
Member of the Month: 3rd Place Winner
Excellent post dunno how valid the info is. Sounds logical tho. I love a thinker. + rep if I can. So muniki U got the light up and running yet? What are the dangers of UV lighting for humans? What precautions should be taken if one were to make a similar venture?
I agree with this, i was just thinking of how its done in nature and how that relates to recreating it or enhancing it.
even in equitorial regions the sun moves up and down in the sky, and when the days are shortest, thats when weed buds and gets frosty, and thats exactly when the UV is least powerful.
could be that's a benefit to it for flowering in short days, it doesn't have to defend itself as hard from uv. . . could work great for all i know.
just thinking.
your weed will have a nice tan, thats for sure. lol.
I agree with this, i was just thinking of how its done in nature and how that relates to recreating it or enhancing it.
even in equitorial regions the sun moves up and down in the sky, and when the days are shortest, thats when weed buds and gets frosty, and thats exactly when the UV is least powerful.
could be that's a benefit to it for flowering in short days, it doesn't have to defend itself as hard from uv. . . could work great for all i know.
just thinking.
your weed will have a nice tan, thats for sure. lol.
Plants native (or naturalized) to equatorial regions, especially high-altitude areas, have mechanisms in place such as less overall chlorophyl and more of something I can't remember the name of early on a Sunday morning (lol) that helps them survive in such an environment.
I wonder if there is a mechanism having to do with uv response over and above the general ones for defending against plant damage.
Or... (Just rambling) such a mechanism that is dependent on the ratio of wavelengths as well as gross amounts?
I've read a few times that "up to 80% of uv rays can travel through clouds, fog and haze."
But I also read (American Scientist) about a phenomenon called cloud-enhancement; that they have measured uvb on overcast days to be as much as 29.8% above modeled clear-sky levels.
Code:
https://www.americanscientist.org/issues/pub/sunshine-on-a-cloudy-day- Thread starter
- #413
Awesome guys! I'm liking the discussion and am glad we can get one going here at 420 mag. There are no known tried and true rules with UV and Cannabis yet so it is an exciting area to work in. The main problem will be in getting consistent equipment to work with. No one is making cannabis specific UV bulbs at this time so we have to re-purpose equipment on the market.
In the areas where the weed grown consists of high THC and low levels of CBD, UV radiation levels tend to be high. There is a causal suggestion that CBD is produced by the plant and released into the trichome but UV radiation is either the necessary or primary method to convert the CBD to THC.
In the areas where the weed grown consists of high THC and low levels of CBD, UV radiation levels tend to be high. There is a causal suggestion that CBD is produced by the plant and released into the trichome but UV radiation is either the necessary or primary method to convert the CBD to THC.
CharlieMopps
New Member
It has always been a belief of mine that more light will grow a bigger faster plant, but using a full spectrum of light will produce better potency.
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- #415
I see myself heading in that direction. I eventually plan to specialize in indoor sativas, so recreating the sun's spectrum appears to be important. I foresee building a light array that includes HPS, MH, and UV lamps. Still a distant dream, but I can envision it.
this would def explain how UV could help
this is because even though they are traveling through clouds (light cloud cover), when the sun is high (11am-3pm) the volume of atmosphere it has to travel through is still small as compared when the sun is low in the sky. and even though there are clouds, they dont absorb much uv,
i have heard about this too, but i read that it is Haze, not exactly clouds, in the atmosphere that can increase UV radiation exposure.
here is a little bullet point list from WHO
Emissions from the sun include light, heat and UV radiation. UV radiation reaching the Earth's surface is largely composed of UVA with a small UVB component. UV radiation levels are influenced by:
* Sun elevation: the higher the sun in the sky, the higher the UV radiation level.
* Thus UV radiation levels vary with time of day and time of year.
* Latitude: the closer to equatorial regions, the higher the UV radiation levels.
* Cloud cover: UV radiation levels are highest under cloudless skies but even with cloud cover, they can be high.
* Altitude: at higher altitudes, a thinner atmosphere absorbs less UV radiation.Ozone: ozone absorbs some of the UV radiation that would otherwise reach the Earth's surface.
* Ground reflection: grass, soil and water reflect less than 10% of UV radiation; fresh snow reflects as much as 80%; dry beach sand about 15% and sea foam about 25%.
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- #417
Hey, thanks for helping me stay on the cutting edge. Loving it. Funny thing though. I was just reading yesterday about the degradation issues with traditional floro tubes. Trying to decide if multiple exposures of the UV per day is worth all the extra ON events the tubes will have to endure. Anyways, a guy there was discussing this kind of design and how it would be necessary to make a tube long lasting and highly resistant to the energetic state of being first turned on.
On another note, I found a good synopsis of a scientific paper on UV exposure to drug type Cannabis. Here is the link followed with the text reprinted here.
UV-B RADIATION EFFECTS ON PHOTOSYNTHESIS, GROWTH and CANNABINOID PRODUCTION OF TWO Cannabis sativa CHEMOTYPES
John Lydon* 2 Alan H. Teramura 1 C. Benjamin Coffman 3
1 Department of Botany, University of Maryland, College Park, MD 20742, USA 2 USDA-ARS, Southern Weed Science Laboratory, P.O. Box 350, Stoneville, MS 38776, USA 3 USDA-ARS, Weed Science Laboratory, AEQ. I, Beltsville, MD 20705, USA
*To whom correspondence should be adressed.
Copyright 1987 American Society for Photobiology
ABSTRACT
The effects of UV-B radiation on photosynthesis, growth and cannabinoid production of two greenhouse-grown C. sativa chemotypes (drug and fiber) were assessed. Terminal meristems of vegetative and reproductive tissues were irradiated for 40 days at a daily dose of 0, 6.7 or 13.4 kJ m-2 biologically effective UV-B radiation. Infrared gas analysis was used to measure the physiological response of mature leaves, whereas gas-liquid chromatography was used to determine the concentration of cannabinoids in leaf and floral tissue.
There were no significant physiological or morphological differences among UV-B treatments in either drug- or fiber-type plants. The concentration of Δ9-tetrahydrocannabinol (Δ9-THC), but not of other cannabinoids, in both leaf and floral tissues increased with UV-B dose in drug-type plants. None of the cannabinoids in fiber-type plants were affected by UV-B radiation.
The increased levels of Δ9-THC in leaves after irradiation may account for the physiological and morphological tolerance to UV-B radiation in the drug-type plants. However, fiber plants showed no comparable change in the level of cannabidiol (a cannabinoid with UV-B absorptive characteristics similar to Δ9 THC). Thus the contribution of cannabinoids as selective UV-B filters in C. sativa is equivocal.
(Received 29 August 1986; accepted 24 February 1987)
Note: Check out the city where legal weed is grown in the US ... Stoneville! :rolleyes3
WeedyMcWeedWeed
Well-Known Member
that sulfur plasma looks like itd be the champ if it was available and somewhat affordable
and if you had 15-20 foot ceilings
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- #420
Here are some pics from flowering day 39. UV dosage has now been increased to 3 hours a day (1 hour x 3).
