10.0 Uvb Light

rabidnz said:

What about standard uv bulbs or black uv bulbs from the lighting supplier?

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Blacklights only put out UV-A... its not fully understood on how this will effect the buds but it does cause the stems to grow alot thinner than with a UV-B lamp - STELTHY

The commercial blacklight tubes are UVA as are those 400 watt HID blacklights used in disco's.

UVA has the same effect on the plants as actinic blue light. It will cause earlier oil production, reduced root growth, less stretch, and slower water use.

Blue is better than UVA for this as the plant can also use the blue for energy needs, UVA triggers the effects but does not feed the plant while doing so.

UVB triggers unique chemical interactions not duplicated by other wavelengths. Low dose UVB gave the same results as high dose UVA. This test was a success as I got effects from UVB otherwise unobtainable.

Not what I wanted though, this is sleeper bud, guaranteed to put you out. I smoke early harvest sativa just to avoid the sleepies. Dang.

topfuel29 said:

I've been using "Snow Storm" its made by humboldt,to increase my trichrome production.
the stuff is sorta expensive, but it works really good.
use it as a foliar spray and apply it to your flowering plants one time a week for about 3 weeks.
you can make the bottle last by doing it this way.
the buds, and the secondary leafs will be totally covered with trichromes.
The UVB does work, but its light coverage is just to weak to get all over my plants.

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that may be, but using humboldt county's own snow storm ultra, that's adding more carcinogens to your diet...carcinogens mutate cells...https://www.rollitup.org/general-marijuana-growing/459639-warning-carcinogens-found-humboldt-countys.html

im ganna add some uvb for this run and i have ran the same strain for 4 generations now. I should be able to tell if it raised the thc levels or not. Ill post some pics and shit in a couple weeks. just threw three afghan kush specials in the flower room. Im ganna add the uvb bulbs in a week or two when buds start to open up. ill be back

Yu have a journal.??

stelthy said:

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Cfls don't really put off much light off their ends. Maybe consider turning those lights on their sides with a diy reflector perhaps? It just screams inefficiency to me. It seems to be working, everything looks amazing. We could all use each others input, hopefully mine helps.

karr said:

Cfls don't really put off much light off their ends. Maybe consider turning those lights on their sides with a diy reflector perhaps? It just screams inefficiency to me. It seems to be working, everything looks amazing. We could all use each others input, hopefully mine helps.

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CFLs are actually made to cast directionally downward. Weird eh? You need to slightly take into consideration restrike due to reflector size but take a look at these:


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GE's lighting diagrams correspond to these results as well.

Ye but those diagrams only work when the bulb is reflected. Without any reflection on the sides the bulb spreads the light horizontally (in vertical orientation). With the particular reflectors the light is going from the side and being pointed straight down. The problem with a horizontal setup is that type of reflector is reflecting the wrong angles. If you think about the dome shaped reflector a lot of the lit is being cast back at the lamp itself particularly along the 180 degree mark(straight horizontal). Compare this to a reflector that has no parallel reflection and I think you are comparing apples to oranges. A better designed horizontal reflector would help.

Now i would love to see the comparison of a cfl in vertical orientation (as shown in the quoted cabinet) compared to an even decently made horizontal reflector. The bare bulb will spread more laterally and spread more light up than so desired.

karr said:

Cfls don't really put off much light off their ends. Maybe consider turning those lights on their sides with a diy reflector perhaps? It just screams inefficiency to me. It seems to be working, everything looks amazing. We could all use each others input, hopefully mine helps.

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I have a few issues I need to address, I will be utilizing custom CFL reflectors.. I will also be up sizing my DWC tubs.. (The DWC tubs are currently only 10L - The above plant was grown in a single 10L pot..) .. I plan to add 2X 35L containers for my next mission I will also be adding 2 more UV-B lamps and an extra internal fan to blow the SCROG'd tops. I also plan to adjust the main reflector to sit bang! in the middle instead of slightly to one side... and lastly I am toying with the idea of upgrading from Diamond Mylar to Orca Film. ... On the bright side.. I Havest the above plant just before Christmas .. and that 1X DynaFem Royal-Haze gave me "17.5" oZ (DRY !!) and coinsidently I have been 'blitzed' every day including today.. .. and gues I will be bake for at least another 3 to six months (all percy) !!!

I was happy to hear your opinion and have given it some thought.. I will prob chill for another Month or so and then I'll get back to working on my Cab. I'll add a LINK to my thread so you can browse the last few pages and view the Harvest :-



https://www.rollitup.org/advanced-marijuana-cultivation/320402-stelthys-600w-hps-project-new-66.html




Please feel free to add comments etc... Enjoy! ~ STELTHY

karr said:

Ye but those diagrams only work when the bulb is reflected. Without any reflection on the sides the bulb spreads the light horizontally (in vertical orientation). With the particular reflectors the light is going from the side and being pointed straight down. The problem with a horizontal setup is that type of reflector is reflecting the wrong angles. If you think about the dome shaped reflector a lot of the lit is being cast back at the lamp itself particularly along the 180 degree mark(straight horizontal). Compare this to a reflector that has no parallel reflection and I think you are comparing apples to oranges. A better designed horizontal reflector would help.

Now i would love to see the comparison of a cfl in vertical orientation (as shown in the quoted cabinet) compared to an even decently made horizontal reflector. The bare bulb will spread more laterally and spread more light up than so desired.

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There is definitely problems with re strike comparing those two different reflectors but the lighting diagram is actually GEs own cast pattern of their 26w bulb with no reflector - surprised me as well when I got a hold of it but all the manufactures seem to have similar ones. If you look closely at spiral CFLs you can often see a coating on just one side of the tube which helps with directional reflection - this is not true of all spiral CFLs but many of them.

how long did you veg that for man, holy shit.

So I just harvested and I believe that the UV lights were the reason for the massive trichome production but I strongly discourage cfl UV lights due to bleaching. It was a real pain in the ass!

There was an article in HighTimes back in the mid 90s about UVB. I've been using it ever since. Once of my secrets of why my herb is on the more potent side. I usually start 2-3 weeks before harvest. I view as just another stressor. This along with water stressing (not watering until leaves start going limp) really freaks out the plant and it really revs up THC production and converstion. I don't know it for a fact but seem like the high is more psychoactive or something. I use two small 12 inch UVB bulbs. Since I flower under MH (higher UV) I don't need that much extra. Lots of Sativa growers flower under MH for this reason. If I find the article, I'll forward. Was really informative.

last year, for the first time i tried to grow a little indoors. i had a 128 x 3watt (actual draw about 256 watts) led light. tried 3 autoflowers. 2 autowappa and i jack herer auto. i was surprised to end up with 6 oz's (included all size buds). this year bought 78" x 78" x 78" tent and 240 x 5watt (draw about 720 watts). I read all about uv light increasing tricome production. so i see 12 x 1watt uv bulb. called the factory and had them make me a 12 x 3watt led bulb (for regular light socket). I'm going to give it a try/experiment . If you already know uv works email happen@bsled and tell him you want a 12 x 3watt uv bulb like the one adam had made. he'll know who and what you mean. I'm not endorsing this light as i'm just now going to try it out. any info or comments on uv lighting would be appreciated. adam bennett

cant believe i just read this whole thread, amazing what you can learn from the input of others... thanks guys

adam001 said:

last year, for the first time i tried to grow a little indoors. i had a 128 x 3watt (actual draw about 256 watts) led light. tried 3 autoflowers. 2 autowappa and i jack herer auto. i was surprised to end up with 6 oz's (included all size buds). this year bought 78" x 78" x 78" tent and 240 x 5watt (draw about 720 watts). I read all about uv light increasing tricome production. so i see 12 x 1watt uv bulb. called the factory and had them make me a 12 x 3watt led bulb (for regular light socket). I'm going to give it a try/experiment . If you already know uv works email happen@bsled and tell him you want a 12 x 3watt uv bulb like the one adam had made. he'll know who and what you mean. I'm not endorsing this light as i'm just now going to try it out. any info or comments on uv lighting would be appreciated. adam bennett

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Hey Adam, how did the 36watt UV bulb turn out? Did it deliver?

Still reading this lol