UVB bulbs...

[Rusty Trichome]

Camera batteries took a dump, but I got some fresh being charged-up right now. Should be able to post pix tonite or tomorrow.

But, I have been searching for an optimum distance and schedule range on both, sativa and indica doms...

I've been keeping the light on 9 hours a day without a disister.

With my sativa dom (Swazi Skunk) I've found they prefer some distance between light and leaf. At 4 inches...heat stress. At 6 inches from plant, some stunting of vertical growth is evident, yet same indicators of trichome growth and foliar 'aging' as my other post regarding the indica dom.

The light somewhat affects the other buds that are further than the 6 inches, but at a lesser rate. This includes, of course other plants within an 8 to 10 inch distance, or so.
Also, just because one part of a plant get's UV, this doesn't mean the other side of the plant is responding in kind. Buds that are not directly in the light, do not seem to reap the benefits like those I'm targeting. Hmmm...perhaps an example...:
Bud 'A' is 6 inches from the lamp. Bud 'B' is on other side of the plant, permanantly shaded from the UV light. Bud 'B' will not show the UV effects like bud 'A'.

Since the light spread from the UV bulb is similar to a CFL, (doesn't go far) I'm planning on getting a 4' fluoro tube UVB light, to spread the UV over a larger sample. Testing one or two branches at a time is for the birds...but I like the effects I've been seeing so far.

 

[Lazyman]

Bump to the top for good data

 

[Tactical Farmer]

finally got to hook up my 4X54W T5HO with the "rare earth phosphorus" bulbs.

http://advancedtechlighting.com/philipspricolor.htm

Went with 2 green 1 red 1 blue - makes a cool rainbow color on the leaves.

Sorry its BRIGHT

Would like to add something different in the middle of the 2 400W CMH but cant decide ?

 

[organiclover]

i found this Metal halide UVB bulb with external ballast
looks interesting

http://www.reptileuv.com/megaray-metal-halide-uvb.php

 

[sunnydog]

i found this Metal halide UVB bulb with external ballast
looks interesting

http://www.reptileuv.com/megaray-metal-halide-uvb.php

I used several of these.
As I have stated, I do not believe any worthwhile improvements were noted.
They are collecting dust.
Believe me, if I thought they were worth anything, I would run them.
But ,sadly ,they don't do shit.

Good luck!
SD

 

[Bhodi_22]

...scientific proof for that because I know leaves and stems even from a plant in vegetatie period have cannabinoids and there are NO trichomes. Some people in northern countries where you can't make it into budding outdoors do just that - grow lots of foliage to use later in solvents. You can imagine it is far from connoisseur grade smoke but gets you high just like buds would.

You could test it:

Yup an' Yup

I've seen virtualy identical honey (same process) made from everything from straight veg fan leaves and stems to high potency bud, keep your contact time short you fluid cold and it'll pull what you want from any thing...we've been joking about doin' it with local hemp but that would probably be a stretch ...in theory it would concentrate the tiny amounts of cannabinoids but yeah right...in theory a lot of things appear true!!

 

[Bhodi_22]

go figure its like 5 hours past bedtime - I'm kind of baffled how my post came out of something that started about UVB spectrum lights...duuhhh

but to the guy who said screw it to what they did in the 70's using the uvb and incandesant to simulate before the sun and after the HID goes off...sounds brilliant to me...call me crazy but I've been day dreaming about simulated moonlight in the dark period!

 

[trichrider]

you were caught up in it too?
yeah interesting topic, but four hours of reading for no decision...hmnnph
won't stop me from hanging one over the girls to get a look-see myself.
ever snooping for better results.
thank you.

 

[Andyo]

sylvania MS 1000w excess uvb

sylvania MS 1000w excess uvb

well i saw this thread a little late.Ive read all of it.
Sylvania MS 1000w MH bulbs theyve been about for 20 years plus
They have exccess UVB and are rated enclosed obviously the glass enclosure plate will stop the uvb.
Ok i used these for 20 yrs unenclosed and my pickers were getting tanned down oneside .
Ive moved to thailand i cant get these lamps or ballasts here ive gone with 1000w hps and 400w MH 6,5 k and 8k for extra blue .50w per square ft
the dont come anywhere near the sylvania
More proof .sylvania,s new version of this lamp is pulse start theyve put a uv filter round the arc tube "reduced uv" lol
The final proof is i have had skin cancer right arm right side of face.
My right arm and right side of my face always got the light as i reached into the bays.A

 

[Dopeboy668]

well i saw this thread a little late.Ive read all of it.
Sylvania MS 1000w MH bulbs theyve been about for 20 years plus
They have exccess UVB and are rated enclosed obviously the glass enclosure plate will stop the uvb.
Ok i used these for 20 yrs unenclosed and my pickers were getting tanned down oneside .
Ive moved to thailand i cant get these lamps or ballasts here ive gone with 1000w hps and 400w MH 6,5 k and 8k for extra blue .50w per square ft
the dont come anywhere near the sylvania
More proof .sylvania,s new version of this lamp is pulse start theyve put a uv filter round the arc tube "reduced uv" lol
The final proof is i have had skin cancer right arm right side of face.
My right arm and right side of my face always got the light as i reached into the bays.A

I use 1000 watt hps an 1000 mh hung verticle side by side ina stadium. I was in my rooms last month harvesting for about 6 hours straight an when I came out my face an neck were burnin. I was smokin so I didnt really feel the pain. lol. Bout 3 days later the whole side of my face an neck peeled. This is in december in the north. I hada spend a week in the house so I didnt have to explain why I had sun burn on one side of my face. It sucked. lol.

 

[sunnydog]

So.........

So.........

Has ANYBODY??? found these to have any REAL (not theoretical)value.....As in, Is this worth doing??


I vote NO!!!

SD

 

[messn'n'gommin']

Has ANYBODY??? found these to have any REAL (not theoretical)value.....As in, Is this worth doing??


I vote NO!!!

SD

There is a link to a paper done in 1987 that may have some relevance...found here:
“This is a gold mine of cannabis growing laboratory research,” by LJB
https://www.icmag.com/ic/showthread.php?t=127379

Spurr has put up links to several good papers on UV starting at post #160 in this thread (located in the Cannabis Botany and Advanced Growing Science forum).
“UV Light and Terpenoids,” by GreenintheThumb
https://www.icmag.com/ic/showthread.php?t=139726

hth

 

[clongo]

confounded studies

confounded studies

There is a link to a paper done in 1987 that may have some relevance...found here:
“This is a gold mine of cannabis growing laboratory research,” by LJB
https://www.icmag.com/ic/showthread.php?t=127379

Spurr has put up links to several good papers on UV starting at post #160 in this thread (located in the Cannabis Botany and Advanced Growing Science forum).
“UV Light and Terpenoids,” by GreenintheThumb
https://www.icmag.com/ic/showthread.php?t=139726

hth

these studies are bunk because they were done without considering the emerson effect and temperature differentials during the night, both of which affect potency greatly. phytochromes and cryptochromes uvb reptile bulb enhancement is because of a wider range of the very blue/ violet spectrums. plants seem to finish faster because the uvb turns the resin heads amber because it is degrading the thc somewhat, perhaps lending itself to a more complex high

 

[messn'n'gommin']

That is the main reason for the increase in THC levels, to replace the degraded molecules. You do take a hit in yield, but for a 2X4 closet, I'm not out for yield, I'm out for quality.

The plants can also can be induced to produce THC through dessication, pathogenic, and herbivorous attack.

 

[jgrow]

tagged.

 

[Heyoka23]

the red and the blue

the red and the blue

I spent much tme reading but got tired of some of the squabling about midway thru and jumped to the end. Sorry if that makes me a douche bag but anyway....

That marijuana optics paper mentioned "The extent to which this production is also influenced by environmental UVB has also been experimentally determined by Lydon et al. (1987)"

I'm interested to know if anyone tracked down the Lydon experiment paper?

Also:

The paper on marijuana optics also mentioned some things on red light and far red light creating phytochromes that are responsible for affecting the flowering response. Does anyone know if the phytochrome response can be triggered with just a little bit of red? I guess I'm assuming that the higher frequencies are more energetic and provide the plant with more energy for producing plant bulk and then I'm wondering if we could get the flowering response with lower quantities of red light (intensity or duration) while still dosing it with the energy of the higher kelvin MH's.

 

[caniremember]

Would like some info regarding how long lights should be on, when in the flowering cycle should uvb's be turned on, and recommended output of lamps (is 50 microwatts/per second cm2 ok?)
Thanks

 

[LEDfoot]

Interesting thread. A new member made a post here, bumping it to New Posts--but there is no post?

 

[dontstepongrass]

nice to see this thread is still chuggin along!

 

[GET MO]

Bump for 2020! Theres has to be some side by sides with the uvb supplement somewhere...