10.0 Uvb Light

murtymaker

murtymaker

Well-Known Member
I only have a Reptiglo 8.0. I am in my 2nd week 12/12 so I think I am going to put it on my light mover next to my 1000wHPS. It's a flour light with a reflector.

My question is, my 1000w is 2ft from the canopy how far should my 8.0 light be? Closer right? Thanks
 
spiked1

spiked1

Well-Known Member
murtymaker said:
I only have a Reptiglo 8.0. I am in my 2nd week 12/12 so I think I am going to put it on my light mover next to my 1000wHPS. It's a flour light with a reflector.

My question is, my 1000w is 2ft from the canopy how far should my 8.0 light be? Closer right? Thanks
Click to expand...
The reptile 10 globes say effective up to 20 inches, so 2 feet might be too far.
 
B

born2killspam

Well-Known Member
The reptile 10 globes say effective up to 20 inches, so 2 feet might be too far.
Click to expand...
The reptile bulbs have guidelines for marijuana supplimentation right on the box?? How cool is that!:)
Sorry, couldn't resist..
 
fatfarmer34

fatfarmer34

Well-Known Member
Here is an excerpt from a web site I found.
[0006]Early experiments analyzing solar UVB effects demonstrated substantially reduced photosynthesis, plant growth, and crop yield. However, these early experiments were performed under unrealistic spectral balances in that high levels of UV were used. In experiments employing balanced levels of UV radiation, UV-induced partitioning of carbon to production of secondary plant metabolites occurs. Enhanced UVB radiation stimulates production of phenolics and flavonoids that serve a protective role by accumulating in leaf epidermal cells and attenuating UV radiation before encounters of sensitive processes in mesophilic cells. Synthesis of bulk methanol soluble UV absorbing compounds increases by 10% following enhanced UVB radiation.
And here is the site. http://www.faqs.org/patents/app/20080298052
 
_secret

_secret

Well-Known Member
fatfarmer34 said:
Here is an excerpt from a web site I found.
[0006]Early experiments analyzing solar UVB effects demonstrated substantially reduced photosynthesis, plant growth, and crop yield. However, these early experiments were performed under unrealistic spectral balances in that high levels of UV were used. In experiments employing balanced levels of UV radiation, UV-induced partitioning of carbon to production of secondary plant metabolites occurs. Enhanced UVB radiation stimulates production of phenolics and flavonoids that serve a protective role by accumulating in leaf epidermal cells and attenuating UV radiation before encounters of sensitive processes in mesophilic cells. Synthesis of bulk methanol soluble UV absorbing compounds increases by 10% following enhanced UVB radiation.
And here is the site. http://www.faqs.org/patents/app/20080298052
Click to expand...
Ok great, but we're talking about marijuana plants that produce THC. Not your ordinary house plants...
 
fatfarmer34

fatfarmer34

Well-Known Member
-secret you dont think this is directly related to Marijuana? "Enhanced UVB radiation stimulates production of phenolics and flavonoids that serve a protective role by accumulating in leaf epidermal cells"
Plus this is further reinforcement as borntokillspam put it. [0009]A majority of plants show significant benefit from ultraviolet light. Many of these are economically important plants such as herbs, drug producing plants, ornamental flowers, and food crops, Benefits of UV light include increased immune responses, enhanced pigmentation and aroma, and altered plant architecture such as shape, flower number and volume, and thricome density.
 
spiked1

spiked1

Well-Known Member
Cyndrindale said:
It gets pretty hot. What I do is I use one 200w reptile sun lamp and rotate it over a new plant every day so they each get a little coverage. Yes UVB rays are dangerous but as long as you are not hanging out in the room for hours and/or staring at the lamp directly you do not have to worry any negative side effects.:blsmoke:
Click to expand...
That sounds more like an infrared heat lamp?
 
D

DaGambler

Well-Known Member
i've got 3 or 4 weeks before harvest... if anyone is interested in seeing if a Metal Halide used during the last 2-3 weeks of flowering will increase trichome production (via greater UVB output than a HPS bulb). the Metal Halide is a 1000w Conversion bulb. It is rated at 110,000 lumens and the spectral anaylsis seems to indicate that it does put out more UVB than a HPS bulb.

so anyways, it will be over approximately 1/5 of the garden. With flower production (HPS good) mostly complete... i hope to be able to differentiate greater trichome production on those plants under the MH Conv. bulb vs. those that stay under the HPS bulbs.

I may experiment with a few ReptiSun10.0 26w compact spiral flourescents another time.
.
 
listmann

listmann

Well-Known Member
Been using it for awhile. The uvb has no real affect on the plant growth. It does however have an affect on the Trichome production and density, as the trichomes absorb the harmfull uvb rays to prevent damage to the seed pods.

Also, be aware that while the 10.0 seems like a good choice in terms of UV-B, but wheni read up on it last, i stumbled upon several articles saying that the 10.0 doesnt quite cover the right light spectrum, and should be used with one or more 4.0 tubes. (In addition to your main grow lamp obviously :-D )

I Actually made some holes on each wing of my Adjust-a-wing reflector, where i mounted fittings for the uvb tubes, electric starter is placed along the back of the reflector. Works Great :weed: The light spectrum hitting the plants visibly changes when i turn on the UV-B Light's on the reflector
 
fourtw0

fourtw0

Well-Known Member
Currently using 4 10.0 UVB lights on during the whole 12 light cycle in flowering. Major difference in potency, much stronger.

I've been using them for a good couple months now.
 
weedyoo

weedyoo

Well-Known Member
as far as i am concerned this works everyone should try this. thanks to all for your help in testing this.,
 
C

Chemical

Member
I am on it... 6 Reptisun 10.0 26W CFL are on its way plus an Osram Ultra Vitalux

Later I will add a 10000k 400W MH

I can even get 20000k MH... I do not know if the 20000 can put higher % of UVB

Regards
 
dirt clean

dirt clean

Well-Known Member
The writer's own experience allow for a more specific conclusion: If the UVB photon is missing from the light stream(a), or the intensity as expressed in µW/cm2 falls below a certain level(b), the phytochemical process will not be completely energized with only UVA photons which are more penetrating but less energetic, and the harvested resin spheres will have mostly precursor compounds and not fully realized THC(c).

(a)Examples of an environment where the UVB photon would be missing from the light stream include all indoor cultivation illuminated by HID bulbs and in glass or corrugated fiberglass covered greenhouses.

quartz glass will let the uvb thru but otherwise that mh light uvb will be blocked. I read this.

I copies the first part from the net. Posted it somewhere else. I read almost all the thread. I forgot I skipped a few pages, lol. Nice read.

I just got a uvb 10. 15 watt flouro for my three trees under a 600 hps. I have a fixture for another. They are about 18 inch bulbs I have in old blacklight fixtures.

I cant wait.

Also I am running a 400 mh with no glass for a few days as another cooltue is in the mail and I have to ask if anyone else has done this to the tune fo massive migraines and headaches!!! I mean bad. I mean my morphne is helping my head aches some, only some. lol. No prob with glass one previoulsy. Just when I look in the tent I will soon be bad upsatirs. I have had this for a week like this and now almost all light is pissing me off. I am wearing sunglasses inside, rofl.

so good luck all.
 
tahoe58

tahoe58

Well-Known Member
a recent review has a good summary of some of this science to this. FYI - The effect of ultraviolet radiation on the accumulation of medicinal compounds in plants Fitoterapia, Volume 80, Issue 4, June 2009, Pages 207-218 Wen Jing Zhang, Lars Olof Björn
 
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