Introducing UVB during peak daylight hours

[mmad]

I've read that it has wonderful results on THC/Cannabinoid/Resin production. Anyone have any experience? I'm about to try it out..

[Guest Da-Collie-Man]

ow...never heard of this...would love to see some results

[kdstanhope]

When you put it like that drunk, it does make sense... plausible I'd say, although I'm sure there's a downside to the procedure... Maybe hermies, mutations. Someone needs to conduct a controlled experiment.

[Romeu9]

I think you wont need to go that way, if you have lets say, a digital ballast and top notch bulbs and reflection...

But its good to learn from experiences..

Take care

[alexbiologo]

I´ve heard of ultraviolet incresing thc production. But Dont know if its true. Never read any test.

[mmad]

I'm pretty sure that the manufacturers have taken out the UVB range due to health concerns,

UVB and UVC, which are responsible for the direct DNA damage that leads to skin cancer.

The MH do seem a lot less blue then they did years ago.

I find it hard to suggest to anyone something that can harm them, I'd imagine that's why there's not

much published on the issue. Regardless, the UV in high altitudes and near the equator range between

10 and 16 so depending the the varieties origins, I'll hang the lamp the apropriate distance from the canopy

after determining the radiation at that level.

On another UV related note, UVc(?) is whats used by food manufacturers to eliminate mold etc

somewhere along the final production stages. May be useful for sensitive strains that have a hard time with

parasites or other undisirables..

Heres's a useful map to give you an idea the strength of UVB needed depending what you're growing,

after taking aquick look I am beginning to suspect that the strains reputed to have THCv are from regions

that the UV reads at an astonding level of 16.

[Flail]

any more thoughts on this topic?

[lamsbread]

This is something that I have recently looked in to, when it comes to THC production what you want is UVB.

UV lights are available in tubes, available in T5 and T8 and as compact Flourecents.

UVB is also to some extent given out buy MH HID’s.

UVB is has a relatively short wave length and is not able to pass through most glass and plastic roofing materials found in conservatories and green houses.

Uv lights often use specialist glass to allow the UV through.

When aUV light has a number on it for example 5.0 or 10.0 this the percentage of UV light that the specific Light outputs.

UV needs to be treated with caution, always cover arms and wear UV eye protection if you are to come into contact with it.Prefferably turn of the light before entering the room with either an external swith or with a remote control wall socket.

UV light are often used in the peak hours of a 12/12 lighting regime for approximately 5 hours, though some growers leave the light on for the full 12 hours.

When you start using the UV light in you bloom phase it is advisable to start at a higher height as the plant needs to become accustomed to theUV. If this is not done you risk damaging your plant.

Being that the UV is a relatively short wave length and that tubes and cfl have a short throw intensity it is recommended that once your plant is used to the UV, a height of approximately 12â€/30cm above your plant canopy is about right.

• UV-A: 320-400 nm
  
• UV-B: 280-320 nm
  
• UV-C: 200-280 nm
  

• UV-A : used for party lights and bank notes etc
  
• UV-B : used for THC production and sunlamps
  
• UV-C : used for sterilizing medical equipment for surgery and for destroying pathenogens in air con and destroying pathenogens and algy in aquariums and ponds.
  

• UV-A : relatively harmless unless extended periods of exposure, when it is advisable to use some protection
  
• UV-B : Protection should always be used, cover skin or use high factor UV block and always use UV eye protection
  
• UV-C : You should not ever come into contact with UV-C it is incredibly harmful
  
• 
  

UV-A and UV-B are used in aquariums and terrariums and are used for corals and reptiles.

Stores that cater for these environments will stock UV lights.

That’s all I can remeber for the moment, I probably think of some more later but there is plenty of reading to follow.

The next article is copied and pasted but I don’t remember where I sourced it.

There are some very useful links at the bottom of the page.

WHY IS THIS NOT COMMON PRACTISE?????

MAKE MORE THC........

& my next experiment#

I started to think about THC again... a previous post had theory about dose watering leaving it on brink of water starvation....... which is not a bad theory in all just alittle off.....

IMO it will induce the hormone ABA in which the plant will stop growing ands protect it self ..... it will think its in drouhgt. But this is not nesseceraly a bad thing as my first thought was (less yield)... I dont think this method would work BUT was aong the right lines.....

So I continued to do my research in why MJ produce THC... I have come across many reasons of why & how`s the MJ plant produces THC: like to spread seed by sticking to fur,scraping make it think its dieing,types of fertz & poop,rusty nail through stalk and man more carck theories...

this just made me laugh with some of the shit stated....

So this is the theory : it comes down to Environmental Influence again........ The best way to take a look at how environment affects THC production is to look where on the planet cannabis has naturally adopted a high THC profile. As cannabis has spread around the world it has taken on many different traits to help in its adaptation to varied areas such as africai, south america,vietnam,etc.

ULTRAVIOLET (LACK OF ....HID HAVE NO UVA UVB)

The best drug varieties have always been found at equatorial or high altitude locations. The one thing which both of these variables have in common is high light intensity and a large amount of ultraviolet (UV) light in the spectrum.

Recent Swiss trials in outdoor plots of clones grown at different altitudes have shown that there is correlation between higher altitude and increased potency (although there seems to be a trade off in yield).

This likely means that THC-rich resins act to protect the plant and its seed from both higher light intensities and ultraviolet presence. It's no surprise that cannabis has developed a chemical to protect itself against the Sun's damaging UV rays, as they can be injurious to all forms of life.

Therefore a high-THC plant grown in a low THC environment will likely produce a medium THC result.

Humidity also plays a role in plant resin production. Although some potent equatorial strains do seem to occur in high humidity areas, most high in thc -tested strains have evolved in drier areas, like Afghanistan. The aridity of the areas of Afghanistan where Indica strains have evolved is quite apparent by the trait of large dense flower clusters.

There are many examples of non-cannabis plants producing resins in order to protect themselves from drying out. The waxy coating on cacti and other succulent plants is a prime example.

marijuana flowered in humid conditions will often have a longer stalk on the glandular trichome than the same strain grown in drier conditions. While this may give the appearance of being very crystallized, it will likely contain less THC than the same plant grown in a drier environment. Another problem with longer trichome stalks is that the gland heads are more likely to break off during handling.

This is probably why AN outdoors high so much BETTER when you get good genetics..

Experiment:

IM Buying a aquirium light tomorrow! & humidity to around 60%

This will be easy to compare THC for I have smoked the same bud for yrs!

I will run the light for around 5hrs of the light cycle for the last 3 weeks of flower.

note: UV can kill your plants by burning them...

file:///C:/Users/tim/AppData/Local/Temp/msohtmlclip1/01/clip_image001.jpg

Catalina 5000k - UVA/UVB 55w

$ 30.00

combinations and distance is the nxt challenge:

a combination of 55w 1meter away and this one up close..

file:///C:/Users/tim/AppData/Local/Temp/msohtmlclip1/01/clip_image002.jpg

Compact Germicidal UV Lamp (15W, 25W, 23W)

Product Description

Compact UV Germicidal lamp, Double H shape / Single H shape

Material: High Purity Quartz Glass

Voltage: 110 to 230V AC

Wattage: 15W, 25W, 23W

Base: E27 / E14

Lamp diameter: 12mm

Peak: 253.7nm / 253.7nm+185nm

Average life time: 8, 000hrs

Feature: Compact and mini size, easy to install, external ballast is not needed

Applications: Easily installed in table lamp as a portable sterilizer for Kitchen, Bed room, Office, Elevator, etc.

Trademark:CnlightModel: 15W, 25W, 23WCompany:Cnlight Co., Ltd.

-------------------------------------------------------------------------------

I have found a breakdown of the light spectrums givin out by uva uvb lights for reptiles....

The "photobiological activity" of a lamp: measuring the UV Index

http://www.uvguide.co.uk/phototherap...-tests.htm#UVI

the conversion betweenwatts vs UV vs nm

this will be helpfull to figure out what light

I will ramp this up slowly - probably up to a 4 globe setting with 6-8hr period... or untill the plants tell me ENOUGH!

pLACES TO FIND THESE LIGHTS

SUN TANNING, INSECT ATTRACTION,REPTILE, AQUIRIUM

Forensics, , psoriasis, polymerization, , Dermatology, Night Clubs

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THIS IS WORTH WATCHING!!!!!!!!!!

Here is the best Youtube vid on the subject and a really good watch, about 15mins, Old school dude but proffesor like stoner... if I have not convinced you he will....

THC, UVB and Me - unfortunately no longer on youtube. If anyone has a copied or knows how or where to get hold of this video please share!

Some examples of HIGH THC producing areas and ther UV index

Country (City) . J F M A M J J A S O N D

Brazil (Rio de Janeiro) 23°S 12 11 9 7 5 5 5 7 9 10 12 12

Kenya (Nairobi) 1°S 12 13 13 12 11 10 11 11 12 12 12 11

Vietnam (Hanoi) 21°N 6 8 10 11 11 11 12 12 10 8 6 6

Cuba (Havana) 23°N 6 8 9 10 10 11 12 11 10 8 6 5

Panama (Panama) 9°N 9 11 12 12 11 11 12 12 12 11 9 9

& for comparison

Australia (Sydney) 34°S 9 9 7 5 3 2 3 4 6 7 9 10

Australia (Darwin) 13°S 12 13 12 10 8 8 8 10 11 13 12 12

USA (Los Angeles) 34°N 3 4 6 8 9 10 10 9 7 5 3 2

USA (New York) 41°N 2 3 4 6 7 8 9 8 6 3 2 1

So it seems that good pot outdoors is grown in the range of about 25 degrees either side of the equator.... so there is room for experiments..

My nxt problem the conversion

exposure to the B-band of ultraviolet light (UVB), light at a wavelength of:

270-315 nm is about where coral and reptiles grow the best; and the range Proffessor stoner said was aroun 270 - 300 nm so my range is in there somewhere.............

The light I have suggested is around 350nm - at 1 foot so distance will have to be played with...

note:do not look into globe you will burn eyes

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

ABOUT The Ultraviolet Spectrum

Ultraviolet refers to all electromagnetic radiation with wavelengths in the range of 10 to 400 nanometers, or frequencies from 7.5E14 to 3E16 Hz.

The UVA range is wavelengths from 315 to 400 nanometers. Wavelengths from about 345 to 400 nM are used for "Blacklight" effects (causing many fluorescent objects to glow) and are usually very slightly visible if isolated from more visible wavelengths. Shorter UVA wavelengths from 315 to 345 nM are used for suntanning.

UVB refers to wavelengths from 280 to 315 nanometers. These wavelengths are more hazardous than UVA wavelengths, and are largely responsible for sunburn. The ozone layer partially blocks these wavelengths.

ref: http://members.misty...don/uvbulb.html

-------------------------------------------------------------------

UV radiation

Electromagnetic radiation or "light" is the collective name for all forms of energy that move with the speed of light. There are different "types of light" in the spectrum, depending on their energy, which is related to the wavelength (freqency) of the light: the lower the wavelength, the higher the energy.

The human eye is sensitive for only a part of the spectrum, referred to as "visible light": between 400 and 780 nm (1 nm = 10-9 meter). The wavelength of the light determines the colour: 400 nm is blue, 700 nm is red.

The part of the spectrum immediately to the left of blue, between 200 and 400 nm is the ultraviolet light (UV). The UV is usually divided into three components, with increasing energy:

• UV-A: 320-400 nm
  
• UV-B: 280-320 nm
  
• UV-C: 200-280 nm
  

Of these UV-B is the most dangerous form, since part of it reaches ground level, where it can affect human health (e.g. cause certain forms of skin cancer) and damage the DNA of flora and fauna. Note that the wavelength of the division between the UV-A and UV-B bands is sometimes set at 315 nm (see note below).

The UV-C energy is potentially more dangerous, but it decreases dramatically as ozone increases, because of the strong absorption in the 200-280 nm wavelength band. The UV-B is also strongly absorbed, but a small fraction reaches the surface. The UV-A is only weakly absorbed by ozone, with some scattering of radiation near the surface.

file:///C:/Users/tim/AppData/Local/Temp/msohtmlclip1/01/clip_image006.gifCLICK TO ENLARGE!!!!!!!!!!

The curve shows a typical vertical profile of ozone in the midlatitudes of the northern hemisphere: the concentration of ozone as function of altitude. Superimposed on the figure are plots of UV radiation as a function of altitude for UV-A, UV-B and UV-C. The width of the bar indicates the amount of energy as a function of altitude. UV-C is absorbed completely in the stratosphere. Of the global UV radiation at the ground, 94% is UV-A, 6% is UV-B.

figure adapted from Stratospheric Ozone, An Electronic Textbook

Atmospheric ozone thus shields life at the surface from most of the harmful components of the solar UV radiation. Chemical processes in the atmosphere can effect the level of protection provided by the ozone in the upper atmosphere.

Ozone decline in the stratosphere can be caused by:

• Chemical processes resulting from the breakdown of CFCs and other ozone depleting gases.
  
• Changes in the stratospheric meteorology, e.g. due to changes in the climate and in trace gases such as nitrous oxide (N2O), water (H2O) and methane (CH4).
  

Thinning of the atmospheric ozone in the stratosphere leads to elevated levels of UV-B at ground level and increases the risks of DNA damage in living organisms. A 1% decrease in ozone, for example, will lead to an estimated increase of UV-B of about 2%.

It is therefore important to monitor the UV radiation that reaches the ground. One of the tools for this is the UV index.

Note on the UV-A & UV-B wavelength ranges

The wavelength of the devision between UV-A and UV-B varies in the literature and this may lead to some confusion.

The Commission Internationale de l'Éclairage (International Commission on Illumination) uses 280-315 nm as UV-B and 315-400 nm as UV-A.

Other sources put the devision point at 320 nm, as in the above given definition. In particular this is done in medical (dermatological) applications, as well as in cosmetics. Also several text books on UV use 320 as devision point.

To avoid confusion, one could use the following short-hand notation: dUVB for 290-320 nm and dUVA for 320-400 nm, where "d" stands for dermatological, and use UVA and UVB for the 315-nm devision quantities. The use of the prefix "d" is not very common, though.

Within the TEMIS project, the data supplied are the UV index and UV dose, which cover (parts of) both UV-A and UV-B. The precise wavelength range that is relevant for these quantities depends on the action spectrum applied:

• UV range relevant for erythema: 280 - 400 nm
  
• UV range relevant for general DNA damage: 256 - 370 nm
  

UV index

The erythemal UV index -- usually simply called the UV index (UVI) -- is an estimation of the UV levels that are important for the effects on the human skin, where 1 unit equals 25 mW/m2. It is usually given for local solar noon, when the Sun is highest in the sky, and it is valid for clear-sky conditions: effects of clouds shielding part of the UV radiation are not taken into account.

The erythemal UV index is an artificial quantity derived from the erythemal irradiance, which is an integration of the UV irradiance at the ground weighted by the CIE spectral action function. The CIE action spectrum is a model for the susceptibility of the caucasian skin to sunburn (erythema). It is proposed by McKinlay & Diffey (1987) and adopted as a standard by the Commission Internationale de l'Éclairage (International Commission on Illumination).

Of the global UV radiation at the ground, 94% is UV-A, 6% is UV-B.

Of the erythemal UV irradiance, however, 17% is UV-A, 83% is UV-B.

file:///C:/Users/tim/AppData/Local/Temp/msohtmlclip1/01/clip_image007.gifCLICK TO ENLARGE!!!!!!!!!!

The CIE action spectrum is a model for the susceptibility of the caucasian skin to sunburn (reddening of the skin; erythema). It was proposed by McKinlay & Diffey (1987) and adopted as a standard by the Commission Internationale de l'Éclairage (International Commission on Illumination).

===> Some more info on action spectra

file:///C:/Users/tim/AppData/Local/Temp/msohtmlclip1/01/clip_image008.gifCLICK TO ENLARGE!!!!!!!!!!

Ultraviolet spectrum measured with the Brewer Spectrophotometer at De Bilt (Netherlands) on 1 June 2002, a completely cloud-free day. Also drawn is the CIE erythemal action spectrum. The multiplication of these two gives the erythemal UV spectrum, and the surface below this graph (shown in yellow) is the UV index. The value of the UVI from this measurement is 6.3.

figure by Marc Allaart, KNMI, De Bilt

Ground-based measurements such as the one from the previous graph give UVI values for these specific sites at these specific moments in time only. In order to obtain the UVI for all locations, it must be computed from total ozone amounts, in combination with the solar zenith angle (SZA): the angle from which the Sun shines. The UV index is usually given at noon of the local solar time: the moment when the Sun is highest in the sky (i.e. in the zenith); this moment is therefore not noon of the local time zone.

Ground-based measurements of the UVI and simultatiously measured total ozone column (TOC) values have resulted in a parametrisation of the UVI as function of TOC and SZA, both at local solar noon. The TOC at local solar noon is determined from satellite observations in combination with data assimilation, which uses meteorological fields (wind, temperature, pressure) to obtain a global ozone field at local solar noon. The SZA at local solar noon depends on the latitude and the day of the year. The UV index thus is a measure for the amount of UV radiation valid for clear-sky conditions and at local solar noon. This does not say much about the erythemal UV dose: the total amount of UV that actually can reach the human skin during a day.

ref: http://www.temis.nl/...info/index.html

So essentually its; UVB`s (280-300nm) is the spectrum that we are looking for........UVB in natural sunlight is 290-295nm.

UVB`s on REPTILES HAve BEEN TESTED!

REPTILE TEST FOR UVB -

We tested samples of fluorescent lamps from each brand which has been alleged to have caused photo-kerato-conjunctivitis in reptiles, and compared the test results with those from other brands.

Broadband UVB meters did not prove very helpful in determining the cause of the problem; they indicated that at the distances at which problems occurred, the total UVB (in microwatts per square centimetre) from these lamps was no higher than that found in natural sunlight. However, total UVB measurements give little indication of the photobiological activity of the lamp.

Measurements of the UV Index (which does provide a measure of this) revealed that whereas 100 µW/cm² total UVB from sunlight was recorded as yielding a UV Index of 1.6 – 2.0, these lamps were producing emissions in which 100µW/cm² total UVB yielded a UV Index of between 8.9 and 14.2. Light from these lamps would therefore appear to be between four and eight times as photobiologically active as light from the sun. At close range these lamps were all producing hazardous levels of UVB.

Spectrograms indicated that all these lamps utilise a distinctive phosphor of a type used in lamps for testing the deterioration under UVB of resistant materials such as roofing and car bodywork, and in older-style human clinical phototherapy lamps (so-called "FS" lamps). The lamps we tested from three different brands generate low wavelength UVB, some from as low as 275 - 280nm, whereas the lower limit of UVB in natural sunlight is 290-295nm. (The phosphor used in many other brands of reptile UVB lamps is of a type used in some human tanning lamps, which mimics the UV in sunlight and produces no UVB at wavelengths below 290nm.)

As well as a much higher proportion of more damaging non-solar UV energy at wavelengths below 295 nm, the lamps with the problem phosphor proved to have a higher total UVB output than most other brands of fluorescent reptile UVB lamps. Because much of this is in the more photobiologically active wavelengths, the risk of reaching a threshold dose for photo-kerato-conjunctivitis, and possibly other forms of UV radiation damage, is much greater than with other lamps.

A combination of other factors apparently increased the risk of photo-kerato-conjunctivitis with these lamps even further:

• In some cases, product literature did not give adequate information. It is essential that lamps are not sold without clear recommendations regarding suitable basking distances and the hazards of over-exposure. Many reptile keepers are unaware that there are any risks associated with close contact with a fluorescent UVB source. The history of fluorescent UVB lamps is such that they are often perceived as "weak" sources of UVB and keepers are often advised to position them close to the reptile.
  
• When placed in aluminium reflectors, in some cases UVB beneath compact lamps was increased by more than 700%. The extreme increase in UVB underneath aluminium reflector domes has not been widely known, or the hazard recognised, either by manufacturers or hobbyists.
  
• Most of the lamps have a low visible light output. They are therefore less likely to induce an aversive reaction, or pupillary constriction, when in the reptiles' line of sight. They do not "look like" very intense, direct tropical sunlight.
  
• Most of the UVA output of these lamps is not in the visible UVA range for reptiles, since the threshold for vision is about 350nm. This reduces even further the visual impact of the lamp to the reptile.
  
• Fluorescent lamps produce a small amount of heat. This is insufficient to deter a reptile from a close approach, and in fact the gentle warmth may even prove an attraction.
  
• Broadband UVB meters such as the Solarmeter 6.2 provide only readings of the total UVB in microwatts per square centimetre. This gives little indication of the photobiological activity of the UVB radiation from this type of lamp. Misleading comparisons of lamp and solar readings taken with these meters may be made, possibly leading to incorrect placement of the lamp, if this is not understood.
  

We believe the use of a “phototherapy†phosphor in these lamps is a cause for concern. The effects of long-term exposure to non-solar wavelengths on reptiles is unknown, but these wavelengths are far more damaging to living cells than solar wavelengths. FS lamps have been used widely in research upon cell damage and immunosuppression, and to induce skin tumours in laboratory animals. FS lamps have been used in at least two studies with reptiles which suffered unexpected detrimental effects apparently related to their UV exposure, including photo-kerato-conjunctivitis, depression and death, and skin tumours. Although the compact lamps we tested from ZooMed, and the T5 and T8 tube we tested from R-Zilla are not FS lamps, they do appear to contain the same phosphor. The Big Apple Herpetological Mystic tube and compact lamp we tested, however, have spectra very similar indeed to FS lamps.

ref: http://www.uvguide.c....or-summary.htm

This is a good read - http://www.greenmans...guides/thc.html

Lots of info and stats - http://www.uvguide.co.uk/

A very useful site - http://www.uvguide.co.uk/fluorescent....htm#uvboutput

Another useful read - http://www.aquarium-...uvlighting.html

The nex two links are from forums and are very interesting -

http://www.rollitup....ake-more-7.html

http://www.rollitup....-uvb-light.html

Wikipedia covers all the general stuff - http://en.wikipedia....iki/Ultraviolet

Nothing to do with THC but may be useful cleaning hydro system of pathenogen and algy - http://www.allpondso...terilizers.html

These two links are for manufactuers of UV lights

http://www.exo-terra.com/

http://www.zoomed.com/

I have decided for my next grow to use anLED light combined with two Repti Glo 10.0 @ 14W each.

I am in the process of saving pennies at the moment, so it will be a while before I start that.

Hopefully some of you will get there before me, I will be very interested to see the results

That all fo now hunters may your THC be bountiful

Peace

Lams

[Dust]

did anyone ever do a comparativ grow with and without uv? would be cool to see that ^^

Nice reading lams

[lamsbread]

UV THC boosting is still very much in it's infancy, documentation is very sporadic as are true grow tests and comparisons.

It is something we will see more of in the future. Presently the UV tubes and UV cfls are specifically designed for reptiles and aquariums.

When people start documenting the result of thier grow and show thier results, more people will start to use them. Once these light are being used more online in forums this will produce an increasing demand for the tubes/cfl's,after that, i imagine that we will see uv lights specifically targeted at cannabis growers.

I agree with you Dust a comparison grow would be great, even better if it could be done here in our forum, a bit of kudos never goes amiss.

There also exist UV LED's, though they are not made in sufficient quantities yet to make them afordable yet.However it is my opinion that as the popularity of LED lights increases and the tecnology keeps improving year on year, i imagine we will see UV LED incorporated in to standard LED grow lights.

I will leave you with a link to the "Solarstorm" from the "California Lightworks", it is an LED grow light with a UV tube either side.Here the link to the article in which i copied and pasted this picture from - http://ledgrowlights...rge-mekhtarian/

The light shown in the above article does not ship with the tubes and are something you can add yourself, this keeps inital purchase price lower and allows for the user to decide which particular UV tube they wish to fit.

Also a link to the California Lightworks - http://californialightworks.com/

In the near future i will be purchasing a LED light from "Hydrogrowled" which will be from the the "Penetrator X pro" range and adding two 14W UV tubes, one either side, just like the "solarstorm" has. The funniest thing is this is what i had decided to do before i found the "solar storm" review.

Peace hunters

Lams

[Dust]

nice led with T5 thing but must be expensive ^^

So seeing this made me think of something, i just remembered i had a black light sleeping somewhere ^^

In what categorie will you put them, they are suppose to have very low uv production but still a very little, would it be usefull in a grow? perhaps in the last week to modify spectrum a little?

[lamsbread]

Yes that particular lights specs for the

Total Power Consumption are:

• Veg Mode 450 Watts

• Bloom Mode 620 Watts

• Bloom Mode + UVB 650 Watts

• Power Factor 0.99

• Max Current at input 5.5 Amps

It uses super bright 5W LED chips

Price is a $1999 so once again we all groan and repeat the mantra "I'll get one when the price comes down"

As for you black light only useful if you having a party, unfortunately that particular UV light produces UV-A light which is not useable for THC production.

The usable UV light that you would use is UV-B for THC production.

Peace Lams

[bozoph]

if humans and reptiles need uv so do plants.my lizard has a uv cfl to supplament his heat light. bearded dragons with uv light will develope better brighter colors and be far more healthy

[Flail]

You guys are awesome! so much knowledge, it wouldn't be long until this is tested i'm sure of it.

[mopman]

Love to know if this works

[alexbiologo]

At the end will it be like this?

More stress more resin less buds

Less stress less resin more buds

So at the end do we have: the same amount of resin in more or less buds?

Its all makes me dizzy LOL

Great post Lams!!!!!!!

[MasterChem1]

I was doing some research on this today, from what im reading it doesn't seem like a stress thing.. Apparently our plant creates thc to defend it against insects and uvb light is needed to convert cbd to thc.

Our body uses UVB light for health to create vitamin D and stop scurvy, Yaaarrrr!

Marijuana man has a nice little watch.

Forget the the uvc and germicidal lamps, they are dangerous and will destroy your thc

If anyone is interested Ive found some lamps to start.

Reptile desert cfl bulb, they create some uvb and are not too expensive

&

Philips also do a uvb florescent light for medical purposes called Philips UVB broadband (/12) photo-therapy lamps. They are 100% UVB but are properly hard to find.

It would be lovely to taste the difference.

[Dust]

thanks for sharing your info with us man