Black Light During Flower With Hps

im with you, i think the black light WITH the hps helps to produce more sticky buds, ive heard a few ppl say this actually. but using Black lights only will not work, thats a given

 

Seems like an interesting Idea - I'd like to learn more about it.

 

yes the use of black light for added UV-B along with HPS will produce stickier more potent buds. The plant releases more resin as protection from the UVB rays.

This is why outdoor grows in the sun are ALWAYs more potent than indoor grows.

 

HAHHAH... .....
..

 

dont pay them any mind, its a useless battle, most never even had a successful outdoor grow to compare to indoor. As many has said there is no substitute for the sun, sorry but its a fact.

 

I hope you aren't referring to me here because of me reply..

So your saying a huge mexican guerilla grow, pollinated and shitty as all hell but still grown outdoors under the sun is better than some of the most potent bud from canada grown under the most expensive equipment you can get by some of the most expirenced and professional growers, indoors? I beg to differ

 

No im not refering to you and definately not to HUGE mexican grows that have little to no care what so ever while growing.

Im talking about a outdoor grow done with love and attention compared to an indoor grow done with love and attention.

 

yeah that is verry true the only reson they do it indoor is because they can pick when to bud them, compaired to once a year with the sun.


edit: haha what a lame post

 

One a year for you folks up north, im in the caribbean and there is sun 365 days a year at 80+F

 

Luckyyyyyy

 

I use uvb producing bulbs on a daily basis for my day job, and actually have a handy meter for testing uvb output of bulbs.http://www.solarmeter.com/model6.html. Truth is Black lights put out VERY Little if any uvb rays depending on brand, and those rays reach aboyt 3-6 inches form the bulb at the most. Blasck lights produce mostly uva rays, not uv-b. If you want uvb buy a bulb specifically for desert reptiles. Reptiles need uvb provided in captivity to make vitamin d3 which aids in the synthesis of calcium in the diet. These bulbs are made to provide uvb. I suggest either reptisun 10.0 or Mega Ray external ballasted mercury vapor bulbs.. Rerptisun 10.0 put out on average 40-50 microwatts2 at about 12-18 inches form the bulbs surface... The mega rays provide much more around 150-225 microwatts and these throw the uvb much further at about 1-3 ft from the bulb.. For refrence on a sunny day on the east coast usa uvb reads at about 300-375 microwatts2. although these bulbs are not nearly as strong as the sun, they do provide uvb which is greatly missing in indoor grow lighting, and 40-200 mw2 is better then nothing at all.. Plants make those trichomes to protect the seed pods from uvb rays.. so in essence providing any uvb at all will increase potency to some degree

www.reptileuv.com for the mega rays.. your going to want the external ballasted bulb kit as those give off very little heat..

and for the reptisun any pet store will have them www.bigappleherp.com.. you want reptisun 10.0 though there are companies that claim uvb output on theor bulbs when infact they are crap.. the two I mention here are the best for providing uvb in captivity.

After saying all that I have noticed increase in trichome production since using them in my closet.. If you take a look at my grow journal pics the bulbs standing up in the back are 2 40 watt reptisun 10.0's.. I also have 2 20 watters that run along each side of my econo hps hood.

Ice at 38 days and a while to go





taken from another site

have to disagree with you about lights. I've been growing under metal halides (MH) lamps for more than 20 years. In CC issue #34 you stated that MH lamps are useful only when the amber light of a high-pressure sodium (HPS) lamp would cause a problem.

My associates and I would disagree. The consensus among us is that HPS lamps produce more weight, but the stoniest, longest-lasting high comes from metal halide lamps.

Ultra-violet (UV) light is the key. MH lamps produce more than HPS lamps and the more UV, the higher the potency climbs in normally high potency plants. I grow for buzz, not weight, or you could say for love, not money, so the MH lamps suit my purpose. I use a Sunmaster MH lamp. The plants produce a little more weight under them than the old 5500K (Color temperature) bulbs, but they've kept the UV light strong.

Anonymous Bud,
Clifton, Colorado


In CC#34, in the article Pot Potency it stated that UV rays and high light intensity caused cannabis plants to produce a greater amount of cannabinoids. Is this true? If so, would MH lamps be better to grow stronger pot than HPS lamps?

Skydog, Ontario


The article that you refer to, Pot Potency by DMT, discusses the environmental aspects of THC production. In the same issue, I recommended HPS rather than MH lamps.

One of the factors that DMT covered was ultraviolet light. There are three spectrums of UV light. UVA is the least harmful. This is the spectrum produced by black lights. UVC light is dangerous to all life. It is used in water purification systems to sterilize water.

The light spectrum of interest to us is UVB. It affects life in many ways. In humans it causes tanning, skin aging, eye damage and cancers. Other animals are affected by it in all sorts of ways.

The Earth's atmosphere filters UVB light. There is more UVB light at high altitudes than at sea level. Also, sunlight at the equator takes the shortest route through the atmosphere. As the latitude increases, sunlight reaches Earth after going through more atmosphere because of its slanted path. Therefore UVB at the equator is much more intense than in temperate zones. That's one reason people tan or burn so fast in the tropics, and why skin cancer rates are higher in southern than northern states.

A researcher conducted a controlled experiment in a greenhouse. He lit a group of high potency plants similarly except with the addition of UVB light to some groups. He found that the percentage of THC increased in a direct ratio with the increase in UVB light. This research confirms the adage that high altitude plants are more potent than those grown at low altitudes.

If you look at old-world land races of cannabis, plants that have become adapted to the climate and latitude, the ratio of THC to CBD starts at 100 : 1 at the equator. At the 30th parallel (The Hindu-Kush Valley) the plants have a ratio of 50 : 50. At the 45th parallel the ratio is near 1 : 100. This corresponds roughly with the amount of UVB light received at these latitudes. There is much more UVB at the equator than the 45th parallel.

How can you get more UVB light to your plants? Certainly it's true that MH lamps emit more UVB light than HPS lamps. Still the amount that MH lamps emit is small. In fact, many manufacturers use UVB shielding glass to filter out most of the UVB that's produced. The UVB light the plant receives from an MH lamp does increase the plant's potency slightly at the cost of yield, but there are better ways to introduce UVB light into the grow room. They include reptile lights, which emit about 10% UVB, and tanning lamps.

The problem with using these lamps is that they are associated with increased number of cancers and many other problems. They should not be on when you are in the grow room. Not much research has been conducted on using them to produce higher THC values. I will do a full report in a future issue.

 

Hey, sorry i can't 'back up my theory' but i read in a book (cultivators handbook by bill drake) that black lights do not work, for some reason or the other, although it was made in 1979 and things may have changed? I don't know. I also have a couple of black lights sitting around, so i'm interested in finding out the true answer.

 

Well, maybe they meant black lights alone don't work, but anything outputting UV-B should do the trick...BTW, anyone know if UV cold cathodes for computers output UV-B...cause i'm thinking of getting 2 of em' for 9 bucks off NCIX.com

 

sorry not sure what your speaking of about uv cold cathodes. I do have a uvb meter, and could check it for you, but I don't know what they are LOL.. I know the easiest, and cheapest way to provide a good level of uvb would be with the Reptisun 10.0's. They make them both in cfl, and long fluorescent styles.. I use the long bulbs for my plants, and know without a doubt these are providing uvb the uv that effects the plants trichome thc levels.

This will be my first run with this much uvb in the grow space (other then outdoors of course), so I'll give a run down on potency in my grow journal when done. No other way for the lyman to check potency other then smoke it up... I wonder what type of equipment/machine they use to check thc levels in the lab.. anyone know what is used off hand??

http://www.reptiledirect.com/index.asp?PageAction=VIEWPROD&ProdID=944

http://www.reptiledirect.com/index.asp?PageAction=VIEWPROD&ProdID=898

 

The UV wars continue!

Heres my contribution. I also read that researchers UV work. In his experiments he had a very gradual and complicated UV regimen. WHat i mean is he started using the UV light for about 15minutes a day, slowly he increased this to 2hrs. I think he then gradual decreased the light back to 15 minutes(i think he reduced to 15 after 2hrs, not 100% sure though)

So my contribution is, dont run your UV lights for more than 2 hours a day. I think past this you run into diminishing results. This part was just a recommendation from another grower, but the researcher also hadnt been using them for more time than that.

I had a bookmark for the page that held some forum posts that the actual researcher himself posted, but the link is dead(wierd i just found the site a cple days ago, now its gone. UK420 is down/gone too. Is big brother shuttin sites down, or what?).

UV works(get the real UV bulbs he mentioned) just not 24/7. I wish i had more to back up that statement, but its outta my hands.

 

Here is a link..

http://biol.lancs.ac.uk/psi/research/uv_radiation.html

No war on my part, i have known of this for years, simply by trying to replicate the sun... and this is good for those who use flourescents as UVB increases PAR value in low light conditions.

I use mine all the time, but its only a 2 ft blacklight for a 15'x15' room, nested between my 4x1000w MH/HPS
is will give about the right amount without overdoing it.

 

No war, bad analogy, more like forceful enlightenment

Anyway im gonna check your link and heres the one that i mentioned: http://cannabase.com/cl/bcga/bcga/uv.htm It wasnt working before but i think its working now. Its an archive of the research guy talking on a forum somewhere in 1998. So check them both out.