Will a black light work

[wookie]

blacklights only produce violet light... plants need red and blue..
and by the way plants dont need green light, the reason plants are green is because they reflect the green light and absorb the red and blue

[JusSumguy]

Current studies suggest that pot creates trichomes as a means of defense against UV light. While you could never use it for growing, another approach to this would be to apply it to your plants in addition to the grow lights.

The results are amazing. After the plants are around a month old you can begin. Blast em with the UV for five minutes, twice a day. After a week make it three times. You want to gradually increase this until you reach thirty min three times a day. All the way through flowering. Any more time each day and you risk burning the plants. This will cause trichomes to develop ALL THE WAY ACCROSS EVERY LEAF. Can you say BUBBLE?

So....... Yes, you can use that UV light.

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[DankNess]

RIGHT ON THE BUTTON!!!! hey JUSUMGUY would you mind posting that under indoor a thread started by me about black lights? and a source would really be good too. thanks man!

BUT for this thread i stand with you! black lights can be used in a very beneficial way to gain thc! but not alone.. they dont put out shit for lumens and they dont have the required spectrum/s as you mentoined more red for flower and blue for veg. you must use in conjunction with hps.. im so high

[stonerremines]

Originally Posted by Grassmann1

a buddy of mine gave me a few black lights, and i was wondering if they would work if i tried to grow some pot??

Well if you plan on growing with a black light, dont try it. Use the lights the act as the sun. But you also have to think, when your plant is growing outside the moon has a impact on its growing and health, so i might recomend you use a black light on nights that there is a full moon outside and well you never no the result could be some better buds.

[randomled]

Sorry to push this thread more, but:

Considering black lights do emit some violet-blue and violet light that falls under the absorbance curve of chloraphyll, you can't say this light does nothing. Considering most of the light is UV though and there is a blue coating on the outside, I'd still call this a lousy light.

One interesting flouro tube i've been wanting to try though is coralife actinic 100% blue. It uses 100% blue phosphers that emit at around 430nm. Ofcourse they're not bright because humans can hardly see 430nm, but plants LOVE 430nm. (and 660nm)

If only they had 100% red 660nm tubes as well. They would make the ultimate combination of flouro tubes. maybe when people finally start understanding that:

LUMANS ARE FOR HUMANS. You can make your plants as bright as you want if you want i guess but plants don't really like yellow or green. Yellow and green just happen to look really bright to humans, but in reality this is just where your cones like to absorb light the best. Plants "cones" absorb light best at 430nm and 660n and we can hardly see those colors because they're far from our cones peak absorbance. Plants cones however are AT 430 and 660nm and what seems really dim to you is very bright to them.

flumens and blumens vs lumens!!

[ejr8568]

well considering im still fairly new at growing and this thread just keeps getting more confusing, ill stick to the tried and true methods until i see some pics

[TheColonel]

Few of our members have been using uvb w/ great success.

"Pate (1983) indicated that in areas of high ultraviolet radiation exposure, the UVB (280-320 nm) absorption properties of THC may have conferred an evolutionary advantage to Cannabis capable of greater production of this compound from biogenetic precursor CBD. The extent to which this production is also influenced by environmental UVB has also been experimentally determined by Lydon et al. (1987)."

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.

(b)"The maximum UVB irradiance near the equator (solar elevation angle less than 25 deg.) under clear, sunny skies is about 250 µW/cm2. It was observed that the daily solar UVB in Riyadh, Saudi Arabia (N24.4Lat.) decreased from September to December by about 40% (Hannan et al. 1984). The further a person is from the tropics, the less UVB radiation there is: the average annual exposure of a person living in Hawaii is approximately four times that of someone living in northern Europe."

http://greenmanspage.com/guides/thc.html

[sidious]

oh man......."This old chestnut!"..........lol..........Peace out.........Sid

[seeofgreen]

Still going ....hey sid good to see you still poppin' in from time to time

[HENNESSY]

It's in here somewhere but blacklights are actually useful when growing.... helps you check on fungi growth or whatever... reading it kinda makes ya wonder about what your smoking thou so you might wanna keep your eyes virgin like I wish I did lol.


http://nepenthes.lycaeum.org/Plants/.../preserve.html

[THE_MAN_420x]

update, i used a black light for fun on a shit seed, and well it works but it sucks ass.

i used it on there for about a week for fun =)

[russell300]

Good on you for asking a question boss that is what a community is there for. Dont diss the poor soul.
Toke it up.

[Zero Hero]

I think I read in Ask Ed that you can use black lights during your dark cycle to boost THC production.

I've never done it myself though.

[champloo]

Lmao, so many ppl ask that question XD. Think about it, using lights to grow your plant is the art of imitating the sun, is a black light very sun like?

[Noobness]

dude postin this sounds like the police