Hello I heard on here somewhere that you can run your UVB light 24/7 during the dark period and it wouldnt cause stress.

Has anyone tried this out yet? I am curious because that would be alot of trichome production

Are UVB lights harmful in anyway to humans?

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nah shouldnt be very harmful, they are just reproducing the suns effects. I know there were some old ones that they used to make that put out alot of UVA, but they quit making those. And yes UVA is harmful to humans.

Bullshit. UVB is harmful to humans and can cause problems ranging from slight sunburn to full-on skin cancer. Don't spend a lot of time exposed to it.

As fo leaving the light on the plants 24/7, it sounds like a dumb idea to me. UVB causes stress in plants, which is a good thing in small doses (from our point of view, anyway), but too much stress will quickly lead to hermies and/or dead plants.

UVB is not known to cause any more serious stress to plants than the sun would. BUT TO STAY ON TOPIC

I have also heard that you can train your plants into running the UVB 24/7 regardless of cycle. I would start running it 6 hours during light, and then add an hour every day. So after 14 days it has slowly been introduced to keeping a UVB bulb on 24/7... Now I haven't personally tried this- but it seems it would be a fairly reliable method in introducing UVB to your plants 24/7

Also, I would recommend a remote control lightswitch so you can turn the UVB bulbs off prior to entering the grow room, which will prevent any of the UVB light from ever touching you, making it 100% human-safe to use.

Hope that helps.

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Anyone got any links to grows where UVB has been used 24/7? I'm still not convinced personally, although I am far from an expert.

I have seen stress caused simply by leaving a 10.0 UVB bulb on 12/12, so 24/0 seems like total overkill to me, as well as being very unnatural. Maybe a 2.0 or 5.0 would be better for this, but it still doesn't seem right to me to have it on in the dark period.

I can't say 24/7 but a study conducted in 1986 used UVB for only a few hours, and it showed that the increase of THC in trichomes was in linear proportion to the additional exposure of UVB.

UVB can cause blindness. When I get ready to run UVB, I'm gong to enter my room with UV-blocking sunglasses and probably sunscreen. I'm not going to bother turning it off.

Why is everyone doing the same thing with UVB as every thing else acting like we each know it all...
The generic "stress, but too mcuh stress...." response
"I haven't tried this, but"...
Just say I don't know or look it up no more trite bullshit.

If you grow outdoors, your plant flowers due to the diminshing of the directness and amount of light reaching your plant. UVB exposure reaches apex in veg and tapers off throughout flowering (just like the rest of the sun)...

at harvest time on my latitude I receive less than an hour (30th parallel[semi-tropical]) over 150 microwatts uvb per day, that is nothing. You should calculate 250uW from your light, find the distance from the bulb that that is and imitate sunlight for best results
In my experience, you can do a little more than the sun but you will start seeing spotting in your leaves and shit.

If someone has better luck doing multiple exposures per photoperiod, I am ALL EARS!!! I'd love to run some experiments with this bulb but as for now I am sticking with sun imitation, it has worked with the most success (Ive tried multiple exposures/photoperiod and I always have problems)


nycd day 37

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The reason that the "stress but not too much" is considered a generic response is because it holds true in 99% of cases, and your post simply backs that up.

Also, just because Growtech (or myself) haven't tried this, are you saying that our viewpoints are invalid? If so, I should point out that you haven't tried 24/0 UVB either.

I have never stuck my hand into a flame either, but reading accounts of others who have is enough to convince me that it hurts like hell.

Like I said, never tried this- but I can't say if it will or will not work. Only recommending that you slowly adjust the amount of exposure to your plants hopefully preventing any shock they might deal with.

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