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UV necessary ? Vote

  • Thread starter Thread starter MarsHydroLED
  • Start date Start date Dec 3, 2019
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UV necessary ? Vote

MarsHydroLED Dec 3, 2019 71 Replies 10,861 Views
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Do you think it is necessary to add UV chips to the LED grow light?

  • Yes, it will help on growing

    Votes: 15 48.4%
  • No, not much help

    Votes: 9 29.0%
  • Others, please kindly comment your ideas

    Votes: 8 25.8%

  • Total voters
    31

Aqua Man

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#21
1diesel1 said:
Plants use sunlight for photosynthesis and are exposed to ultraviolet (UV) radiation that is present in sunlight. UV radiation is divided into 3 classes: UV-A, UV-B, and UV-C. The Ultraviolet-C (UV-C) region of the UV spectrum includes wavelengths below 280 nm; these highly energetic wavelengths are absorbed by ozone and are not present in the sunlight at the earth's surface. Under normal growing conditions, effects of UV-C light are not seen on plants. This research examined the effects of the application of ultraviolet-C irradiation (UV-C) on greenhouse ornamental plants and demonstrated very promising uses of UV-C as a treatment to increase branching and reduce the height of plants, and in some situations, affect the rate of flowering. Several conclusions have been made from this research that are consistent with multiple plant species. First, the amount of UV-C light that a greenhouse plant receives is critical to its response. The proper weekly dosage, for as little at 15 min a week, will control a plant's growth response. In addition, too high a dosage of UV-C irradiation will burn plants and too low will have no effect. Second, proper applications of UV-C light decreases final plant height. Several plant species have responded to applications of UV-C light by growing shorter than the control plants that receive normal greenhouse lighting. Third, UV-C light increases branching of greenhouse plants. At appropriate dosage rates, UV-C light increases branching on some species and increases the number of flowers that are produced. This avoids the need to pinch plants and to apply plant growth regulators. Fourth, the application of UV-C light can affect flowering time. The application of UV-C irradiation can either delay flowering or cause earlier flowering depending on plant species and dosage rate. In some cases, the increased branching is accompanied by delayed flowering.
Click to expand...
Yeah but intensity is going to be absolutely key.
 
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Aqua Man

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#22
ozarkgrey said:
i would assume the amount is safe for our purposes, and doesn't constitute a significant cost to either the manufacturer which is in turn passed onto the buyer . will the UV lights be controlled by a switch for the flower cycle?
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No it's not safe... You can easily cause damage you your eyes and skin depending on UV source and exposure time
 
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Aqua Man

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#23
Just a useless note UV damages cell DNA and can cause cancer and mutations also.
 
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CannasaurusR

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#24
20-30 % increase in thc with the only change being addition of UV light? Complete and utter B.S.
 
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Aqua Man

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#25
CannasaurusR said:
20-30 % increase in thc with the only change being addition of UV light? Complete and utter B.S.
Click to expand...

I'm thin on debate tonight but how is it bs?

You do realize this is an increase OF 20% not BY 20%?
 
Last edited: Dec 3, 2019
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ozarkgrey

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#26
Aqua Man said:
No it's not safe... You can easily cause damage you your eyes and skin depending on UV source and exposure time
Click to expand...

i didn't assume it would be a tanning bed. i was asking more as in how would it be made safe for plants? i had guessed the amount we would receive would lull in comparison a sunny day outside. i already have skin cancer by the way so, let's talk about yield and thc content.
 
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Aqua Man

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#27
ozarkgrey said:
i didn't assume it would be a tanning bed. i was asking more as in how would it be made safe for plants? i had guessed the amount we would receive would lull in comparison a sunny day outside. i already have skin cancer by the way so, let's talk about yield and thc content.
Click to expand...
Sorry to hear that bro. I'm really not up on all the info. But there are tests done with various intensities for various durations this is where I don't feel we know exactly what ratio of UVA to UVB and intensity/duration is optimal. At least I don't. Something like 90-120w per M2 for 90 min a day. I would have to dig back into so don't take that as fact... Then there is what time of day is best or intervals. If you google it I'm sure you will find a a fair bit on it.
 
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Aqua Man

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#28
If you read that link I gave it will include reference literature for UVA and UVB on the increased THCA production provide. I have no personal experience with it. I feel there is merit to it but not enough info as a whole yet. I should say not enough independent info on it yet
 
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CannasaurusR

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#29
!8% thc plant 20% increase is an additional 3.6% giving a total of 21.6 % thc from the addition of a non-specified amount of additional uva b c (doesn't really matter the uv increase #'s . If that is acceptable to by and of. Then yes, It is an opinion and my opinion is, it is utter bullshit. I am not debating I am rejecting the original info, not meaning to insult, just reiterate a completely different opinion.
 
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Aqua Man

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#30
CannasaurusR said:
!8% thc plant 20% increase is an additional 3.6% giving a total of 21.6 % thc from the addition of a non-specified amount of additional uva b c (doesn't really matter the uv increase #'s . If that is acceptable to by and of. Then yes, It is an opinion and my opinion is, it is utter bullshit. I am not debating I am rejecting the original info, not meaning to insult, just reiterate a completely different opinion.
Click to expand...
I gave my numbers on best case 30% if you care to recheck my math. Again you are misinterpreting my info and my math now.

It's pretty clear here that your statement was assuming an increase BY 20-30%. As you stated.

CannasaurusR said:
20-30 % increase in thc with the only change being addition of UV light? Complete and utter B.S.
Click to expand...

I'm not sure what you are objecting to. I believe the study by university of Maryland in the 80's showed 28% with only UVB although there was some question about the possibility of UVA being leaked also. If you have a strain that is averaging 27% and a 28% increase that's a jump to 34.56% that's kinda huge imo. There has been a lot of discussion over the years about how CMH grows seemed to yield frostier and better quality bud than the same strain under other lights. This could be attributed to the amount of UV given off by CMH over HPS.

I'm not saying the numbers are all 100% accurate but there is some evidence so I wouldn't call it complete and utter bullshit. But yeah there is not enough info imo.

And there are specified times and intensity I just don't remember them
 
Last edited: Dec 4, 2019
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CannasaurusR

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#31
Well if it only increases costs by the corresponding % then I'm in. U of Maryland from the 80's aww you win I'm not googling that...
 
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Aqua Man

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#32
CannasaurusR said:
Well if it only increases costs by the corresponding % then I'm in. U of Maryland from the 80's aww you win I'm not googling that...
Click to expand...
I'm not advocating it but I cannot discount it and I feel there is merit to it. The number are debatable... I don't feel there is enough independent studies done.
 
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MIMedGrower

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#33
Aqua Man said:
UVA alone does not provide the same results. The best results have been a combination but from what I have researched UVB is the most important. That's not to say UVA is not beneficial
Click to expand...


There are no uvb led diodes. So they are adding what they can and marketing from limited tests. It is supposed to add flavor. But we know sulfer is most responsible for smell and flavor. UVB is what increases thc for sure and no uva is needed for that. Of course like you said a balanced spectrum would be most beneficial.
 
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MIMedGrower

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#34
CannasaurusR said:
!8% thc plant 20% increase is an additional 3.6% giving a total of 21.6 % thc from the addition of a non-specified amount of additional uva b c (doesn't really matter the uv increase #'s . If that is acceptable to by and of. Then yes, It is an opinion and my opinion is, it is utter bullshit. I am not debating I am rejecting the original info, not meaning to insult, just reiterate a completely different opinion.
Click to expand...


There have been many tests showing that adding uvb (i dont remember the percentage of total light but solis tech makes a 10k mh bulb specifically for this purpose) for the last 2-3 weeks of ripening showing an increase of up to 4%. Ie: 18% without/ 22% with. The 20% quote is for marketing and is the total weight of thc increase. Just tricky math.

Even read this in Ed Rosenthals growers handbook from the 90’s.
 
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Dbear180

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#35
I've read some of the led guys on here swear by their new supplement lighting uv strips. Only run them for like 5 minutes or something like that per day. I personally have no exp with them tho.
 
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ozarkgrey

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#36
Aqua Man said:
Sorry to hear that bro. I'm really not up on all the info. But there are tests done with various intensities for various durations this is where I don't feel we know exactly what ratio of UVA to UVB and intensity/duration is optimal. At least I don't. Something like 90-120w per M2 for 90 min a day. I would have to dig back into so don't take that as fact... Then there is what time of day is best or intervals. If you google it I'm sure you will find a a fair bit on it.
Click to expand...

oh no troubles it's' the good kind', super slow and they burn em off. i spent some time in hot sunny places as a young man.
 
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basscaptain

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#37
Dbear180 said:
I've read some of the led guys on here swear by their new supplement lighting uv strips. Only run them for like 5 minutes or something like that per day. I personally have no exp with them tho.
Click to expand...
I"m running mine the whole light cycle
so I guess I should spend hrs reading up on this...... Oh I can't read really... so that's not going to happen..................


so by hands on and 1st time with indoor growing but my plants like it.....................................
Even mine cheap blulight has uv in it................... Part of the reason I Think it works so good.......................................
I have a QB with it also and there made to run when you went it on......
I do run that for about a hr a day...... But my extra red runs the whole light cycle
 
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ozarkgrey

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#38
i have troubles with reading too
 
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basscaptain

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#39
ozarkgrey said:
i have troubles with reading too
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lol for me it's called no schooling and working full time since I was 12.................................
I'm good to get by but reading and spelling is not best skill set........
$$$$$$$$$$$$$$$$$ and Adding We have NO Problems with LOL :) good morning all>>>>>>>
 
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basscaptain

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#40
I got to vent here for a min......... cause........................ and this not to anyone.................................

but why would you only run a extra red strip for only a few hrs...?
THE Sun is not on a timer with it's spec....... so in my mind .....................>>>>>>>>>> it should run the same as the other light............
Guess this maybe wrong by books.....
But there's a lot of WRONG Info in Books............................ In my world HANDS on is Best......
 
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Thread info

Replies 71
Views 10,861
Started Dec 3, 2019
Latest post Dec 19, 2020
Starter MarsHydroLED
Forum L.E.D Grow Lights

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