UVB Timing

Positivity said:

I'll try that out sds. Herb seemed pretty damn good though last run where I ran it till harvest. Sun dosent take a break where I live...seems "unnatural" ?

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Listen..I haven't quite understood what you mean by 'it doesn't take a break ...

I can imagine some "meanings " though ...

Either where you live ,resembles the place where I live ...
From 365 days of year ,almost the 300 of them sky is clear and sun is up high.
This winter ,no snow-no winds-no rains-no cold ..nothing ...Sunshine ...
While in the rest of Europe ...They almost drawn from rain and got burried under snow ...
At Summer uvb goes pretty high (UV index averages 9-11 )..
Winter has lower values ..( UV index averages 5-7 )

Either you live in even more tropical climate than here ,where I live ...
Almost constant 12/12 ,all year round..
With higher rates of UVB (peaks ,"fade in " -"fade out " min values =Dawn/Dusk lowest values ,average,mean ,etc ) ....
( UV index : >=9 )

Either you live in Poles where they have 3-6 months ,daylight almost day long ( midnight sun,eh ? ),but almost no UVB at all ...
( UVI =< 5 ) ....


In every case ,there's nothing 'unatural" .....

In the tropicals ,Sativas have pretty 'narrow' 'harvest window' ..
Trichomes darken faster ,than anywhere else in the planet ..

Positivity said:

I'll try that out sds. Herb seemed pretty damn good though last run where I ran it till harvest. Sun dosent take a break where I live...seems "unnatural" ?

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[h=1]Effects of delta9-tetrahydrocannabinol and cannabinol in man.[/h]

[h=3]Abstract[/h]The interaction of delta9-tetrahydrocannabinol (delta9-THC) and cannabinol (CBN) was studied in man. Five male volunteers were given placebo, 50 mg CBN, 25 mg delta9-THC, 12.5 mg delta9-THC + 25 mg CBN, and 25 mg delta9-THC + 50 mg CBN (orally). Administrations were spaced 1 week apart. With physiological measures, delta9-THC produced an increase in heart rate while CBN did not. When combined, no change of the delta9-THC effect occurred. No changes occurred on the electrocardiogram, blood pressure, or body temperature. With psychophysical measures no changes occurred in pain thresholds or skin sensitivity as a function of drug treatment. In time estimates of the passage of 1 minute, delta9-THC alone produced underestimates of the passage of 1 minute and CBN alone had no effect. In combination the two drugs had a tendency to produce significant overestimates and underestimates of the passage of 1 minute. On a 66-item adjective-pair drug reaction scale, the volunteers reported feeling drugged, drunk, dizzy, and drowsy under the delta9-THC condition, but not under the CBN condition. With combined drug treatment, volunteers reported feeling more drugged, drunk, dizzy, and drowsy than under the delta9-THC condition alone. None of the drug treatments produced significant changes on other items which included items on perception, emotion, cognition and sociability. It appears that CBN increases the effect of delta9-THC on some aspects of physiological and psychological processes, but that these effects are small and cannot account for the greater potency which has been reported when plant material is used.





That's why ...
Still pretty relative ...
I like it too ,this way ...
Till harvest ...
But increased potency is accounted ,when UVB -UVA-Violet-BLUE irradiation is diminished ,few weeks before harvest..
And those are not relative reports ...
They are numbers,from chemical analysis results* ...
Thc is increased with UVB irradiation.Under strict conditions.

*
http://www.alpha-cat.org/

Thank's to all you people for the free advice. I will use it in good faith. I am totally new to this LED scene, but I like it. Now for my milk and cookies(good for what ales me.)

stardustsailor said:

My one cent ,here ...

Uvb should be utilised from start of growth cycle (veg ) in low power ( lamp pretty far from plants ),so the
plants will have the time to 'get used ' to added UVB...
As cycle moves on ,Power of UVB radiation should be increased gradually ,to peak around 4-5-6 week of flowering .
Then it should gradually decreased .Last two-three weeks of flowering (before harvesting ),UVB (or UVA ) ,should be not utilised.
It has be switced off ,in the last 15-20 days ...
Otherwise ...
It will degrade Delta9-tetrahydro-Cannabinolic acid into cannabinolic Acid ,which after decarboxylation ( "curing " ) will be Cannabinol....

https://en.wikipedia.org/wiki/Cannabinol

http://sensiseeds.com/en/blog/cannabinoid-science-101-cannabinol/

View attachment 3029855

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Ok, I'll buy that. But what about those of us that run perpetual crops? We could shut the lights off for the last 2 weeks, but at that time is when the "next" plant in line would be needing the UVB treatment.

So, what do we do with this problem?

ProdigalSun said:

Ok, I'll buy that. But what about those of us that run perpetual crops? We could shut the lights off for the last 2 weeks, but at that time is when the "next" plant in line would be needing the UVB treatment.

So, what do we do with this problem?

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Luckily enough ,UVb radiation disperses really much.
Specially from those reptile basking CFL's ....
Put the mature plants (to be harvested soon) as much away from the cfls ,which are/will be over the tops of 'newcomers' ,in the 'perpe' ..

Ok cool. I have 4, 4 foot T-5s

If I were making RSO from the whole plant I might consider trying to mimic the suns UV veg through flower. I've heard that you really don't see a noticeable difference from running it for more than the 5 or 6 hours in the middle of the light cycle vs running it for 12 in flower.

Dealing with time in a perpetual grow that uses 24 hour flower and veg lighting is....difficult.

Live in the aloha state...I can get a sunburn anyday of the year. That's kinda what I meant.

I try to keep things as simple as possible most times. No uvb left something to be desired compared to my outdoor homegrown. The full 12 uv in flower finally closed the gap between outdoors and in.

So...while I may lose a little potency...I haven't noticed it..quite the opposite. But can't argue against a study of course.

what I did notice was stronger smells, and more oils in the bud..not so much trichomes. And that happened more so in my setup with 12hrs versus less. Lots of variables that changes that for everyone of course. Bulbs, area, etc...

so for me...simplicity rules. 12hrs low dose...and less timers and schedules.

but this is my opinion now and will possibly change as time moves on and experience grows. I do thank you for those extra steps you have shown, it's the first time I've ever heard that system.

I will probably test the potency theory eventually but it will need to be quite noticeable to make the scheduling worthwhile. For now the extra terpenes and goo are good enough. Not to mention I get stoned enough as it is..lol...don't really want it more potent.

hmmmm.....milk n cookies does sound good

I have read some different views on UBV so I will play it safe for now. 2 Plant's are 4 and 6 week's from seed. Start today with 1/2 hour UVB. In 1 week increase to 1 hour. I will double time each week until it hit's 4hours and then reverse the step. May have to change time a little as I go.

I'm going to run them 15 min. on, and 45 min. off to start.

One last thing that I have to say...
During all the time,I've already dedicated in plants,artificial environments and light ,I have learn one ...rather important thing ...
Kinda of a 'rule' ,let us assume..
That applies to many ,if not most of the aspects of ' indoor-space-underground-etc horticulture '..

See how things 'work' in nature ..
Study them...Try to analyse them ,find out the reasons why,try to understand the complete picture,etc,etc....
But DO NOT try to immitate them exactly ,in an artificial environment for plant growth ...
No..It will be way complicated ..You need a 'hand' from a computer system ...
Way expensive ...Even DIY ...Lots of hours of programming ...Too much time,effort and money ...


So Stay 'stupid simple ' in some ,if not most aspects ...


Now ...Uvb ...

My advice is to start Utilising UVb from the very begging .
Same duration As the rest of the lights ...18 hours leds ? So,18 hours UVB ...
But have the lamp away from youngsters ...

As time passes the lamp gets lower ..
In peaking weeks,maybe another one is added ...
12 hours UVB as the rest light,in flowering ...

Then ,step backwards ...

Move away the lamp ...

And at the final 15-20 days ,no UVB at all ...
Or very-very little ...
( lamp(s) way up ,high or far away ...
See lamp specs for irradiation patterns )

stardustsailor said:

One last thing that I have to say...
During all the time,I've already dedicated in plants,artificial environments and light ,I have learn one ...rather important thing ...
Kinda of a 'rule' ,let us assume..
That applies to many ,if not most of the aspects of ' indoor-space-underground-etc horticulture '..

See how things 'work' in nature ..
Study them...Try to analyse them ,find out the reasons why,try to understand the complete picture,etc,etc....
But DO NOT try to immitate them exactly ,in an artificial environment for plant growth ...
No..It will be way complicated ..You need a 'hand' from a computer system ...
Way expensive ...Even DIY ...Lots of hours of programming ...Too much time,effort and money ...


So Stay 'stupid simple ' in some ,if not most aspects ...


Now ...Uvb ...

My advice is to start Utilising UVb from the very begging .
Same duration As the rest of the lights ...18 hours leds ? So,18 hours UVB ...
But have the lamp away from youngsters ...

As time passes the lamp gets lower ..
In peaking weeks,maybe another one is added ...
12 hours UVB as the rest light,in flowering ...

Then ,step backwards ...

Move away the lamp ...

And at the final 15-20 days ,no UVB at all ...
Or very-very little ...
( lamp(s) way up ,high or far away ...
See lamp specs for irradiation patterns )

Click to expand...

Sounds like you kinda know what your talking about, I have heard(read) the same thing before. So eat a cookie and reprogram I will. I am having a senior moment. Learn something new every day.

Thought I would give you a comparison between T5 HO UVB bulbs from a USA cost perspective.
Arcadia is a European company
ZooMed is USA based
Both bulbs are manufactured in Germany

Arcadia 12% UVB 30% UVA $33 + $12 shipping $45 total
ZooMed 10% UVB 30% UVA $18 + $5 shipping $23 total free shipping with a $50 order

Arcadia is a stronger bulb but not sure it's worth the difference in the USA,may be cheaper to buy the Arcadia in Europe than the ZooMed.

Zoomeds are way expensive here ( 70 Euros ) at local pet-shops (South-East Europe ).
But Arcadia are quite cheaper ...(25 Euros ) ..

I'll pay the extra for the extra.