MIGrampaUSA
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I can tell you what California Lightworks UVB light directions say. It's what I bought. Quality in my eyes is sub par so stick to the reptile lights. According to California Lightworks, UVB works best if used mid flower through to harvest. They recommend starting at 1 hr on in the middle of the light cycle and then increasing the time by 1 hr every week. This is what I've done.Can someone on here tell me the suggested amount of hours that UV reptile bulbs should be running during veg? In my 18 hour cycle Im running the bulbs for 30min at a time spread out 5 times through the cycle. So in total 2.5 hours for an 18hour cycle. Is this too much? Too little? any info would be helpful thanks.
Oh yea, you don’t use UV spectrum in veg lolI would say wait till flower. Not sure what the end goal is running it in veg is all I'm saying. If the goal is to produce more terpenes and trichomes, a plant isn't primarily focused on those things in veg.
OK. This is good to know it will save me on electricity costs. During the 12/12 how many hours of runtime per cycle?Oh yea, you don’t use UV spectrum in veg lol
Start at an hour in the middle of your daylight cycle. Increase that time by an hour every seven days. Depending on exactly when you start and how long it flowers ... 4 hrs and in some case up to 6 hrs. You don't need to run it the full 12/12. For example., I run my lights 9:30a - 9:30p. Mid day would be 3:30pm. The first week I ran it between 3pm and 4pm. The second week between 2:30pm and 4:30pm. And so on. I'm at 4 hrs on now. I expect to harvest over Christmas. At that time, my uvb will be up to 5hrs time.OK. This is good to know it will save me on electricity costs. During the 12/12 how many hours of runtime per cycle?
OK got it. And also sorry fellas for asking the same question multiple times for whatever reason I didn't refresh my browser to see that you already answered this a little bit ago. I will go in my garage and shut off the UV now. I will wait until I am half way info flower then I will start with 1 hour a day in the middle of the lights on cycle. Each week I will add an hour until I hit a max around 4 like you. Thanks.Start at an hour in the middle of your daylight cycle. Increase that time by an hour every seven days. Depending on exactly when you start and how long it flowers ... 4 hrs and in some case up to 6 hrs. You don't need to run it the full 12/12. For example., I run my lights 9:30a - 9:30p. Mid day would be 3:30pm. The first week I ran it between 3pm and 4pm. The second week between 2:30pm and 4:30pm. And so on. I'm at 4 hrs on now. I expect to harvest over Christmas. At that time, my uvb will be up to 5hrs time.
This is how I did it. Others might have approached it differently. Most people will tell you to start slow and build up the time as you go.
This was very informative thanks.
Either (2) 2’ at the ends at same height or just one 4’ on either side same height.The reptile bulbs are much milder than the tubes. I’m not sure how effective they are for plants?
My problem is a quantum board in a 4x2. If I hang a tube above it most of the light will be blocked by my led.
What do you have running and size of room. I’m gonna ramp this up big time based on what your saying. At about 45 minutes a day now.Start at an hour in the middle of your daylight cycle. Increase that time by an hour every seven days. Depending on exactly when you start and how long it flowers ... 4 hrs and in some case up to 6 hrs. You don't need to run it the full 12/12. For example., I run my lights 9:30a - 9:30p. Mid day would be 3:30pm. The first week I ran it between 3pm and 4pm. The second week between 2:30pm and 4:30pm. And so on. I'm at 4 hrs on now. I expect to harvest over Christmas. At that time, my uvb will be up to 5hrs time.
This is how I did it. Others might have approached it differently. Most people will tell you to start slow and build up the time as you go.
I have this set up with a Growers Choice ROI - E720 running at 100%. It's in a 5 x 5 x 80" tent. Two 24w California Lightwork's Solar UVB hang through the space of the bar light. This grow will be wrapped up in a couple of weeks.What do you have running and size of room. I’m gonna ramp this up big time based on what your saying. At about 45 minutes a day now.
Nice interesting to see how it compares.I have this set up with a Growers Choice ROI - E720 running at 100%. It's in a 5 x 5 x 80" tent. Two 24w California Lightwork's Solar UVB hang through the space of the bar light. This grow will be wrapped up in a couple of weeks.
I bought two 150w Reptile lights to run in my 6.5 x 6.5 x 80" tent. These have not been used yet as those plants are still in veg. Still to be determined ... I might add one more to that tent.
Maybe generations of indoor-growing has suppressed beneficial genes, and running uv from seed to finish based on the daytime/yearly Sun uv index would wake those genes up. For example, the uv index shows the uv starting out low in the morning and increasing to mid-day and then dropping off till nightfall. So some kind of uv light controller to replicate that increase/decrease of uv might be the best way to go about it(?).I would say wait till flower. Not sure what the end goal is running it in veg is all I'm saying. If the goal is to produce more terpenes and trichomes, a plant isn't primarily focused on those things in veg.
Yeah, reading through that link really just makes me think that it's a genetic/s issue. Many generations of growing indoors with no uv may have suppressed the genes that are normally active outdoors. Exposing those supressed lines to uv is bound to cause some problems. I think that their study should have taken place over many generations to see if there was any improvement. 2¢https://www.frontiersin.org/articles/10.3389/fpls.2021.725078/full#:~:text=The present study suggests that using UV radiation,cannabis yield or inflorescence secondary metabolite composition. Introduction
The present study from 2021 suggests that using UV radiation as a production tool did not lead to any commercially relevant benefits to cannabis yield or inflorescence secondary metabolite composition.
It actually decreased terpenes and THC.
Yeah, ignore that BS study, it's rigged, twice.Yeah, reading through that link really just makes me think that it's a genetic/s issue.
"Dutch Passion, one of the worlds oldest seedbank companies, has tested the MIGRO UVB to determine the effect on terpene levels. They ran a controlled test in a side by side grow, one side with UVB, one without. There was a 19% increase in terpene levels under the UVB fixture, some terpenes increasing by almost 50%. Increased terpenes mean increased flavour and smell. Research also indicates increased terpene levels can lead to a more complex and satisfying effect when consumed". LINK
Ive been using this rig for a couple months.
Went right over my headYeah, ignore that BS study, it's rigged, twice.
Genetics used:
‘Low Tide’ (LT) and ‘Breaking Wave’ (BW)
both high-CBD strains (!)
UV doesn't work on these chemotypes
Then, 400ppfd for flowering lol. It's also established UVB works better with high irraduance, because the photorepair then works better 400ppfd is starving a plant.
I need to correct this toGenetics used:
‘Low Tide’ (LT) and ‘Breaking Wave’ (BW)
both high-CBD strains (!)
I need to correct this to
"mixed"-chemovars, but still, both carry more CBD as THC and are labelled as 'medical' strains. That means that at some point in time the ancestors of these strains had been crossed with a 'high-CBD' chemovar. And these are known to not respond to UVB treatment - as Lydon back then did demostrate.
His original paper actually goes into great length to discuss the various theoretical explanations and these alone give insight into a broader understanding of all the interrelating factors that can trigger a higher cannabinoid content.
The CBD cannabis types originate from East-Europe, even north & middle Asia and these have been separated (by human domestication) already 3 thousand years ago from its original habitate in central Asia.
Most strains today cultivated or sold are actually type-I high-THC chemovars. But most of them are polyhybrids, and there is no proof that all those genetics still are able to respond positively, due to loss of responsible genes. Over decades of "non-UV" HPS or LED cultivation it won't matter. But the science occassionaly still hands out a study or two showing how moderate or pulsed dosis of UVB creates a number of positive effects. The plant can easily repair, compensate the damage (plants do have energy surplus) but what follows in response is a cascade of internal reactive pathways that beneficial. It's a way to induce systemically acquired resistance.
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