How does UV light affect plant growth? feat Dr Bruce Bugbee and Prof Erik Runkle
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- Опубліковано 6 лют 2025
- Why use UV in the grow room? Read more here: migrolight.com...
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I run through the affect of UV light on plant development including the science behind the use of UVB to increase terpene production which improves the smell and flavour of herbs. I share extracts from interviews with:
Dr Bruce Bugbee, bio. here: www.apogeeinst...
Professor Erik Runkle, bio. here: www.canr.msu.e...
and Andrew from Bridge Farms in the UK, link here: www.bridgefarm...
Bruce Bugbees latest video on UV lighting for plants:
• How Ultraviolet Radiat...
Some interesting research on the affects of UVB on plant development including Cannabis here:
silassativariu...
lcb.wa.gov/pub...
www.karger.com...
citeseerx.ist.p...
Some helpful videos on Terpenes and Cannabinoids:
• Video
• Terpenes in Marijuana ...
• Cannabinoids and Terpenes
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Could you please test out the new lumatek uva-uvb lights.big lumatek fan.
YOU AND BRUCE SHOULD PARTNER UP ON A COLASAL 500 WATT INDOOR FIXTURE THE PINICALE OF FINE ADJUSTMENT WITH UVC SET TO GO ON 2 SECOND TWICE A DAY
@@foofooblenda734ufc for what, ufc dosent Effect on mj -.-
I've been told two ways to use uv. One is before and after the light cycle, and the other is during the light cycle 15 minutes every hour. What way should uv be used?
Yes! Finally there is legit UVB research, mannnn. I love this, ive tried to get more people to use Arcadia little knockoff reptile bulb, and now we get legit science into UVB and hemp etc. You all rock, I love it. Thank you so much MiGro and Bruce at Apogee Instruments. This is next level UVB researched ive begged for years
I hope you get this. I was wondering whether u can use the lizard lights.
@@reefonbux9432 Many of the Flourescent UVA/UVB lamps used for supplemental growing effects are Reptile lamps.
If using Reptile lamps only, IDT any plants could grow? I mention this because many people over the years have mentioned using "Black lights" only, when speaking about growing indoors.
IDK where this Myth started? Maybe older movies, or something in pop culture..?
I believe Shane has a video comparing different Reptile lamps and their spectrums, on The Migro Channel.
@@timturk1899 no, I'm not talking about using them for veg at all. Specifically last month of bloom as a sup light.
@@reefonbux9432 Thats what I'm thinking about trying at some point
I use the arcadia uvb flourescent bulbs , started back in 2018 .
I use the high uvb bulbs for desert reptiles .
Guidance on using the MIGRO UVB and ARAY together:
The surface area of the ARAY is about 20% of the surface area of the canopy it covers. This means if the UVB is above the ARAY 80% of the UVB photos will reach the canopy. Also the UVB fixture is 2ft or 60cm long so UVB photons from some part of the fixture will pass the ARAY led bars at different angles to reach all parts of the canopy.
The hanging height of the UVB is 2ft or 60cm, way above the the ARAY hanging height of 6 to 8 inches or 16cm-18cm minimum. UVB photons will fade the colour pigment of the ARAY over time but will not cause much bleaching as it is only used for around 30 hours total per growing cycle. It would be the same fading as leaving the fixture in mid-day sun for about 10 hours.
Would you still recommend 2hour per day for the last 2 week?
Why UV-B and not UV-A, according to bruce bugbee UV-B burns the plants just turning it on 1 or few hours a day!
What’s not discussed is an exact method for administering the UVB supplementation for tangible results..pretty much, here’s your UV bar, go to town…i have used UV before and I am not swayed…we need to know exactly how to administer the UV..
@@lucianthepurifier___412 He said LED s can produce UVA effectively but is much less powerful to the plant. LED dont produce UVB economically. 1 photon from UVB is 100 times more powerful than UVA. UVC is much more damaging than UVB. Glass filters out UVB. Some UVB is good for people in the right amount. Some UVB is good for plants, in the right amount.
i know im asking randomly but does any of you know of a way to log back into an instagram account??
I somehow lost my login password. I would appreciate any assistance you can offer me!
Hello from Elusive Strains USA - We have followed your channel for some time and wanted to give a big thank you for giving the community accurate information. We have used UVB for many years as it does indeed have a positive affect not only for flower but for the health of our seeds.
Hello! So how do you use it? When, and how much?
I would love to know more!
Yeah how do you use it? 🤜😐
@@MrRiverGrove Last 3 weeks of flower, have the UVB fixture come on for 2 hours (might get away with 3 hours) in the middle of your light cycle WITH your light cycle. So if you are on a traditional 12 on/12 off, you would want to just have your regular light come on for 5 hours like normal, then have another timer bring your UV fixture on for its two hours, have it shut off, and have and have the remaining 5 hours be just your normal lighting LED, HPS, etc. We want to act like the UVB is running when the sun would be at its highest point/most intense during your relative light cycle.
Hope this helps
don't suppose you guys would have any info on the effect on insect pests and resistance to pests and moulds.
I have several runs with your UV-B fixture now n can say that it does make a huge difference in my grows. 1st off the MIGRO bulb seems much brighter next to a Solarcure fixture. 2nd, the plants respond to the UV with lots of trichomes n colors. I run 1.5 hours a day through all of flower. At harvest we often see that the colas n leaves exposed to the UV show the colors while the bottom branches do not. Thnx for the videos and the awesome lights. I have my 1st array4 on the way and can't wait to hang it.
Thanks Shane, I have your lamp on its way!! Love everything you do!! Peace and love from 🇨🇦!
Day 8 of running them and very big difference, just 2hrs a day. Using your recommendation, thanks Shane.
the florescent ones or led?
Awww yeah, Dr.Bugbee is the man for sure! Great video, can't wait to see what the future brings with the new UVB technology being implemented and put to use.
Agree'd. Currently I am growing peppers Chinese basil and a sativa/indica. Using a reptile bulb pulsed for an hour or so a day. Definitely getting some cool purples
Been running uv & IR for about 7years…..undoubtedly more resin more colors and flavors, it has come built into Kind lights for years and it’s adjustable, I just use it during flower! I fall on the floor laughing every time someone with a mars says I’m overpaying for my kind Led! Been trying to explain for years that I’m buying the spectrum
This has been known for a very long time and was found when kush was first taken from India from the hindu kush mountains as it grew with very high UV in the altitude of where it was first discovered and works best with kush variants of cannabis the plant developed more oils and thc as a uv defense
That really makes sense because the higher the altitude the more UVB and UVA hit the plant 🌱
you think it 'helps' for pure sativas (e.g. malawi, thai, Jamaican, Panama...) aswell?
@@slurpyterpy447 if it's in its dna it will work sativas come from arawnd China a long time ago but have been grown just about everywhere at some point in time. so if it has picked up that mutation it will work . the stubilaty of the genetics will make a difference to as two seeds from the same plant some time hold different mutations from parent plant ... if you get wot I'm saying
@@slurpyterpy447 In theory it should help all plants regardless of genetics and strains, because outdoors they all get UV. It's just that some will benefit more, and some will benefit less.
Shane is the Boss love that guy. Im using his Produkts for a while now and its just supperior to everything else i tryed keep up the good work.
I received the MIGRO UV-fixture during the flowering period. It is difficult to say how the effects are, but it definitely didn't hurt the plants. They turned white all over, and I will definitely try it again.
Do I run the UV lights same time led lights are on? Or 2 hrs when lights go off??
@@scarcorleon I use the UV lights with the timer set to start around the middle of the "daylight" time. With auto flowering plants I avoid having it on during outside daytime hours to avoid any extra heat as the climate where I live is very warm. This offset from the middle of their daylight time has shown no difference to the flowering plants, as far as I can judge.
he said he was no expert and they are still on a learning journey thats what we need less ego and we all can keep learning
Just got an Agromax 2ft T5 Pure UV bulb. For the first time in over 3 years I'm excited and happy about a purchase.
I got 4, just started them up 8 days ago for 2hrs a day and the trichome production is off the charts, also seems like the leaves started filling in possibly as protection as well, which I've never seen at day 55 of flower, This is already into fade, so leaf growth is unusual.
how high do you keep them?
@@BigFarm_ah365 how did it workout?
Do I run the UV lights same time led lights are on? Or 2 hrs when lights go off??
Ive been using uva and b in my flower tent for a few grows now and the colours i see when the fade comes on is especially notable. the flavors have been great as well! the note on dating a day off between the uvb treatments is a neat thing I am going to add to my schedule. cheers!
Glad to have you making videos again Shane as always good video good information have a good one God bless.
This video saved me from making a mistake buying a junk UVA LED... Thanks Shane.
Love the scientific approach of the channel.
Thanks.
Got my 310 two weeks early!! I mean... Wow
This addition brings a luggage full of awesomeness.
Thanks Migro 🤘
Enjoy!
Very interesting!! Can't wait to see more research on this. Would love to see some more research on sound waves and the benifits
Bose did research on this in grapes.
They found out playing Bose speakers with classical music increased growth and increased sugar/brix in the plants, results were better flavor in wine produced at the vineyard with Bose Speakers. This is also proven in the Library of Medicine, plants with a certain vibration literally grow to the vibrations of certain hertz frequency. This is found in the tax payer funded Library of medicine pubmed search page, in many studies. Next level stuff, for sure
Also it reduced pests in the garden.. a double whammy to use this idea...
Look below for the story
"The network of speakers that delight Paradiso di Frassina’s vineyards 24 hours a day with the complex and lively harmonies of Mozart also allow the winery to reduce vineyard treatments, so no chemicals are used to protect the vines. Stefano Mancuso, a plant neurobiologist with the University of Florence who gave a talk on the roots of plant intelligence on Ted, has been studying the Mozart vineyard since 2003 and has found that sound dramatically reduces the number of attacks from insects and parasites who remain confused and unable to locate one another for mating. Birds and other animals who like to feed on the grapes also stay away, so there’s no need for the use of pesticides!
The company Bose heard about these studies, donated 72 speakers and financed more research."
I’ve been meaning to get a couple radios In my tents for a few years now. Jus keep forgetting an being lazy but I’m gonna try it this time. Classical fm ftw
@@dertythegrower I have some speakers in my tent. I play a specific hz when feeding the plants and they love it!! I
Could you please let us know more about it? It's very interesting.
Thanks Shane!! Awesome information and a legit light!! 🙏✌️💚💨💨🤙
glass reduces the amount of UVB/A that reaches the canopy in a greenhouse or through a window when growing at home. UV exposure at safe amounts (for your plant products) encourages the plants to develop stress responses. Those stress responses can and often improve taste/colour for meals and even resale; as for Cannabis, does UV exposure create a greater concentration of trichomes due to this stress response? The 'increased potency' referring to the greater number of trichomes is where I'm thinking this product improves yield. I purchased the UV310 light from your store in late 2020 and can say it improves our food growth with taste/resins and the colours are more vibrant than with no UV supplementation.
As far as I know the best, high output ~280nm UV LEDs are now about 8% efficient (up to 1,5W, 6,5V / 230mA). Still far away from ordinary LEDs but getting better year by year.
My main problem with the ones I know about (in addition to the price) is their extreme sensitivity to heat / short lifetime. Already at Tj 45°C they loose 30% of their output in 3000h-4000h.
And at Tj 55°C they loose that 30% in 1000h-2000h.
So you need very good heatsinking to get reasonable lifetime from them. When driven at 1W with ~26°C heatsink Tj 35°C looks possible. This might result more acceptable ~8000h lifetime.
I like that video. My plants have had good soil mixed up, ph 6-6.5, 4 different and tried different led fixtures but the terpene profiles really suck. I'm going to try an uvb light and hope it's better
Thank you once again
What a benefit you are to us
Thank you for sharing such valuable information with the world 👍 Keep up the good work 😎🤙
how much does this impact yield? i hear there are negative impacts to yield but is it a significant impact?
Can you please make a bracket that fits this light to your arrays??
Hi Brendan,
The hanging height of the UVB fixtures is 60cm from the canopy, the ARAY fixtures hang much lower than this.
Any chance we could obtain how many UV lights/plant and grow times please?
show shane our appreciation buy migro
I have 2 lights lol and use them every grow
the man has gone above and beyond for free you never see that with truth what ever it is thanks Shane ...🇺🇲
Currently testing lower energy UV-C, 200nm-230nm @ 3ms-8ms exposure Per Hr (1.5w SqFt)
Also...Discovered utilizing a 20 minute 10k led pre light, as a Phototropism lure, increases amount received .
Time will tell...
so the dr said not every day the last few weeks of flower, does that mean Monday its on for 12 hours, but not Tuesday , Wednesday but not Thursday? so just every other day?
Yes
Ty. I’ve actually heard before it had no real effect. This is great info. Keep it up!
Always learning.... really enjoy your hard work and quality of products. I used my (2) 310 UVB last two weeks. I saw the difference after one day! It Made a very pretty shield to protect that reproductive system. Very exciting....!
This is a awesome video. I cannot wait to try something similar to this with tomato plants and such. Super curious to see how it will work out
Hey Shane, I ordered one just to support you and to give it a try. What you say sounds good, but I only believe what I can replicate in my own garden. Will report findings.
So, any updates?
Great talk. Cheers from New Zealand.
Nice to hear from the southern hempisphere!
how long do the bulbs last, and how much are the replacements?
Thank in advance for your time
Good on ya for taking the time to get back in the past as well! Cheers
5,000 hour lifespan, link here: migrolight.com/collections/all/products/migro-uvb-310-fixture-and-fluorescent-tube#
@@MIGROLIGHT thank you, I found it in the store.
I really appreciate all of the information you share. I wish your products were available in the US, but regardless thank you for the efforts you put in to these videos.
I just bought IR and UV light bars from Marsh hydro I'm very excited to see how they work ✌
I use the Agromax Pure UVB T5 bulbs. Been working great for years.
People have been using the reptile UVB bulbs for years, that brand and Arcadia. But now, MiGro is taking over the game apparently for us growers. Awesome!!!
i have a bunch of t5 ho fixtures i could maybe get UVB bulbs for. how far away from the canopy do you hang them?
@@professor4202 start out about 36 inches. It dosen't take much. Ive got 2 two foot T5s in a 5×5.
@@dertythegrower yes sir.
The only problem with the reptile UV t5s tho is the UV-B emitted is max bout 10%.
The Agromax Pure UVB T5 is 80% UV-B and 20% UV-A.
Migros is pretty close to the Agromax. Just Migros is a T8 fixture tho.
@@timpage5021 Personally i would prefer the weaker reptile bulbs so i can hang them lower, or from the sides. With powerful UVB you have to hang 60cm above canopy, and that is above the lights. With Migro lights it may work nicely but not with other lights. Especially if your main light is 40cm above canopy, that means the UVB is 20cm above the main light. It could damage it i think.
Can i get two, over canopy one under, same two hour schedule
Hi so if I put for 15 minutes per day the last 2 weeks on flowering it's ok
thank you for your hard work bud
Thanks Shane, informative as always.
*I use 2 panels of 395NM UV LEDS lights / 100 Watts each during the last 20 days of plant life. I put them right beside the buds and you can watch the trichomes triple in size on the UV light side. The plant also becomes up to 200% more potent.*
full blast all day?
Lies
@@martymcfly9342 *Sad you have not even tried it.*
The older model Philips TL40W/03RS works. Not in the current Philips catalog, but "compatible" tubes are available online. Intended for salt-water aquariums, they're Not medical tubes, but do have a lot of UV-B. There's one catch: standard White enamel reflectors do Not reflect UV. The usual fluorescent bulb fixture must be lined with aluminum foil so it relects the UV. One-tube fixtures w/ reflectors are hard to find, so the smallest, lightest, two-tube fixture will work with a single tube. They can fit in a four-foot tent if they are hung at a slight angle to horizontal, on opposite sides of the tent, and halfway between the plants and the main CMH bulb, pointed at 90 degrees to either side. ( not facing down ). Two hours in the late AM, and two hours in the PM should be enough to trigger the response, but since the additional electrical cost is low ( 80W ) keeping them on for longer wouldn't hurt. Wear UV-proof sunglasses when they're on.
Hi, could you please tell me which side of the aluminum foil is better? The shiny or matte? I would assume the shiny side but i'm asking just to make sure. Thanks!
@@twentytwo138 I used the shiny side, but aren't really sure if it makes a huge difference. A side-by-side grow might settle the matter, but who has the time?
I’ve been testing uvb (fluorescent) seen moving away from cmh to LEDs and this video is spot on.
3 thumbs down in the first minute of the upload. Lots of jealous people around... thumbs up 👍
I was gonna say the same thing lol.
Exactly!
LOL. I am so happy this UVB talk is getting big now, ive talked about it for years on Hash Church and icmag, and all the UVB cannabis videos (the couple that are around ha)
@@dertythegrower I seen Shane's vid a year ago with the Herb and Spice Guy and was Interested Then. He played a clip of it in this vid.
@@dertythegrower
No doubt, I have been playing with uva and uvb combos off and on for decades! .Is anyone out there using a 20:1 ratio uva to uvb ? I was told this is close to the natural sun spectrum .?
My thoughts are to dial in the origin of the strain and then replicate that spectrum from where it comes from....just throwing some ideas out there ..All my theories and conclusions have been from 25 years of R&D..trial and error.
This is why greenhouse produce lacks as much flavor as under the sun,
One part of this trigger process is Brix levels shoot up fast! As well as cooler temps ..Did a bunch of side by sides not even close!
I would assume sometimes at least they are pressed by accident. I’ve hit the dislike button so many times on my iPhone without realising. It doesn’t notify you like it does when u like something so often you just don’t notice you disliked it.
Can you please do a review of California Lightworks Solarsystem UVB?
We need to leave this subject sit until we can wait for technology to catch up were still in the very early stages!
Enjoyed this video thanks mygro
UV technology is already out there and many people use it in their grow.. It's just that LED UV are still not there yet.. If you don't use UV, you're missing out.. If you use MH/HID/HPS then you have UV already
CMH seem to have the most complete over all spectrum but yes MH and HPS or Ceramic HPS have more than LEDs plus they have far reds, however, there hot, expensive to run and not very dimmable. Best bet is full spectrum LEDs with UVA/UVB supplemental lighting in the form of a fluorescent bulb with UVB being the dominant spectrum. LEDs just don’t have the right mix yet for UVs. I just bought Migrows UVB fluorescent to add to my 1,000 Medigrow full spectrum EZ-8 LED. I bought 8 of them. I’m more than confident. Thanks Migrow. I researched it all for myself and he’s correct folks.
should you run the ir and uv all the way through flowering or just towards the end
My question is how does uvb travel? Like the light you offer, how far does it travel? What kind of coverage does it have? Is it like basic light, do i need 5 of these things to cover a 4x8 or does it travel further?
The 20w fixture will cover up to a 4x4
How much are they for a 4-bay 4 mate how many watts does it pull from the wall
@@MrWater99844 they're like 85$ and pull 20 watts.
@Tim Page thanks a million mate for getting back to me would you just run it longside your normal light and in the last 3 weeks is that right mate 👍
@@MrWater99844 yes absolutely if you haven't introduced it earlier then yea. If only useing it for last few weeks of flower id put it on a pulse timer and run it mid day light cycle 15 minutes on 45 minutes off
15 minutes on 45 minutes
15 minutes on 45 minutes
15 minutes on 45 minutes on.
Say like if your light comes on at 6 am id start the UV light at 12.
I have other grow lights in my space so how do i add in my UVB fixture around it?
@Studio8 did you figure it out?
His directly into the uvb light, thought ur not suppose to be under it and also suppose to wear sun glasses /ppe?
what type of light do you get with the blue red lights low watts
Migro please here me out... I'm a wild grower.. in the wild can a light be made for veg like in June uv light mimics the sun or flowering light that is like the sun after October 15 ,,, these are the 2two sun lights that I count on out in the wild grows???
We are seeing larger led lights containing an added diode for UVC. Given that the diodes already produce a small amount of UVC, do you think this is necessary for optimal growth to use lights with these diodes or overkill?
Hi,
Plants are not exposed to UVC light outdoors, it's not necessary and can damage plants.
@@MIGROLIGHT My bad I think I must have meant UVA. Thanks for the swift response though! Oops :/
Running both a MIGRO 310UVB and a California Lightworks UVB in my 5x5 for 90min last 2 weeks
Every other day? (As the video suggests)
I really like your channel keep up the good work
Unfortunately all research links in the description are dead?
Very Strange%:""
Hi, I copied and pasted them incorrectly, should be ok now. Thanks for letting me know, Shane
@@MIGROLIGHT ,
In your opinion, which lighting strategy would be more efficient and effective for cannabis at the seedling stage, directly following germination? T5 or a LED Grow light on a Veg. setting?
Which do you use, and have you executed an experiment on this topic? I thoroughly admire your research and would greatly appreciate your opinion.
-Loren
I have a Seasonal Affective Disorder light, it's it's biolight, I haven't touched it yet ,as it can be dangerous. But I was wondering how long I could apply it, 30 minutes a day at a few feet? I have no way of testing it's output but it's a 2 foot light
Extremely useful video, thank you! I almost got a migro light when I upgraded but I had to go with something else just for budgeting reasons.. I do plan on getting that UVB light though!
I am very interested in this UV lamp. Just a question, this lamp contains 75% UV-B is it enough to treat plants against powdery mildew.
I'm also interested in the pm treatment aspect 🤔🤔🤔
Very interesting information thanks bud
Do you know if Dr. Bugbee is going to accept the invitation to appear on Adam Dunn's show on 5 May, at 3:20 Pacific, to have a discussion in which conventional photobiology and Quantum Photobiology are compared and contrasted? If not, how about you doing such a show and letting me speak on Quantum Photobiology.
don't suppose anybody would have any info on the effect on insect pests and resistance to pests and moulds.
Imagine. A UVB robot that lasers leaf data into the robot, and then flashes UVB onto each plant that is deficient in UVB!!
Wow, this is going to be invented. This is next level stuff
Wouldn't it make the most sense to switch from LED's to CMH bulbs around the last 2-3 weeks of flowering, then? Seems that would give by far the best result.
Good as always and very informative. Im using it in my new setup to test the fruiting capsaicin. I upload it in some days!
Thanks for the Video with nice facts driven charts, experts oponions and all the good stuff ;)
I’m looking for some research specifically on implementing it as additional supplemental lighting in my grow room because my grow room is growing so much with a abundance of different types of plants no longer just tomatoes as we call them 😂
No one that I have heard has mentioned the Cirrus UVB light bar that was given an award by High Times in 2016. I just bought 2 of them.
What brand and where did you get them
@@hectorcalderon3011 Cirrus they are based in Portsmouth NH. They changed company focus to high definition digital commercial displays. These were new old stock.
ANOTHER GREAT VID. Thanks Shane
So what is the besf way to apply. I have heard 2 hours a day in flower. Are they say sayinf shorter burst every other day?
Ok ok ill buy your light. Yours is actually the best bargain that has honesty in marketing....we hope lol I'm sold
I don't know....I have both the MIGRO and the California Lightworks and the CLW was cheaper and is a higher wattage.
@@smokeyBJJ , I got the CLW as well. It's only 24 watts. With mine, they were rammed so hard into the box they got bent. The plugs don't fit tightly, and fall out with minimal handling. Of the 3 varieties I was growing, only one responded noticeably to the UVB. I started at 15 min, and ramped it up to 2 hours a day in the middle of the light cycle. Any suggestions?
@@pursaveer9027 start at 2 n go up to 4 hrs
@@pursaveer9027 no problems with my power cord or fixture. MIGRO is 18w vs CLW 24w
@@smokeyBJJ Do you have a link cheapest California work I could find was a 111 migro is 85 but 101 altogether with shipping
Hi shane thank you for an awesome video as always 👏👏 one question I have about uvb diodes like the ones we find in the marshydro and argox ect, are they just for show or do they work ? As you explained florescent are more effective if not the real deal compared to the diodes, would really love to know about it as been building an led light and wandering if it's worth the uvb diodes, thank u in Advance
Keep up the good work
I have not been able to find any good information on a schedule implementing uv in my grow. I actually have the AgroMax uv bulb but it looks to be the same spectrum as the migro UV. I am wondering if you can give me a recommendation what time the schedule I should run it on in flower especially. I also saw Bruce Bugaboo say that you be in veg is beneficial and I am wondering what schedule you would use in the veg cycle?
Cheers Shane! I have a Solarcure UVB but looking at it comparison to the Migro setup I’ll be ordering a couple soon.
Hey can you do a review on Luxx lighting LED?
What is needed is a light fixture that has a seperate uv light that you can turn on when required. Switching lights in and out of the grow room would be too much of a pain
You don’t switch lights out, you run your uv with your led at the same time. You only run uv the first hour your led comes on and the last hour before it turns off
@@trademark256 That is incorrect, you are thinking of IR and Emmerson effect i believe. UV should be used in the MIDDLE of the light cycle, to stimulate noon when the sun is at its peak. Your schedule would mean that the plant gets UV in the morning and before sunset. But in nature those periods produce the least amount of UV.
Also, if you use a more powerful UVB like the ones you mentioned in the video, it's gonna burn the plants if you run them all day.
@@twentytwo138 so when should I use the uva lights? In flower I run my lights from 9pm til 9am. I have 2 HLG 30 UVA in a 5x5 tent
@@scarcorleon Then by your light cycle UV should turn on at 2:00 AM and off at 4:00 AM.
I apply it like a sunrise and sunset for the last few weeks
Oyy,". Call me old fashioned but I Will always give my greens' n' purps' an hour or two of Actual 🌞 when possible or applicable .
But do appreciate your work 🍀🍀🍀🍀🍀 ! .
good stuff shane well done
How would one use it for a perpetual grow? Is there a recommended schedule if plants at different stages are in the tent? Thanks in advance
IMO ignore the part you hear everywhere online about 2 weeks in flower. The sun doesn't work that way. You heard the scientist talk about cuticle strength and compounds that doesn't happen in 2 weeks. Spend the money on a uvb meter then aim to start out at 40-100 microwatts 15 minutes a day during veg. You'll work your way up to a few hours a day depending on the strain. If you find the limit dont push it, back way off. Uv is also bad for plants even when they look healthy. You want just a little to stimulate the benefits. Maybe push the limit for those magical 2 weeks in flower everyone mentions but imho always give the plants uvb just small amounts. If you flower perpetual then just keep it small doses and maybe let the later stage get closer to the bulbs to up the intensity without messing w the duration affecting whole room.
@@prescribedburn1068 Is there any way to determine the 40-100 microwatts without an uvb meter? At least approximately? For example what wattage should the bulb be, what percentage of uvb/uva, how far from the canopy etc. thanks!
@@twentytwo138 a bunch of that is type and strain dependant. What I can say best about the lights are in regards to 4ft T5 uvb is to start about 2 or 3 ft away.. so not to shadow whatever your main light source. Use the lights for about 30 minutes a day for a few days or week. Then slowly start increasing runtime. There are studies out about multiple cycles per day having good outcomes but that's harder on the bulbs. Works just fine to run once. Too much uvb will kill the plant. Almost too much will stunt the plant growth noticeably and a little too much will slow it down but you won't see it. I haven't had enough time to find the best formula but works good for half and hour or hour in veg up to 2 or 3 hrs, and start in flower the same and run maybe Lil longer at end of flower. As flower goes on slowly run more hours. But it's all strain dependant so start slow and add more hrs slow. Have to find out for yourself and the bulbs you get and the strains etc. You'll see a darker leaf usually. Don't let it get too dark or sunburnt or weird wilt and taco etc
No doubt. Highly interesting.
Could these UVB bulbs be used with HPS fixtures?
Awesome! Thank you for all the great information
Ive been wanting to try it on my cannabis grow for a long time
Como usar no grow o uv? Quantos minutos ?
Tenho uma lampada uv,E-27, de 20w e um grow de 60×60×160cm
do u have video abut light schelude 12/12 18/6 20/4 24/0 witch one is the best ? for autos and other plants ?
Auto = 18\6 all time
Others 18\6 vega 12\12 flowering
If uvb is filtered out by passing through glass how does it get out of the bulb? 🤨
Only uvb-c is filtered and thats the dangerous one.
did your migro uvb light bar work for control oidium and pests?
I’m looking at uv enhancement now and am kinda stuck between your uvb310 and rapid leds uva light. In your honestly opinion which Uv responds the best in cannabis?
Great info. Keep up the awesome work!
How much is the 4by4 and what Watts does it pull from the wall mate 👍 have a good one mate
I’m curious if there is a time of the “day” that the use of the uvb would be most effective. 🤔
Only one way to find out
I would think during regular light hours. That's when plants get uvb in nature.
In the middle of the light cycle to stimulate noon when the sun is at its peak.
I love the last interview with Andrew where they have all the varieties of plants being tested and you can see a couple Cannabis plants thrown in purely for science as well. These plants arent being topped or trained for yield in anyway, purely for study. ^_^
Does uvb kill bugs? if not do you know which uv nm range kills bugs?
Hi,
No UVB does not kill bugs, it can be used as a preventative.
@@MIGROLIGHT is is just uvb that deters bugs? I have seen a video On UA-cam about spider mites being exposed to a uv light and it killed them the longer they was exposed to the uv , it could of been A far uv or uvc I can’t remember and for the life of me I cannot find the video it’s worded something like effects of uv on spider mites in lab under microscope
Awesome video