I love how your channel is dry, straight-to-the-point scientific, and 100% cringe-free. No trashy trap music and getting all stoned, forgetting what you're talking about mid-sentence. We need more people who treat the craft with the respect it deserves. Well done!
@@DeBaccoUniversity why do my plants start looking like garbage over 15 DLI? Temp, 76, humidity 60, feed adequate. They start dropping within 24 hours of going over 15 DLI
Another good video from Prof Debacco, Glad to see you using data from Dr Bruce Bugbee his work is good. he has done so much in his field of Plant physiology.
Goal is to provide a collection of researchers to help growers better understand the data that is out there so they can best apply it to their individual situations.
Thanks for this, and those who have watch the videos have reported improvements to their growing which is great to know! Be sure to share the channel with others!
So it’s 3:13am and I’ve been watching your videos for HOURS! Lol. I’ve watched quite a few from Dr. BB and Shane from MIGRO so I have a basic understanding of what you’re talking about and the terms you’re using, but for the first time I think I might actually understand what I need to do to calculate my own. Of course it’s not happening at 3 in the morning haha but I’m actually kind of excited to sit down and do math tomorrow! I never thought I’d say that in my life. I’m very keen on optimizing (and really learning in a hands on way about) my indoor environment. My lights are made by Atreum, I think MIGRO was one of the few channels that reviewed them but there otherwise isn’t much information available online about them and nothing detailed. So I’ve got to figure it out myself. This video series here will be so helpful as I sit down with a pen and paper and figure out one number at a time and do the equations. I know the result will be better photosynthesis and faster growth which is why it will be worth all the effort :) math was never my strong subject.
Great quote... "for the first time I think I might actually understand what I need to do" This is the goal of the channel, quality and usable education!
Hey you can just google a DLI calculator online, photon has one and a par meter app as well which helps. 800 par for 12hr is 34 DLI and 1000 is 43, 500 par for 18 hours is 32, 600 is 38...
Hello, I just want to let you know that Shane is actually founder of MIGRO, with a G, not a C. I didnt know if you were aware or it was just an accident. Either way just want to leave a friendly comment letting you know. Cheers.
They actually go hand in hand when you get into vpd/ppfd/dli you can get really measured in your approach to growing which helps in setting markers which can be used to test hypothesis against control groups. It can be as simple as defoliating one plant and not the others, to getting into charts and pinning yarn between them hypothesizing which variable attributed to the growth you tracked.
Amazing and compact information in one single video. So valuable, thank you so much! Now I'm more secure about making decisions when it comes to light choosing and how to manage the saturation of CO2. Cheers!
Great to know, thanks for commenting! There are hours of research to ensure the content is delivered quickly and to the point without getting people lost and not shorting information. This balance is a challenge so it is always notice to know when others (like yourself) take the time to comment and confirm this original plan for the videos on this channel.
Where are those light measurements taken, the very top ,the middle or the bottom of the plant? I never hear anyone put emphasis on where to take the light reading. I have plants that are short and bushy and taking the reading at the very top makes sense because of how uniform everything is especially after lollipopping while I have a couple of strains that the tops have really stretched and there is a much greater distance from the tops and the rest of the plant giving a much bigger light variation from top to bottom.
Great video. Enjoyed the format and straight to the point(s). Easy to follow! I've watched a lot of your other videos as well. Quick question: do you recall the co2 saturation (ppm) uaed in the exoeriments?
Hi Prof. Debacco, recently found you and i am very much enjoying your content! Keep up the excellent work i'll be recommending your channel to friends :)
Was an optimal CO2 level mentioned in correlation to potential ppfd levels. I'm getting into 11-1300ppfd range and figured it was a good time to fully depress the accelerator as far as CO2 goes. I set it to 1300ppm. Is 1500ppm still considered highest optimal CO2 level?
Typical CO2 target level is 1200ppm as this is the main economic threshold. 1500ppm is still considered to be the maximum value (assuming no other factors are limiting) if return on investment is not the main focus.
If outgrown plant can manage a DLI of 60 outside with natural co2, why it would not be able indoor and oblige us to not exceed 900umol ? To reach 60 you need to 1389umol PPFD on a 12/12 cycle. Is there less co2 in an indoor cultivation than outdoor ? Thanks! Very useful!
The first picture is also the answer to the question of whether you should plant an outdoor plant in a spot that has before noon or afternoon sun if these are your only options. The answer is afternoon sun
7:29 the "optimal DLI level 65" is that with co2? i always heard 40 is "max you can go" but im foing autoflowers and interested in learning if i can push it for more hours lights on and if its benigicial, hurting the plants or its just a waste of electricity. (ex if I run 1000par for 24 hours it's DLI 86 )
Hey Professor ! Im a confused : on the "crop stage" chart max DLI is 45 , then on "DLI" chart you say 65 max while the values stop before 60. So what is max DLI for veg and flower with and w/o CO2 ? Also dropping DLI by 40% when switching from veg to flower seems counter-intuitive, it is not like that in nature; At that point plants grow fast, that is the beginning of the so called stretch period, so reducing light is strange. Do you have more info and sources on handling DLI when switching ? Thank a lot for your work !
@@DeBaccoUniversity I do thanks for your work. At the market are affordable sensors for measuring dli? I have seen trolmaster agro have a par sensor suitable for greenhouses with supplemental light to achieve the par needs of the crop but this dli data gives you play on veg phase. In flower state you are limited to 12/12 cicle, you can play with 13/11
This is independent of plant type as it pertains to light intensity and duration per day. Calculate this and then relate it to all plants growing in this area.
@@DeBaccoUniversity Thank you for responding! Sorry, I should have mentioned that I was referring specifically to the "DLI to cannabis yield" curve-- is that the same for all plants, or specifically cannabis? Would tobacco have a different curve? Am curious because am a newbie hobby tobacco grower for historical curiosity, not profit or anything. I'm getting the impression that most plants, as seedlings, have less stringent requirements than tobacco and cannabis, in that the latter require high color temperature and DLI compared to, say, tomatoes. But I think cannabis has completely different light requirements as an adult than tobacco? That is, tobacco can be grown outdoors in such relatively low light areas as Pennsylvania and West Virginia, whereas cannabis would never be productive outdoors in those environments? Or maybe I'm totally wrong.
So DLI should drop when flipping to flower? I thought DLI should be kept the same or even increased when flipping to 12/12? I'm so confused >< I read every comment and you answered one who asked but the time stamps you gave didn't explain it :( could you please clarify if DLI should be decreased/kept the same or increased when flipping to 12/12? Thank you!!!
Goal would be not to drop DLI, but it gets harder to achieve due to the reduced duration. this is why the highest PAR is used during flowers to help keep the DLI as high as possible.
@@DeBaccoUniversity Thanks so much for your reply! Glad you said that. Those charts that say to drop DLI at flip are really confusing. thanks again and love the videos!
Great information! Thanks so much for sharing 🙏🏻 One question tho, is the rate of photosynthesis dependent upon temps under co2 enrichment. If so what temps are optimum? Thanks again 🙏🏻
Thanks for another great video! I have a question, if my 5 x 5 grow tent is in a much larger lung room and I'm pumping that rooms normoxic air 24/7 doesn't that replenish the CO2 to keep it a a natural level if the tent isn't overloaded with plants?
I finally made it to this level of realising about this factor using 12-1 and uncommon flower light tapering. Mostly no information about the level curve and why use high levels and when. Luckily using a 12-1 like I was pushing the veg, and then cutting down to 10 hr days, seemed to unknowingly do the trick for me, vs maintaining the same DLI from veg to par as 18-6 and 12-12 growers typically do. My guess is maintaining a better par into flower and tapering off for the intended last week or two would keep speed above natures curve but allow all the resins and oils to maintain . My question with shorter flowering days is can you raise the ppfd to 1250 for an 8 hour day without co2, vs 8-1000 ppfd for a 12 hour day?
My light manufacturer suggest to keep the light at 24" between the canopy. But i see videos with lights that are hung 5' up? I'm confused. The par reading would be at 10?
Great video thanks. Interesting the recommendation of up to 45 DLI in veg WITHOUT CO2. I've gotten light stress/burnt tips etc. at a DLI of about 30 in veg running 18/6... Is the recommended 45 DLI dependent on all other factors being spot on i.e. VPD, nutrition etc? In other words, how can we push to 45 DLI if plants are stressed at 30?
You likely have a few factors out of range for growing at 45 DLI. It could be the ph is a little off (should be 6-7ph), improper nutrient levels, watering cycle, medium, environment etc. All those things need to be fairly spot on for optimal growth. Trial and error are the only way you'll get it right. Take notes, write down what you do and when so you can keep track of results.
Can I start giving my plants that just sprouted 60 DLI (~925 PPFD at 18/6 cycle)? or should I wait some time before giving 60 DLI to small plants? thanks
when you talk about enriching with C02, how much ppm are you talking about? I have one of those “Exhale” bags of fungus that is supposed to give off C02, but i’m not really sure if it is a significant amount for me to increase my light intensity.
Search the channel for "Carbon dioxide" and you will find many videos on the topic, but here is one to get you started.... ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-0zEBlCXCFL0.html
Really nice videos! Very informative and most importantly, scientific! I'm trying to get past the 1000ppfd.. LED lighting, temp and humidity are in range, Co2 @ 1500, but I never seem to be able to go over 1000ppdf. Even in veg, have to go at 400-450PAR and at the end of the 18hours, leaves are dropping like they have enough for the day. I'm puzzled! If you have any clue, that would be awesome! Thank you again!!
My plants seem too have had anuf light at around 14 hrs they start too droop a little more in the new growth everything is in check im only at 450 ppfd
Isn't that DLI a bit oversimplificating the topic? I mean, at some point there must be too much light and on the other hand e.g. 1 sec. to 60min on/off periods would surely affect the plant different than several hours and so on.
Yes, there is a maximum intensity, but what growers need to take into consideration is when reducing the hours of light to still try and keep the DLI similar.
Awesome data! I have a question if i may ask. I posted a video just a few minutes ago asking this question but i will ask here to see if you can shed some light : ) on my inquiry. I have a full spectrum led light. i have both the veg an bloom on 100%. I used an app called Photone and it shows my light temperature is 12,000k. I understand there is a difference between the color spectrum and the color temperature. For a seedling or a plant in Veg, is there any harm to come from running at 12,000k?
You also have to take PAR into consideration. 12,000K seems to be a bit outside of the normal color temperature so it will be interesting to see your results.
@@DeBaccoUniversity Par/PPFD is around 240 and DLI is around 14.5. I think I'm within range for a seedling. So far its growing very short. Very little distance between nodes. 3rd set of true leaves are forming. Its vibrant green. No obvious deficiencies. Everything seems great as far as I can tell. I might keep the lights on full spectrum the entire grow since I know the blue and red are both on full power. Interesting to see how it goes.
Good question.... as it does have an impact on photosynthesis... www.researchgate.net/publication/261607138_Impact_of_Increasing_Ultraviolet-B_UV-B_Radiation_on_Photosynthetic_Processes
Ive got a lumatek zeus pro 600w led ( known as the photontek x 600w pro in the us and canada ) It gives out a PPF of 1620 µmol/s at full power. It comes with dimmable adapter and was wondering what sort of output i should be looking for at different stages of growth. I don’t see the point in amping up my electric bill by having the lights at full 600w power throughout seedling and veg stage if it doesn’t need it. What would you recommend through different stages of the grow. It has 25%, 50%, 75% and 100% adjustments. Any feedback would be much appreciated 👍🏼
More research will be needed as to the overall use/impact on the plant, but the early research is in support of the expansion of the Ps wavelength range inclusion... www.frontiersin.org/articles/10.3389/fpls.2021.693445/full
For 10 hours of a day can I increase the ppfd? - cheaper electricity. How much should I increase it, for what DLI? I'm thinking to give it 1200 ppfd in the center for 10/14 without CO2.
DLI of 65 moles per day is considered to be the threshold for optimum growth and photosynthesis. You may have to perform two separate calculations an intense light cycle and a normal light intensity duration to best match your growing situation.
@@DeBaccoUniversity as I understand 65 is possible in a 24/0, but for a 10 hours a day I should aim at max at 40 what is equal of 1200 ppfd per 10 h +-.
very rare but very important information. I`m trying to automate dimming of my Quantum Boards + UV + Far Red. Far Red must rise in the morning from 0 to 50% and then the main light starts from 0%. Both they accelerates to 75% and here UV starts rising. All lights get up to max. At the evening all the lights are dimming in reverse order. How do you think, is this plan correct? Have you ever wondered how the spectrum of sunlight changes during the day? Its veri interesting. Thank you. Upd. Just found your video about Spectrum Comparisons)))
The sunrise/sunset dimming has not been shown to offer much of a benefit so on and off is fine for the plants. While the actual spectrum may shift, there is an ideal for the plant so the goal is to provide this ideal in the greatest duration to help maximize yield. You do not need to get into small details.
PPFD in µmol/(m2sec) ; so if you multiply m2sec you should display the formula as: µmol/(m2*sec) and not µmol/(m2/sec). You don't divide by sec you multiply. Also it should be said as µmol/m2sec and not per sec. Or even better µmol/(m^2·sec) in Excel.
The PPFD unit is measured in micromoles (one micromole equals 62 quadrillion photons) per square meter per second (µmol/m2/s). This means PPFD is the amount of PPF that arrives on each square meter of your crop at any given second. www.monnit.com/support/knowledgebase/sensors/what-are-ppfd-and-ppf-measurements/
Not a very useful video. Very dry and technical unless you just love hearing random numbers spoken. You could leave out the math examples. I had math in grade school and understand simple multiplication and division just fine thanks. All this info is available in easier to follow packages
So how do you get that 60+DLI without waisting energy or using co2 my plants are in flower on a 12/12 schedule at 900 par and my DLI is 38.88 will I be ok
You need more PAR, but need to adjust other conditions. Based on your description your plants should do well, but may not reach their maximum potential.