"Magical" LEDs let my plants grow faster? (Experiment) The Future of Farming!

Do you want to know more about the Würth Elektronik components? Then click here: www.we-online.com/katalog/en
Würth Elektronik products, which were used in the video:
- WL-SMDC Horticulture LEDs (150353xx74500): bit.ly/WE_horticulture_leds_en
- Lighting Development Kit (150001): bit.ly/WE_Lighting_Dev_Kit_en
- MagI³C-LDHM LED Step Down High Current Module: bit.ly/MagI³C_LDHM_LED_Module_en
Würth Elektronik REDEXPERT Software: bit.ly/REDEXPERT_Horti_Leds
Landingpage REDEXPERT for more information: bit.ly/REDEXPERT_LP_en
Websites which were shown in the video (application notes):
bit.ly/Let_it_grow_LP_en
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In this project we will be having a look at horticulture LEDs aka growing LEDs. I will explain why they can improve the growth of plants and then show you a practical example in which I built a high power LED board long with a driver circuit for it. At the end I will then use all the electronics in order to conduct an experiment in which I let arugula grow for 3 weeks with and without the growing lights. Let' see the results!
Thanks to the Würth Elektronik eiSos Group for supporting this video.
0:00 Horticulture LED introduction
0:57 Intro
1:10 How can Horticulture LEDs help plants?
3:38 DIY LED board
6:07 DIY LED Driver board
7:44 Final Experiment setup
9:41 Experiment execution & result
10:25 Verdict

[@greatscottlab]

German version will come out on the 23.02.2022. Additional Notes: I used the heatsink for the LED board the wrong way around since it was easier to mount it that way. And also make sure to position the capacitors as close as possible to the constant current drivers. Mine were a bit far away. Check out the datasheet for all the juicy details ;-)

[@RocRizzo]

Maybe they will release it to the Netherlands as well on that day

[@james-barnett]

How is this comment 7 days old, but then the video came out today?

[@niewazneniewazne1890]

It is winter so there's not a whole lot of sunlight, but overall the amount of sunlight that gets into the house is much lower than one under a shade of even a tree. The overall light level of regular(non-grown) lights is also less than a large tree shade in summer. Correct me if I am wrong, I seen a video on it long time ago, and haven't tried repeating the experiment in anyway. Would it be possible for you to repeat the experiment with a control group with a plant growing outside (in summer)? It's an interesting experiment nonetheless, I usually have seen them used in tents that reflect and trap the heat of the LEDs[sometimes a different technology], with no outside light source being injected into them, like large panels with "100Ws worth of LEDs".

[@herosstratos]

@@RocRizzo Uiteraard, LED-groeilichten (en assimilatieverlichting en stuurverlichting) zijn erg belangrijk in de glastuinbouw.

[@TimoOnline]

Wird die deutsche Version auf demselben Kanal sein?

[@roehle9962]

Cant fool us Scott. You’re definitely preparing for the legalization 😂

[@luxxxa1186]

😅😅😅

[@NickyNiclas]

That was my thought as well! 😅🍃💨

[@Tomazack]

I wanna see what he can do with some Bridgelux Gen 7 Vero 29 Array cobs when the time comes for being a self-sustained ganja gartner in Germany.

[@greatscottlab]

Keep it a secret ;-)

[@TheSkubna]

Just remember, use Alaska fish fertilizer during all greeny growth. Get you some big... Berries...

[@pablogarin]

Pointers for those who want to use the lights - Encase the whole plants in a closed box, and line the inside with some kind of reflective material. Kitchen foil will work fine. This will help to maximize the use of light, since you won't have runnaway light. - If you do this, remember to add a ventilation system, and an air reflow system, IE: a fan and an air extractor and intake. - To make your crop have a higher yield, put near you planrs a bottle with water, yeast and sugar. The yeast goes through a metabolic process (fermentation), releasing CO2. The higher the CO2 concentration near the plants, the bigger they'll be. - If you don't have money or access to LEDs, you can use other light sources, like a high pressure sodium-vapor and mercury-vapor lamps, which gives you the required light spectrum to grow the plants. A bit of warning on the subject, you'll have to watch out for heat, and those lamps need a ballast to turn on, which can be a electrocution hazzard if not placed correctly. - Buy a humidifier for babies on Walmart (or any retail store). They're relatively cheap and can help out a lot if you have a lot of fans, cause moving air tends to dry off surfaces, and the leaves can get damaged. Place the humidifier near the plants. - If you can spare the money, buy a reverse osmosis filter, and use filtered water on your plants. Put humus soil and red guano on the earth for the nutrients. Remember a plant will always need Nitrogen, phosforus and potasium (N-P-K), alongside a lot of micronutrients, like calcium, magnesium, etc. Feed you plants, don't just water them. - Your soil should always have drainage. If you can find perlite to mix with your soil, that's great. If not, add sand and little stone pebbles. Plant roots also breath air, so if they're submerged, your plant WILL drown. - If you don't have a lot of room for your plants inside of your box, you can put a net a couple of inches above the soil, and when your branches reach the net, route them to the sides to allow other branches bellow it to get more light. This is called "training you plant". There are a lot of training methods, and it depends on what you're growing. Lettuces, and herbs in general don't need training. Fruit plants generally will benefit from this. - Plants need the night time. If you leave your lights on, you won't be helping your plants at all, and you'll probably cause them unnecessary stress, which can reduce yield.

[@malcogc]

Eres un genio bro, seguro q plantas marihuana xd buen resumen

[@mediverse]

Thank you, extraordinary

[@xtudogrow]

We use old PC Cases to make our secret-greenhouse inside. You gave really nice tips! Thank you!

[@dominic.h.3363]

The part at 3:13 holds a crucial information that is dismissed by a lot of people who claim to be experts. This video is more accurate in its simplicity than anything I've ever seen that takes itself so seriously, it even dredges up quantum physics.

[@greatscottlab]

Thank for the feedback :-)

[@sayyidsahal4533]

True

[@FOATE]

Definately true! I believe that graph is called the McCree curve, that dip in the middle far more exaggerated then it is in reality. That study was done in the 70s, but it is impressive nonetheless considering what equipment they were working with at the time. But experiments repeating this research show a far less exaggerated dip in the green range. Photosynthesis DOES in fact happen with green light, that's been proven now, just not as much as with red or blue light. I've been researching this topic out of personal interest for a while and I found out a couple of really interesting things. Green light supposedly penetrates the leaves so the lower leaves receive more green light, as the higher ones absorb red and blue first. Thats why the lowest or deepest leaves die off, as light levels decrease, but it takes a few layers before that happens. Also, red LEDs have been researched and developed the most specifically for horticulture, as red seems to have the biggest benefit to plant growth. In fact daylight LEDs, 5000k for example can approach or sometimes even exceed the efficiency (umol/w) of special horticultural blue LEDs, but a warmer 3000k LED usually wont beat a horticulture red LED. Finally, to squeeze the most performance out of your LEDs you can underdrive them. I've got some COBs that are usually driven at 120 watts a piece but I drive them at 50 and just use more LEDs to get to the total desired output. These are just 3500K LEDs not really anything special, but this way the efficiency goes over 2.5 umol/w wich is actually about the same or sometimes even better then some commercially available LED assimilation lights.

[@dominic.h.3363]

@@FOATE The McCree curve itself is an average of photosynthetic response measured through a very tiny sample of plants, so it can't be taken for granted either. I use my LED lights at 40%, really helps longevity.

[@Sovvyy]

Something interesting I found while reading studies a few years back, is that plants have different absorption and saturation points for each wavelength. It seemed that a broad spectrum of light can help light reach *lower down leaves by penetrating a plants canopy, but also increase the total amount of energy absorbed by the plant. It seemed generally species-dependent, however, I think it makes sense considering the Sun's spectrum.

[@laernulienlaernulienlaernu8953]

And he did the experiment in winter, I'd like to see the same test in the summer.

[@JLCPCB]

Great video Scott! 🙂 We're glad to see that you used our newly avaliable Aluminium PCB's 🥰

[@3d-lab163]

Best PCB producer 🙌

[@heibai7034]

As an amateur aquarist, I very much appreciate the knowledge of light preference of plants. I thought it was just a myth that red/ blue lights make aquatic plants healthier. Of course, I should've known if I had done the slightest bit of research but, the socioeconomic situation I'm in discourages me from indulging in something as luxurious as a complete biotope indoors- That is to say: "I'm broke lol". At least I live near the equator where the sun shines 7 days a week, 365 days a year, and rarely gets colder than 25 C so, my pond is fine.

[@dominic.h.3363]

Get yourself full spectrum LED strips that have spectrum curve data available, and get the strip that most closely imitates the Mcree curve. 120 LED/meter density would be preferred. Use four strips the length of your aquarium, and use a cheap 3 button controller to use them at 50-70% for 6-8 hours a day (be careful here, if the controller is too small for your total LED strip length, it'll just burn out). If you follow these instructions well, your plants will grow well, and you will not have spent more than maybe $40 per meter of aquarium length.

[@IanSlothieRolfe]

The purple light also makes the fish's colours more vibrant - thats largely why aquarium shops often use purple lights in the tanks. It can cause algae to grow more too, so you might need to deal with that.

[@dominic.h.3363]

@@IanSlothieRolfe Generally speaking, any excess in the blue part of the spectrum will cause excess algae growth, even if the light is appearing to be white. The output needs to be balanced, because - in very simple terms - too much of one wavelength can impede the plant's ability to photosynthesize in other wavelengths. And that impaired function in overall plant metabolism is where algae comes in. Algae are photosynthetic organisms that are generally much less fussy about what they use to grow, so anything in terms of nutrients you provide your plants that makes them grow but they are unable to utilize (in our example by impeding their metabolism through unbalanced lighting) will be used by opportunistic algae to grow.

[@KM-rx7hz]

regular led bulbs work just fine, just are less efficient than horticultural led like the samsung lm301b . if you have limited budget watch this migro channel test some phillips bulbs kzbin.info/www/bejne/jp-sq3WVbdChgrc

[@dominic.h.3363]

@@KM-rx7hz Commercial products that aren't meant to grow plants - like "regular led bulbs" - are always a hit or miss. You can't just state something generally then show proof as if it were an example among many, instead of what it truly is, a lucky find. I've had 5500 lumen 30W 6500K LED reflectors not grow Monte Carlo, a rather easy carpeting plant, because none of these three measurements mean a damn thing for plant growth.

[@Geniusinventor]

Can we all take a moment to appreciate the work this man is doing to entertain us. Man, thank you! Keep up the good work.

[@greatscottlab]

You are welcome :-)

[@Geniusinventor]

@@greatscottlab ;-)

[@Kawka1122]

@@greatscottlab He bought parts from Wurst Elektronik !

[@FinlayDaG33k]

Me during the last few days at home: "I wonder if those LED lamps for plants really work..." GreatScott: "SAY NO MORE"

[@ShahZahid]

well guess i was right about guessing the video of this week, awesome video

[@greatscottlab]

Thanks :-)

[@Lil_Puppy]

I bought a full spectrum led grow light for my indoor strawberries and the plants are about 4 times the size of the ones that are outside. The leaves are absolutely monstrous and I'm hoping they'll produce nice big strawberries when the time comes.

[@boesesascha]

I'm trying to grow lettuce in my new hydroponic system since the end of January here in Schleswig-Holstein so you released this video at the right time for me. Thanks.

[@JonathanDeWitt1988]

I love seeing your experiments with automating or enhancing plant growth. This was a very neat project. I'd be curious about power consumption for an indoor greenhouse. But of course that all depends on the size. Thanks for giving us this glimpse into enhancing plant growth with LEDs.

[@AliYassinToma]

This is the first time i open a comment section to find that almost every comment is at least 5 lines... Great video informative and simple 👍

[@AndrewWorkshop]

I used a common daylight LED bulb to grow pepper plants in the winter. I wonder how they perform compared to the horticulture specific bulbs? That would be a good video.

[@Supergecko8]

@Lassi Kinnunen (WILL CHANGE ACCOUNT IN 2 DAYS) lmao

[@MrGoatflakes]

Lightbulbs that are made for humans aren't a good fit for plants. They are most reflective in the light our eyes are most sensitive it, meaning you're wasting electricity as they can't absorb the green and yellow.

[@amuricanmayo]

@@MrGoatflakes this is not true, new research states that the entire spectrum is useful in plant growth.

[@amuricanmayo]

daylight bulbs are the recomendation for larger plants although the blurple lights are more efficient for small plants ( most of the blurple light is absorbed in the first layer of the canopy while the green light from daylight makes it farther down)

[@MrGoatflakes]

@@amuricanmayo perhaps but it's not very efficient as most of it isn't absorbed.

[@straight-outta-jutta]

Your videos were always great since I started watching but I feel like in recent time the quality has gone up even more! Keep it up!

[@petergoestohollywood382]

If you are opting for the best spectrum characteristics with excellent efficacy during the vegetative phase of most plants you would want to use 3500K - 4000K white LEDs and 660nm monochrome red LEDs which due to their high efficiency boost your PPF/W. Adding some far red appears to be most beneficial during germination and flowering. PAR levels greater than 1000 at any given point should be avoided or your plants will get too hot. If you see tip burn, hang your fixture a little higher. Maybe you can get apogee to sponsor you with one of their quantum Sensors. That could be fun ☺️ I used LM301b chips and osram oslon ssl or square for my fixtures. Mean Well builds excellent current sources. I couldn’t measure it exactly yet, but my fixture should produce 2,8 to 3,0 umol / Joule.

[@justinsenryu7308]

Does that advice about 660nm red LEDs apply also to growing things like rice and soy beans? I am hoping to make them flower sooner and thinking if I should add red to my setup with bright LED shop lights. Also is it possible to buy strip of such LEDs, either ones I can just plug in with no DIY or otherwise DIY ones but as strips? That would seem easier than having to solder them to boards etc. but I cannot find such products so far. Thanks!

[@oddjobbob8742]

Great Scott! Your personal presentation in your KZbins have really improved!

[@decem_unosquattro9538]

Everytime I see your intro I think its much better and a lot less annoying.😃😄

[@der_pinguin44]

This journey with you through the years has been phänomenal.

[@KangJangkrik]

Mr. Scott is like my daddy, loves electronics and programming as a youth, but now prefer taking care his garden

[@c3ramics]

Thank you so much, glad I found this as a couple years ago I was looking for a number of tutorials on arduino horticultural LED for research. You hit the mark on engineering principles and an amazing tutorial!

[@embracethesuck1041]

What great timing. I've been struggling with some of these choices to make aquarium lighting.

[@cedricsilvinoz]

I was actually looking for someone to make a proper led light diy for years. Thank you.

[@zerodegrekelvin2]

Uber video! I live in Canada so yes the sun light is an issue during winter time, very good analysis you did with wavelength absorption. Definitively good project!

[@WorkWithoutHuman]

Didn't watch it all but I got your point from the title, and parts I watched. Previous tests been with halogen lamps, but leds are next level (smaller, less material, more in number). Of course notes and drawings in pyramids sent written note about light frequencies influencing mutations from fungi to green plants (and algae - but differently). Progress after 15,000-40,000 years. We used mathematical/geometric forms and combinations between them on the other planets and after arriving here, for less expendable materials, and reusable. I had small farm when I was with deficit of specific foods (were not available online or friends I knew), I had my sources mutated and replicated into plants I wanted with math forms, which have identical speed of growth as you apply maximum use of all leds around (with the specific frequencies). The advantages were, I could change the geometric form in seconds in some days to achieve same result as changing other frequencies in different range (which would require factory for other leds or lamps with additional factories for electricity). With geometrical forms you can easier change the form of the plant, length, size, etc. I didn't throw bomb. I melted the ship we came (with geo forms).

[@DavidD03820]

Great video and everything was accessed so easily. I remember 15yrs ago i was really into this as well. messing with LED's Red/deep red, blue, white 1w LED's at the optimal wave lengths with special focusing lenses. I had to construct my own Drivers for each string of high powered LED's and hookup an Arduino mini and learn programming with a real time clock and dim up/down slowly depending on wake up and sleep times. I had to do a lot of tinkering on my own and learn about different configurations of LED's depending on the cycle the plant was in. I learned to solder, build circuits, about plants, nutrition and a bit of engineering. You really took me back to those old days of learning and wonder. Thanks! great video!

[@IbbiAhmed]

15yrs ago? Damn! You were way ahead of time

[@DavidD03820]

@@IbbiAhmed thanks, yeah that was when the 1w led lamps where just being made and sold on ebay ONLY available from china. Thanks, I'd like to think so, haha. Yeah those were different times indeed.

[@mimimi9170]

Duygulandım. You also remind me my old good days

[@tinkmarshino]

I was thinking of giving some space in my little lab area to do just this very thing. I have a nice little 4'x3' (121.92 cm x 91.44cm) area to do some early growing for my garden this year.. so I appreciate this bit of information.. Carry on!

[@agoffgrid640]

Iv had mixed results in the past but I love how obvious your results where. Thank you for this video. Now I'm going to get our greenhouse refitted for leds

[@greatscottlab]

Lovely ;-)

[@WyllCavalcante]

Keep it going man! One of my favorites video posts on sundays!

[@BushCampingTools]

Great video as always. i would like to add the actual "day length" or "photoperiod"plays a big role too, ie te amount of time the plants are irradiated at plus the actual intensity at the surface of the leaves.

[@qutlicopatlixhotutti6552]

Thanks again for the nice Video! I would love to see more projects about the greenhouse. Your videos make my Sunday better every time.

[@greatscottlab]

So nice of you

[@TheKnurdLab]

The info that plants respond to different wavelengths of the EM spectrum differently is curious and new to me. Thank you for an excellent presentation. I request you to make a video if possible on these EEG sensors and translating the electric signals from muscle to mechanical actuations.

[@andymouse]

I've been using my own LED grow light for my Tom's for many seasons now and the results are like yours, excellent and I to used an Arduino to control them, its great advice if like to grow fresh food...cheers.

[@EarlWallaceNYC]

Well Timed video. While it's still cold, I'm starting out-side garden indoors under artificial lighting. Thanks for the details

[@MichaelWeidauer]

That Kot might be really cool for educational purposes. Thanks for that!

[@1123pawel]

It is worth looking into the effects of different light spectra on plant growth.

[@truthinck8853]

Absolutely genius!! Deserves a honorary award

[@ProlificInvention]

If you'd like to heat your greenhouse in the winter months then I'd highly recommend a Chinese diesel heater. If you're not familiar with them then do a Google search using that term, they are awesome little heaters that consume diesel fuel and some electricity but overall are very efficient, simple, and reliable. I own 5 and have thousands of hours of operation on them for various purposes including heating a greenhouse in the cold climate of Michigan, USA. I use LED and HPS growlights to supplement the sunlight, and the diesel heater at 27,000btus of output as well as taking advantage of the exhaust waste heat is more than sufficient to maintain the temperature even in the coldest blizzard conditions. I also use old fashioned style large bulb Christmas lights for supplemental area heat on tropical plants. Excellent video by the way!

[@Sarahbuildsstepsequencers]

Excellent experiment, Scott! 🌱 🪴

[@laernulienlaernulienlaernu8953]

I love how even though you've changed the style of the videos, for the better, you've still kept the "so..... let's get started" 👍 Edit: and the beautifully drawn diagrams!

[@ericwilner1403]

Interesting! It's just about time for me to be starting seeds in the basement. The cheap LED plant-light strips I bought last year did OK last time, and I'll leave them in place for this season, but since the garden is expanding I might want to expand and upgrade the starting rack... so this information could prove useful in preparing for next spring.

[@AbdurRahman-vt7vx]

Always great stuff from you Scott! love your videos

[@N1ghtR1der666]

There is some really cheap and simple diy light spectrometer projects around perhaps you should do one of those so that people can analyze there new horticultural LED spectrum to make sure its blended the way they want

[@uzidore]

I enjoyed watching this experiment, with more of these there could be arrays of LEDs controllable with a microcontroller like an esp32 and maybe a monitoring system for soil moisture and more. (:

[@NavySturmGewehr]

We've been starting our garden plants under a wide band LED array and my goodness it works well. However, the single best light I've used is a CMH. The original MasterColor RetroWhite HPS CMH was just amazing. Low heat output, amazing plant growth... UV A and B (plants actually seem to like this)... just don't let anything get within 30cm of the arc tube or they get wicked UV burn.

[@tyvaughnholness1985]

Awesome video, first time seeing aluminum PCBs in use, thanks!

[@DoctorX17]

Something worth noting is that some plants actually don't like the extra light, and need a rest period at night. But obviously your choice of test plant will take as much as it can get! One of the biggest benefits of this type of system is you can have a perfectly controlled environment, or grow in places with very little light, like an apartment with only one little window that you can't put your plants in or in a basement. I have an aeroponics lab in my basement and have been using something like this for a while :D lovely results

[@1kreature]

Yep, 24/7 light stresses plants. It can be tasted.

[@greatscottlab]

Yep. That is correct. There are tons of things to keep in mind. I couldn't cover everything in this video.

[@DoctorX17]

@@greatscottlab Fair. I would hope folks are looking into the needs of their particular plants anyway!

[@Novashadow115]

I have a little aeroponic unit in my bedroom for exactly the reason you described, only one little window in the bedroom. Its called the Aerogarden and honestly, i love it. I dont keep the plants in it for long though, i mainly use it as a starter until the plants get big enough to repot. My Thai Basil friggin exploded and since I did'nt bother pruning it, it's grown some lovely purple/pink flowers!!

[@DAREDEVIL-lj2we]

looking great my man and as always great project

[@camilo.9002]

Thanks, this video helped me alot to start with my own grow box and now having a grow house, now i earn 7grand a month . 🍃❤️🔥

[@trkcng27]

Thanks for your labor 👏🏻👏🏻

[@matikaevur6299]

No comments about electronics. But looks like rucola is as hardy weed as dandelion ;) When i bought my house, previous owner had 2 greenhouses. Not being green thumb myself, i dismantled bigger one and planted ordinary grass seeds where it was. 4 years later i still get nice rucola and thyme smell when mowing my yard ;) For some reasons those spices are first to pop out after snow melts. So between last snow and first lawn mowing - free spices :P

[@orlin369]

Great video! Please think about to grow up the project and add pump and soil moisture sensor to the plants.

[@19mitch54]

With the Arduino, you can simulate the timing and intensity of the sun on a summer day or maybe an entire growing season. I had an Arduino controlling a heater in my greenhouse. A light sensor detected sunrise. It had higher temperatures in the day ands lower temps at night. The University of Kentucky published a study of LEDs that showed that plants used red for growth and fruit and blue for respiration.

[@stuibeal]

It's always funny, I'm doing horticulture as job and be an electronics hobbyist, he's doing it vice-versa. Very nice! I'm experimenting with LEDs in plant production since some years, built me some with dark/red-blue ones (pink type). Best for basil. btw, maybe smaller pots would have done it too :)

[@STONEDay]

Awesome project! My grow light has 1192 high power leds. High can't imagine trying to solder them all.

[@Sjoerdverbraak]

Nice Video. little tip if you have high power LED's you can optimize your heat dissipation with a polygon (copper plane) around the led. Some leds have a special pin just to dissipate heat. (otherwise normally use the biggest pad of the led to make a bigger plane)

[@avejst]

Great review Thanks for sharing your experiences with all of us 🙂

[@BStreet666]

With such a difference over the period of only 21 days, this has fantastic potential.

[@serta5727]

What a cool greenhouse 🍀

[@tlange5091]

Great video! May I suggest a normal led test to see if it really the specific wavelengths or just additional light/ time.

[@AyraSikil]

I think, that using light sources with different wavelengths is essential in industrial scales, where as in amateur gardening an ordinary LED with a high CRI will work pretty much the same, except you do not have to deal with different led modules, supplying them with power and controlling them - just take a good LED strip, led driver - bam! It works just from the box - cheaper, much easier and almost the same efficiency

[@jeffw8057]

I love your content and presentation. Thanks so much! Regarding your LED plant growth experiment, I think it would have been a better presentation to isolate the LED plants to only the LED light using a dark room or similar arrangement.

[@Delali]

This is incredibly beautiful.

[@thingmaker3]

It would be interesting to compare these LEDs with the more pedestrian plant lights in terms of cost, effort, and effectiveness. Sigh. So many potential experiments and so little time. Thank you for YET ANOTHER EXCELLENT VIDEO!

[@melplishka5978]

This is amazing dude. It’s crazy everytime I need help with a project you come out with exactly what I need lol. I grow canibis too make.Cbd oil. I have have all the grow lites but the board it came with actually not too good. I tried too build one but just couldn’t get the signal right. Your explanation on the wave lengths and normal power modes helped a lot ty.

[@casemodder89]

NSA likes to know your location !

[@melplishka5978]

@@casemodder89 canada bro. Lol.

[@melplishka5978]

It’s legal here with license.

[@chrisv.6951]

His humor is unmatched ! 🤣

[@greatscottlab]

;-)

[@robelengida6211]

You were as great as always. Keep it up

[@UpLateGeek]

What a coincidence, I've been designing a multi-channel PWM LED driver and PWM fan driver too. Although for some stupid reason I got it in my head that I didn't want to use a microcontroller, and do it the "traditional" way. Which is probably why I've spent a week filling up two pages of my notebook with cakeulations and I'm still designing it. It's for a different application though, not horticulture. And it's for a much higher density of LEDs, hence the PWM fan driver.

[@mounirchabane5063]

Very interesting video and experiment, I like your channel, there is always something new

[@lubosmoravec8244]

Thanks for the great video. I've tried to get a quote for LED kit from Wurth, but 340eur + shipping is really high price for me.

[@stevetobias4890]

I have tomatoes and strawberries that get natural sunlight in the morning but loose it around noon. I set up a variety of 12v cob grow lights from 2pm to 7pm and the growth is great. Tomatoes are very tall with good fruit and the strawberries are delicious.

[@ar0n375]

I realy enjoyed the camera work in this vid :)

[@PhG1961]

Amazing result !

[@knoopx]

great video as always!

[@blomproductions]

Hey we have made a intire hydroponic system here in Trosa, Sweden where we use leds to make the crops grow inside its a very cool consept and we have took that to a smart system where you can control everything thrught the custom made app and in house build control board

[@speedsterh]

Thank you for a practical and interesting video !

[@timmgiles]

Met the chap from Wurth who invented these LEDs. Amazing guy, brain the size of a planet. He dropped me a selection a few years back and I have a small planter using them as well.

[@maneeshs3876]

Nice video and thanks for sharing, probably a new video could be done with a Raspberry Pico as well.

[@Mexzot]

My daughter did an expiriment for a science fair on growth patterns with different light cycling patterns. Cycled on 5 min / 60min / 6hr and 12hr cycles. We worked out that it was significantly cheaper to buy non agricultural LEDs and use a few more...worked fine!

[@mdnavid959]

Love the way you explain

[@lucasdiniz5642]

Very interesting, these leds will make my "plants" grow much faster in my indoor greenhouse.

[@DrHouse-zs9eb]

incredible results!

[@ErCanEverything]

I tried this and it really works🙌🙂

[@ElectronicLab.]

great video man!!!👍

[@MrKamelio2000]

great work that 's me thinking of light diffraction using natural material as prism combined with kinda tech

[@maxbas2018]

nice timing. Have to hold a presentation about Vertical Farming on wednesday in school

[@greatscottlab]

Funny coincidence ;-)

[@alexrossouw7702]

Regarding the use of green light by plants: Plants LOVE green light, they love it all. It's a myth that "plants don't use green light". In-fact it is the only spectrum that penetrates deep into a green leaf, where other pigments can use it, and where most of the photosynthesis takes place in C3 plants. You see, the blues and reds are mainly absorbed at the leaf's surface. If you think about it; all the chlorophyll surrounding the inner leaf is like a green light filter, only green light can efficiently shine through it, and red/blue light can't shine very well past a green filter, it is absorbed instead. Reds and blues are probably wasted before they penetrate right into the hungry mesophyll zone. Most of us in the indoor growing world use daylight spectra (3000K-5000K, 80+ CRI) that come with adequate green wavelengths, some people add extra reds. And that's it, well unless you into morphology experiments.

[@volvo09]

I saw a test where someone grew lettuce with a green LED (just a home store novelty bulb I believe, not a special wavelength). And it grew. Not perfect, but it grew, and grew a lot of mass. I've also seen where some lettuce grows deformed under purely red/blue light, it just keeps reaching for the sky rather than fanning out broad leaves.

[@alexrossouw7702]

@@volvo09 Believable, sounds about right

[@TechUpBuilds]

Great Video, Would be cool to see some other plants!

[@Damianos980]

I use purple T8 fluorescent lamp in aquarium with 6000k led modules. Plants grow very good.

[@MiH1IT]

I'm missing a comparison with only "daylight" LEDs, it would be nice to test

[@GrowingAnswers]

You can find that stuff with videos I’ve done.

[@giuseppebonatici7169]

yep, and the answer is daylight LED work better. the tired myth of "plant dont use green light" is still pervasive even against theorical and empirical evidence showing that all plants use green light (but some more than others, lettuce is the one with less requirements of green light.... but still grows faster with green light than the "optimized" LED at same Wattage) The heating effect of the LED should also be considered as there is a thermal lower limit where plant will grow. The (hyper exponsored) "experiment" has too many non controlled variables to be of any use.

[@NickyNiclas]

@@giuseppebonatici7169 but even the daylight and 3500K(warm white) LEDs have a substantial dip in the green part of the spectrum. The green part of the spectrum is just really inefficient in LEDs.

[@giuseppebonatici7169]

@@NickyNiclas that makes sense. In my experience daylight leds are worse than real shaded daylight (the daylight leds only created about 2500 lumens (luxes? I don remember)). I tried my best to match the leds and the shaded sun with about the same lux in both places. The sun won. but I plant trees that use like 80% of the green light (really dark leaves), so it easy to see thank to your contribution.

[@michaelcasper4727]

@@NickyNiclas The green part of the spectrum just uses the least energy to equal red and blue - that spectrum chart shows energy (given) at each wavelength. Red and blue have the most energy. The sun has the same spectrum shape and matches the absorption spectrum of plants. In fact, red and green LEDs were the first light emitting diodes made because of the low power requirement. Most white LEDs have phosphorus in them which emits a bright, full color spectrum light. A LED is efficient if the color index is above 80.

[@christopherkarlon4463]

Man you got me on that project, had i always think to do this in my apartment, but the price of materials on brazil is too high to test. Thanks too much for the effort.

[@MCsCreations]

Fantastic! Awesome work and testing, dude! 😃 Some shoyu and here we go! 😬 Anyway, stay safe and creative there! 🖖😊

[@greatscottlab]

Thanks :-) You too

[@lindateppler3058]

Thank you! This was a great video!

[@CallousCoder]

About 12 years ago I invested in what is called “vertical agriculture” where lettuce and tomatoes were put in trays 1m squares and stacked 5 meters high. It’s tier had I believe they were special green LED wave lengths to activate the growth. That really works nicely. I sold my shares when BlackRock became the major share holder.

[@nortenhardenberg1598]

You will be the first German Pioneer to produce the best Marihuana plants in the world with Your Systems!

[@greatscottlab]

We will see ;-)

[@jonahardayfio7746]

This Scott guy really is Great!

[@bluerilius4362]

Great educational content as always

[@samsungsexy7164]

Well done Scott👍 Now you generating contents more related to human normal life. Theres a huge audience out there for you to tap in 🤗

[@ucantSQ]

Delicious! I'm going to look into this.