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The Truth About Grow Lights | Lets Clear the Confusion
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- Опубликовано: 30 ноя 2019
- The internet can really make it confusing for some people who want to grow plants indoors. There is so much old and new information and changing technology and methods. How can one person sift through it all and know what the answer is. The best way is to experiment which is what I do, but for those who don't have the time or patience, this should clear things up. At least on this subject.
Hey, good video.
In regards to what you said at the end about video editing, being lazy, etc. For me, personally, it's the information and the method of obtaining and presenting it that I care about. I've always found your videos great. They're easy to follow, don't have distracting music or anything like that, and seems to me you're more about the actual gardening, the scientific method approach, and then the information or result you get. And then you convey your findings in an straight forward manner.
Maripickles.
Adjust the spectrum according to your needs.
I recently swapped a Mars Hydro TS1000 for a cheap, warm white, 10 watt LED bulb for a 2 week old plant as she was growing extremly bushy under the Mars, basically no stem growth and only spitting out new leafs.
Now she is stretching nicely so the canopy opens up and gets more light.
Will switch back as soon as she has become to big for the small bulb.
Setup looks great! Accurate info too, it covers everything I've seen demonstrated.
When the plants are outside in the sun, they don’t care if it’s 6000k or 3000k. When the plants are indoor, all of a sudden they start to care.
Thank you short and concise. Great subject for the future: starting seedlings under led lights, there is very little on you tube.
Hugues Demol agreed, have been searching for that myself and only found a couple of videos. +1 for the idea
Red spectrum sun light penetrates year round.Blue spectrum is stopped by the sunlights angle to the upper atmosphere in winter and red is slightly reduced.So to simulate seasons for temperate zone indic maripickles reduce blue light.Winter removes blue light so there is less light but in turn a higher PERCENTAGE of red light. Near the equator where sati maripickles grow the angel is less so the blue light still penetrates for the most part, year round and red is not reduced. When the plant has no blue it thinks it is in the shade so it stretches to find the direct light again.
My first maripickles grow had actual flower at every node on day 7 of 11on/13off using 140w of 6500k ($50 shop light) & 12w of far red ($30 GrowMou5) LEDs at 30k LUX. 🤷♂️
Short and sweet. Always good honest info. The production skills are spot on. I really dig the background colors and the whole webcam look. If only more videos looked like this. Bravo!
I just realized this video is a year and a half old!.. lol.. oh well... either way, i wanted to drop one minor comment... yes your right... you can flower and veg under the same light.. the same is actually true with HPS and MH... But... there are some subtleties...
First, from a photosynthetic perspective, you are completely correct, a photon is a photon, as long as it gets absorbed.
If we look at a single chloroplast we will see that the main pigments are chlorophyll b and chlorophyll a.
Chlorophyll b is associated with photosystem 2(PSII), and Chlorophyll a is associated with photosystem 1(PSI)
PSII has peak absorbance at 680nm, and PSI has peaks at 700nm. Since PSI passes to PSII and there are entropic losses, peak absorption efficiency takes place at 680 nm.
but that's only if you look at a single Chloroplast. This wavelength specific efficiency quickly becomes a negligible factor once the entire canopy it taken into consideration. That is because there are a number of other pigments that can also absorb photons of shorter wavelengths. so the whole plant quantum absorption efficiency curve actually follows closely to the famous mcree curve.
Regardless of the initial wavelength, a photon absorbed by any of the pigment molecules transfers the energy absorbed by successive flourescence events to neighboring molecules until it reaches the action center (chlorophyll a /PSI), by which point the photon will have shifted to 700nm.
so from the perspective of photosynthesis alone, provided all the photons get absorbed, the spectrum of the light source is irrelevant, it's just the number of photons that count.
But if you are creating photons, and you want the most photons per unit of energy, you are better off making red ones, since it takes about 1.8 electron volts (eV) of energy to make a red photon, while each blue photon requires a whopping 3.1 eV., almost double (assumes perfect energy conversion). So barring all other factors, a warm 3000k spectrum light should give you more photons per watt than a 6000k.
and this was true for HID lighting, and was a contributing factor for the efficiency of HPS over MH.
However, LEDs are a bit of an anomaly here. Currently, Blue LEDs are the most efficient in terms of turning wall power into photon power, as in less of the electricity goes to heat. However, because a red photon contains less energy, in terms of number of photons put out per watt of wall power, it's actually pretty close to a tie. So when using LEDs the efficiency gains seen with going to a warm red spectrum just aren't there, but it's also no worse than going with a heavy blue spectrum. So, when focusing on just photosynthesis.. go with whatever has the greatest output of par photons per joule, usually expressed as umoles/j.
This brings me to my second point... rate of photosynthesis is not the only consideration.
Spectrum (AKA. light quality) has an enormous effect on plant morphology...
Blue light supresses cell elongation, and red light (especially far red) promotes cell elongation...
Also light quality does have effects on flower formation and maturation rates.
When these morphology and maturation metrics are taken into consideration, it actually does still make sense for "maripickle" grows to use a blue spectrum when vegging to promote tight internodal spacing, to then switch to a redder spectrum once in flower to accelerate biomass development, and promote more vigorous flowering. Additionally, advanced growers can mix in periodic far red treatments to shorten the flowering period, or UV to enhance terpenes.
So.. long story short, yes you can use one light from beginning to end, but if you want to grow like a pro, get to know the effects of light quality on photomorphogenesis.
Appreciate your videos as usual. Not a maripickle grower here - orchids actually, but your insights are always helpful...so let the RUclipss know you’re helpful to all walks of horticulture. ✌🏻
Looking good bro. No homo.
You should put the lights you use/bought in the description below your video. Thx for the content
Awesome info, glad to have found your channel. :)
I only grow only common plants under light but your videos are very useful. You´re THAT handsome by the way!
Nice Work !! Great of you to bring the knowledge !
I grew peppers, tomatoes, cucumber, lettuce, chard, strawberry, and squash sprouts all next to a mix of T-8 LED bulbs at 5000k and 3000k while the bulbs were suspended around the plants vertically. The majority of the plants would lean and grow into the 5000k showing that the auxin hormone is more uniform in growth of thickness as well as elongation under 5000k or to emmited indium gallium nitride. Both bulbs have the outer tube coated with phosphors to scatter the light more uniform while the difference being in the Kelvin temps created by the different compositions within the gallium nitride crystal alloy that are doped on the silicon semiconducter (otherwise known as an LED.) The plants under the 3000K grew leggy with thin soft leaves aside from the chards that grew bigger leaves that were thicker and a much darker green color as compared to the chards under the 5000k control and even an outside sunlight control that were identical to the 5000k control experiment.
Justin G 5000K light has more blue than red, plants under blue light will be denser and less stretchy, but smaller in size in general.
What abou 7000 Kelvin?
Would this work for houseplants like Monsteras,...?
Thanks.
I haven't found a 7000k t-8 LED to try yet, but all three together would be a nice full spectrum of light for any plant.
Would you recommend mixing 3000k with 6500k? I mean it would be the best combination, wouldn't it? 🤔
@@bettereveryday7777 I set up timers that used lower Kelvin lights in the morning and evenings and the higher Kelvin lights during the midday hours and it worked pretty well. In a controlled climate like inside your house you can have a sustainable supply of small greens this way. I had a setup for 2 years in a row that seemed to work pretty well and all I had to do was top it off with fresh rain water and occasionally test the water for nutrient deficiencies. I couldn't do micronutrient deficiencies and I was kind of worried about Mercury buildups and such but had successful runs with the plant growth.
'Maripickles'. That's awesome man! LMAO!!
The marshydro lights have various LED of multiple spectrum. From UV to 3k to 6k
I love the analysis videos.. especially since I'm getting ready to do kratky hydro and I'm looking for the cheapest LED lighting solution using locally sourced items. The options locally are 3000k, 4100k , and 5000k.... It looks like getting a 3000k and 5000k and running them in combo is the best approach. Is it worth the extra cost to pick up a 4100k and run that with the 3000k and 5000k (to make a 3 light combo) for growing tomatoes/peppers/cucumbers?
For general purpose just go for the 4000K. Because your plants will be flowering a lot, 3000K would be a valid option too if they are cheaper or easier to get.
Mixing colors only works with very many leds. If you are using panels or COBs the mixing will not be sufficient
and you will experience differences in growth behavior of plants that are directly under one or the other color.
Having enough light is far more important than the right color temperature btw ;)
But be warned: It is not economical to grow tomatoes/cucumbers with artificial light. Chilies are kinda OK because they are often specialty strains
that would be hard to get otherwise and you don't need many m² to get a decent harvest.
Basil if also nice if you like pesto. It grows really well indoors (Strain: Genoveser). It benefits from the stable temperature and low wind.
I was able to get about 1L of pesto from a 40x40cm Growspace (with 40-50w led iirc) every two to three months with DWC.
And there is a world of difference between the homemade pesto and the store bought crap. I can't eat store bought anymore.
Are you talking about individual diodes, or what? Epistars? What's locally sourced LED lighting wise, you mean just the local "garden/grow" store?
@@circle4922 - talking about the cheap LED lighting options you get for your home at box stores like homedepot, lowes, ect.
@@honeybadger6127 Oh. Ok.
Blue spectrum causes short dark green growth, and red spectrum causes long thin growth. If you want bigger plants then lean toward the red, not much blue is required. If you want shorter plants then lean towards the blue. Seedlings start with blue to keep them from getting leggy. There are many Universtiy studies that show the effect of light spectrum on plants. There are also many experiments on youtube that show the same conclusion.
Ohhh NOW i understand what maripickles are! Last vid i saw makes sense now lols!! 😂😂😂
Just going down the rabbit hole of gardening videos and had no idea wtf he was on about til now... bahaha
@@TriCombStudio goodluck n nice one if your starting this year, seems to be an increase in popularity since last years' increase in food insecurity. I coulda saved myself alot of time had i worked out what gardening zone im in first n THEN pick out my YT channels to follow hehe
If u ever need growlights n can afford them, last years' best bang for ur buck n cheap n easy to run n maintain went to spider-farmer ones
@@kimwarburton8490 Oh, I run an indoor farm for over a decade now but just started down the youtube rabbit holes since the whole pandemic.
@@TriCombStudio Nice! whats the reality like? Its one of the ideas im tinkering with or would like to
@@kimwarburton8490 The reality of handwatering sucks! I need to set up irrigation for sure!! Otherwise it is a fantastic hobby if you enjoy it. I am in Canada and can't afford a greenhouse so I have a spare room converted into a hobby farm. It can be quite productive if I put my mind and back into it but I sometimes only have enough time to murder plants in there it seems. Lmao such is life...
Why can’t I turn captions on? 😔
im confused can i grow in veg stage with a 6000k cob led?
Could you?
I learned a lot, thanks, good work and keep it up!
It is the best video on YT with good and simple explanations. I do grow lettuce and spinach using 6500k LED with about 2500 lumen and is working well. I also try to grow some small cucumbers that need to flower and make fruits. Do you think a 2700-3000k LED with 2500 lumen will be enough? All activity is inside the house. Very little light from the window. I try to become a prepper and also eat some no chemicals veggies. My concern is stimulating flowering and fruit-making. Thank you!
Lumens doesn’t tell me anything. But 2500 sounds like it’s way too little for a grow light
@@GrowingAnswers thank you for your answer. My most powerful led is a 34 w 5000 lumen 6500k . They say is like a regular 150 w bulb. I do not have specialty grow lights....
hey can I use a normal led 6500k tube for lettuce plant?
on a large scale say 500 sqt area vertical farming hydroponics what light should I use?
Akshay Phadtare you’ll get less mass with that high of a kelvin. Try 4000k
@@GrowingAnswers Dang... I just bought a whole bunch of 6500k LED T8 tubes made by GE. A contractors 10pk at Lowe's was $74. I will have to go back and swap for some lower kelvin bulbs. On a plus note... the 4000k bulbs also had a slightly higher lumen rating too I believe.
Sunlight
@@great0789 Lumens are for humans. Plants don’t care whatsoever about Lumens.
I'd like to reference your channel in my upcoming lighting video. I got the channel name, but I can't find your first name anywhere. I wanted to credit your influence on me. Thanks.
Perfect thank you. Definitely alot of confusion on the spectrum debate out there.
My god bro do some amsr. You already have the equipment and your voice is easy to listen to! You can do amsr book readings and other voice work bro. You can make that green and grow boiiiiiii!
Thank you for the clarification ! And what about the neutral white ? 4000-4500K ? Can one grow something under these ?
Yes i use 4000k. Its perfect. Best for your eyes and your plants. Look here
ibb.co/ZfN54qX
ibb.co/mHbMkwR
I have been growing plants on a desk using a cheap 45W 6500K LED and one even flowered.
Higher kelvin doesn’t stop flowering, it just suppresses it.
@@GrowingAnswers I see! I didn't comment that to spite you or anything, I just wanted to share my experience. I don't even know if the kelvin measurement it claims is accurate so there is probably less blue light in there, hence the flowering. The reason I got a 6500K bulb in the first place was because I saw a grower post it and I didn't know better, I just copied what she got. After that, I researched about kelvins and lumens and I just got more confused. But after one botany course and seeing this video, I think I can understand it better now? I also just finished watching all four videos on the white vs blue-red experiment and I am pretty happy about the results because I hate the pink light haha! Thanks for explaining it all so well and going deep especially into the biology of it. I mainly grow begonias and aroids for their foliage (though I do enjoy seeing my begonias flower, too) so I think I'm gonna stay with the white blue light just because it looks better for my eyes. I do have a question for another video but I'm just gonna comment it on there. Thanks and stay safe! Looking forward to more videos!
Can a luminescent light of 3000 K replace a LED light of 3000 K for growing flowers for their bloom (Gloxinia) ?
Is the luminescent light of 3000 K the same as the LED light of 3000 K?
What about BEGONIAS for their LEAVES (NOT their flowers). Their leaves are in different colors, so what I need to choose to stimulate the vibrant coloring of their leaves - many of them have red and pink or black leaves, and a lot of silver "pigment", very little green, with many dots and patterns. Leafy Begonias' main pigment is - flavonoid.
It is very confusing, everybody is saying a different theory.
Our Sun is full spectrum.
Plants need feel full spectrum for optimal growth.
Does full spectrum help with your liver spots and male pattern baldness?
@@Des420
You should see if it'll help your erectile dysfunction
@@markb6295 Why are you thinking about erections? Just get back from visiting your father?
@@markb6295 this guy is such a joke Mark. 😂
@@Des420 you know your a joke...right? You do realize that your the only one crying and acting childish....right? Its funny to watch because the only one who looks dumb is you.
Have a great day bub. Try not to be so angry....😂
you do good man, awsome picture PS & yea that flickering light gone))
I grow succulents and am using Barrina 42w led grow lights at 3500k spectrum. I want more intensity and more compact plants, but with my current 3500k lights they are flowering like crazy. Would there be a benefit to using multiple spectrums with separate lights? Say, buying a 5000k light and putting it side by side the 3500k lights up currently? That way it gets more intense light, but it’s not boosting the reds to cause it to flower more?
Yeah that would be fine
Can you do a video on growing tomatoes please !
jarrett loden check out my series maxbloom vs high bay.
Would a daylight (5K) LED shop light be an affordable choice for growing lettuce, spinach, and herbs? Thank you.
TeePeeB yes
Good information, thank you
What is the effect of wavelenght on secondary metabolites? Like alkaloids.
Is it true that plants with higher latitude do less alkaloids?
I believe that might have something to do with it. But soil conditions also affect that as well. Look into Kratom and how it’s potency is affected based on where it’s growing on the globe.
From what you're saying, I can use a LED light with 3000K-4000K to grow tomatoes and others?
I asked this question in an Amazon product I found with the same specs, the replies were totally negative
Yes
420th like. For the maripickles. Although I'm mostly just here for the lettuce.
Then lettuce partake, shall we? 😜
Maripickles or Marijuana? I'm so confused.
I love maripickles
Nice perspective on indoor garden lighting, but curious on your thoughts for starting seedlings for summer gardens. How do you feel about using 6000K LED from seeding through week 8 or 12 to possibly increase the vegetative growth of peppers and tomatoes that will eventually be moved outside?
That doesn’t really increase vegetative. It’s fine for seedling for the first week or 2, but if suppressing vertical growth is the goal then you just need more intensity. The only thing 6000k is going to do is prevent early bolting on some plants. But that typical only happens if the color temperature is too warm. The most important thing before moving outside is intensity, not color temperature. Possibly a minor amount of UV too. But I’ve never had acclimation trouble with my plants when moving outside. Probably cuz I have a par meter to be able to hammer them with not too little or too much light.
@@GrowingAnswers Great answer, experience based and meter tested; I have noticed matching or trying to match sunlight before hardening off is important. I have not tested 3500K versus 6000K on seedlings yet. With mature plants, I notice smaller leaves under my 3500K LED, which is interesting.
Thanks for the information video and quick answer.
I respect your channel for its info and you are quite a handsome man, it shall serve your channel well. Keep hufffing that maripickles before your vids!
I'm confused about all lighting
can any 36 inch led light be used as a grow light ?????
Sort of. They aren’t all going to necessarily be intense enough. Proximity to plants will vary between models.
Please forgive me for pestering you and I apologize! I'm thinking about adding one Led Shop Light to the 2 4k-Kelvin, 3K Lumen, 30Watt output lights I already have with 1 6k-Kelvin between the 2, that is rated to have 27watts, 3510 Lumens light per 3ft shelf(ves) I already have. Do you think this will help balance things out and produce a better product? The lights will be about a foot above the beginning of the crops lighted surface if that makes any difference. The total wattage output per shelf will be about 90, the total lumens will be about 9k, and should be a more complete spectrum if what I'm thinking will be true. What do you think?
If you are using a 4000 Kelvin light you don’t need to add a 6000.
@@GrowingAnswers I really appreciate your response and what you are doing and teaching!
Very informative, thanks.
A question though, how important are lumens? If I want to grow, let's say, microgreens or lettuce, does it matter?
Thanks
Light intensity for micro greens isn’t a high requirement. Between 100 and 300 micromole. But if you’re asking lumens, lumens is not a measure of intensity.
@@GrowingAnswers Thanks for the answer. I've been watching videos about growing vegetables indoor and somehow got the idea that lumens matter. Even today I was looking at LED lights in my local supermarket to see how much K and lumens they have.
I have to research about micromole. I don't recall seeing that written on the package.
Cheers
I’ve been reading about grow-lighting for a few weeks now as a newbie propagator and have read all the stuff about “red for this” and “blue for that” etc, etc.
Yesterday I read that all this stems from the original leds that were red or blue because these were easiest to manufacture and were most efficient. Obviously there are a lot of vested interests related to keeping the myths alive; hence all the blurb. Also, everyone likes to have a store of “deep secrets” knowledge to share as “experts” on RUclips; and “ever more shall be so”...
So, as a newbie, deciding to keep the costs down, I simply (in my ignorance) sowed 46 Jalapeño seeds on a heat mat under my play room lighting, which I had switched, from halogen, to led to save money. I hadn’t read about grow lighting at this stage.
40 of them germinated nicely after 4 days and I needed to re-pot them after 13 days. Recognising the need for a larger area of lighting I simply increased the number of my 50w GU-10 4000k LEDS from 6 to 25 and re-potted again around 30 days from sowing into 1 gallon pots.
They seem to me to be growing well. There is plenty of lush green growth, relatively compact and I have been having to remove the early flowers regularly. I’ve topped around 2/3rds of the tallest and even double-topped the ones that didn’t immediately fork.
It certainly looks like 4000k bulbs will work out ok for me, and I have read that this is possible. I enjoy experimenting so I’ll continue with my current setup until it’s time to move them outside.
Thanks for your video, it’s great to have a range of views.
No it's actually called the measurement of color. 2700k light is literally a different light or color from 6500kelvin 5500kelvin is where plants absorb the most then it dips at 6000k and back up at 6500k. Measurements are important. The color does matter if you want real product
Would a Xenon Light work for plants? I start tomatoes and petunias in my house. I have a 32 inch Xenon light, but not sure if that spectrum is good.
Never heard of a 2ft long xenon light.
@@GrowingAnswers it's designed for under cabinet lighting, and would be a nice fit. Just trying to research if that light is helpful for plants.
@@Mike-pm2fc it’s incandescent bulbs. No it’s not good.
All test are already done. 2700K light will bring you a better result then 6500K if we are talking about a leafy green and some herbs. I can send a proofs (photos, results of weighting etc).
2700k for the win my seedlings are doing great nice natural internodal spacings nice healthy colo fast growth.
I use 6x 12.5 watt household led bulbs with the dome cut off, it's dangerous though because you can touch the live 240 volts.
You want both.
I dig the picture also 😁
is there a affordable umho/PAR/quantum meter option to purchase?.... the one you have seems to be 100s of dollars, too rich for my budget.
Chris hydrofarm
Yeah well, someone find me a 200 dollar led light capable of flowering 6 plants with the same outcome in a 5 x 5 tent, then I'll stop using HID/HPS lighting. Why'd I say this? Because such a thing is not available. After doing the math on what I pay per kwh in my area on 1000w led vs HPS, the for sure thing was, that in a year, I'd only save $96.00 using a 1000w led instead of.my HPS. For an LED light capable of putting out enough to run a 5 x 5 tent, I'd have to shell out $1000.00 to $1500.00. I'm a home grower and as such, my florescent t5s and hps lights are doing a bang up job. And before anyone says :" But yeah, you need to change the hps after two grows. BS, I've gotten so far, 5 grows going on 6 atm on the same bulb. and while my technique of growing has changed a little, I'm getting just as much volume as I got when the bulb was new. Yes, after a year of use, I'll change the bulb. And it won't be with an $80.00 HPS bulb. Point being, that budget minded peps at this time, will pick HID/hps and even florescent over LED. Well they will if they do the math. Simply because it is cheaper, even if you do add in to the initial price of a flow through HPS the 96.00 saving in elec. and an $80.00 HPS bulb into the mix. At Present you can get an HPS flow though hood light for around $180.00. Throw in about $40.00 more dollars for ducting and clamps for sending the hot air of the hps out the window. And that's a crazy savings over an LED that is $1000.00 to $1500.00. Now I know that these are all words just typed and I can't prove my grow here on my lighting. But I have no reason to lie about any of it, LED get hot too. Hence why every manufacturer of them, puts fans and heat sinks and the ilk on them. Bottom line. If or when the LED greed pigs that are selling these LED lights get the prices down, I'll go with them. But the way it is today! Naww, I'll let the more wealthy keep them in business.
Tony M don’t have time to read the whole thing, but $1000-1500 is incorrect. Some led panels are capable of outputting 50-75% more photons per watt vs hps. And they don’t cost $1000. There’s plenty of options. You could buy 2 lights like the mars hydro sp250 and place them side by side and get more output than a 600 watt hps and have better coverage. Easily enough for a 5x5. I don’t know the current price, but I’m pretty sure that would only cost $500 or less. That’s just one example though. There are cheaper options. Leds also last far longer than hid. Hid lamps need replaced fairly often to maintain output too.
@@GrowingAnswers mars hydro sp250 cost 300.00 ea. x two is 600 and of which will not put out 600 w but only 500w and while photons are great !500w won't get the bud productions I'm getting right now with 1 180.00 hps 1000w light. Not in a 5 x 5 it won't. I get it that there are fan bois of leds. I just don't happen to be one of them. Mostly due to cost of and for a home grower. 7 plants in my 5 x 5 yielded a lil over 1 lb and my plants were only 3.7 ft tall. All on one hps 1000w. Might could have even gotten a better yeil had I played with training the plants more during the veg cycle.
The most valuable thing I have observed in all the RUclips Videos is you have to have a huge microphone. The bigger the mic. the more credible the video! Lol
The reason I got my mic wasn’t even for RUclips. It was to record a spaceX launch with high quality audio.
Thank you.. Thank you
Will you clear up a bit of confusion for me. In one of the comments below you answered:
Q. so what combination (in term of percentage) of each color to make 3500k? Thanks!
A. Best guess for simplicity is 50% 4000k and 50% 3000k. Beyond that it gets complicated. Easiest way is to have 2 lights or light arrays on dimmers and vary them both until the meter shows what you want.
Does 4000K & 3000K increase the K to 7,000?
I know you also said in answer to another comment "lumens is not a measure of intensity."
I know K is a measurement of color so what specifically measures intensity and is that relevant to growing vegetables from seed to harvest?
Lux measures intensity. It’s the next best thing to par. And no you don’t add Kelvin together. Think of it like red and blue make purple or blue and yellow make green. 7000k would be very blue tinted white. You can’t create more blue light by adding light that peaks red/yellow/orange.
@@GrowingAnswers Thank you. You cleared Kelvin up for me but not the lumens.
Webster says "The meaning of LUX is a unit of illumination equal to the direct illumination on a surface that is everywhere one meter from a uniform point source of one candle intensity or equal to one lumen per square meter."
Where does Lux originate if not lumens? Do not Lumens illuminate?
Another source states "Lux is a unit that indicates how much light is touching a surface" while "Lumen is the total measurement of light output from a source in all directions."
How do I equate this to the lumens I need for my plants. You told me to buy T-5's. Those won't fit in my space available for growing. Several of the spaces are 12" x 18" and I am only seeing T-5 in tubes.
We are looking at building panels of LED cobs. Using your recommendation I am aiming for 3500 to 4000 k but does this choice determine the lumens for me? That is what I need to know.
@@nancyburridge You don’t use lumens to measure intensity. Lumens is a measurement of total light output measured in a white sphere. The only thing that matters for plants is the intensity lux or par.
@@GrowingAnswers Thank you. So I just get the 3500 to 4000 k and lux will be what is needed? I am trying to determine if I need to be looking for K and lumens. That is what is confusing.
@@nancyburridge Yes
Oh my! I'm so glad you cut your hair amd beard! You look so much better!
I have a ton of shop lights 4000K-Kelvin, 3000lm, 30W. Will these work for growing Micro-Greens?
Yep
@@GrowingAnswers I really appreciate your research/videos and response!
@@GrowingAnswers If I may ask, why does everyone recommend using expensive 6500K grow lights for Micro-Green farming? Is there any advantage to using the higher K lights for Micro-Greens? I forgot to mention my 4K lights are LED if that makes any difference
@@MaynardFreek 6500 suppresses vertical growth, but it’s not really much different vs 4000k. 6500k might have some advantage in flavor production, but I’m not really sure if that’s true. Most people might not be able to tell a difference.
@@GrowingAnswers Thank you
What is the best K for blooming flowers?
2800-3500 roughly
@@GrowingAnswers Thank you so much for answering
The measurment of colour by W.D. Wright
Usually the internet is right... I usually tell the doctors what’s going on as soon as I show up... I say, the internet said .... and then it turns out the internet was right.
so what combination (in term of percentage) of each color to make 3500k? Thanks!
Best guess for simplicity is 50% 4000k and 50% 3000k. Beyond that it gets complicated. Easiest way is to have 2 lights or light arrays on dimmers and vary them both until the meter shows what you want.
@@GrowingAnswers once you find the balance, do you have the setting constant through out the day or adjusted to match daylight pattern? Thanks
@@jonathant1797 I don’t do that. I use white light grow lights only. I don’t adjust anything except the height or the dimmer to control the intensity based on the plant phase seedlings get less light. That’s it. Other than that it’s on and off.
@@GrowingAnswers thank you!
The sp 250 has full spectrum has 660red enhanced
lost my brother to those damn maripickels😢😢😢
Jared Leto?
That was very informative. Thank you! I bought a 6500k led tube light for my kale. Is that a better light for green leafy vegetables?
I wouldn’t say it is better. But it will get the job done. 3500k and up is all going to work fine.
3000k is the best spectrum for flower if you add red spectrum it's even better.
that standard is pushed by cannabis growers. I grow with 4000k i have short bushy plants with dozens of flowers.
@@igormarinkovic1531 You would have more dense flowers with 3000k. I have used 4000k before it's okay but 3000k to 3500k is the best I think. 4000k with added red would be okay
When you say you are too lazy to edit your videos, is this because of the maripickles? lol
SulforaphaneMeUp I’m not lazy with editing, I’m lazy with setting things up.
pretty close on the Maripickles =)
Great Vid.
How important is wattage?
Watts is not important. Only intensity is. And that plays into the efficiency of the light and the proximity of the light.
@@GrowingAnswers when you say intensity you speak of umol/par? Thanks for that bit of info. Allot growers are obsessed with wattage. Even during the days we have RUclips to educate us.
@@duncanskippers3130 yes, or you can go by lumens if it’s a white light variant. For example, if you have a 30 W light and you place a plant under it just 2 to 3 inches away that’s probably gonna be more than enough light. However, that’s circumstantial depending on the height of the plant, The amount of plants and the type of plant. To answer the question more clearly, wattage isn’t really a number you want to go by for determining white light to buy. It’s more important to look at a coverage map with intensity numbers which most sellers provide
I wish there was a two thumbs up button!
I just want a light for my 72 seedling tray. What wattage white LED would I need? 3,000k? And you are cute as a button!
Around 30 watts 3500-4000k
Thx for responding
In a word,....Thanks.
thanks good info
Mari pickles wow. Hilarious
Actually, the best quality maripickles I've grown and flowered were using halides. The only reason between halide and HPS, yield favored HPS was simply because the HPS bulbs produce up to 30% more light, not because of the blue content. The flavor and overall quality of Metal Halide maripickles was superior which is probably due to the UVB that halides radiate.
Old methods but the internet said so? Ok pal
are you single?