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What is the best grow light spectrum?

What is the best grow light spectrum?


hello and welcome to the Migro YouTube
channel today we’re going to look at the question what is the best spectrum for a
grow light given all the different technologies available be it the red
blue LEDs high pressure sodium full-spectrum LED and then the very
confusing wide range of spectrum that could be selected from each of those
technologies and then on top of that you have the providers of all these
different spectrum telling you but theirs is the best and for various
different reasons and their spectrum has some some properties which will give you
a much better yield and another spectrum and all the while it’s very confusing
because you you can’t really compare these things directly there doesn’t seem
to be any overview as to what the spectrum really are made up of and what
are the difference in our trade-offs and between one and the other so we’ll try
and describe here and explain first of all what in these different grow light
spectrum what makes them different and then what carat growth characteristics
you can expect from plant your plants who are grown under these different grow
light spectrum we’re not going to use our own opinion in generating this
information and providing it here we’re going to use a comprehensive recent
study the effects of different grow light spectrum on plants and it was done
by scientists and Utah State University just last year and we are going to show
you going to extract the critical information from this study and share it
with you and hopefully as straightforward and simple away as
possible to understand so in this study they used eight different grow light
spectrum and you’re just going to show them here what their makeup is in blue
green and red which are the Constituent colors of our life you can see that they
used three fairly extreme examples which are almost pure
blue green and red they’re not generally used or widely available is a light
source but they’ve used them here for demonstration purposes for this
experiment and so we’re gonna see what the the extremes were producing in plant
growth the five spectrum in the middle however are are widely available and the
the most commonly used grower light spectrum for grow lights and it starts
off with the on the left-hand side that the warmer or lower color temperature
and light mixes so you know typically this would be down at the HBS spectrum
where you be getting a warm orange light and color temperature of around two to
three thousand Kelvin and then as you go along to the right you’re getting an
increase in the amount of blue in the light spectrum and this turns the
overall color from from being more orangey to more blue and you get the
cooler higher color temperature spectrum when you have more blue mixed in with
the the red and the green for each of these spectrum then the in this
experiment seven plant species were tested they were tested under different
levels of light but most importantly they were tested for different growth
characteristics and some of the growth characteristics such as chlorophyll
concentration P atoll and leaf area we’re not going to look at here because
I’m not critical to us we’re gonna look at the ones which are most important as
indoor growers which is the yield and mass and the density of the growth which
would be defined by the stem length or the distance between nodes so we’re
looking at at dry mass yield first and you can see that the red blue LED
spectrum perform the highest it just picked the other mixed spectrum by a
small amount but was definitely the highest so we have
that and the mid temperature to the three and a half thousand K spectrum
very similar to the my go spectrum are within 5% to each other and fairly clear
at the top very interestingly the red and the green and the blue and where it
is not a large mixing of the spectrum that they perform at the lower level so
it does prove that you’re better to have a mixed spectrum rather than a pure
spectrum in any particular of any particular color next thing is you can
see that the the green and the red are very closely matched so they are as
within 5% of photosynthetic efficiency and the blue is significantly less than
the red and the green but if you pick a red blue green mix where you have blue
in proportions of around 10 to 220 percent the productivity in terms of
your I put whether you have green or red mixed with that it’s going to be very
similar so really we’re just looking at targeting 10 to 15 10 to 20% excuse me
blue next thing we look at is the stem lend and it can be seen that the from
the graph that the cool blue color produced the shorter stem lent and we’ve
set that at 100% very interestingly the pure blue actually generated longer stem
length so you know it does it does demonstrate again that you’re better off
to mix your spectrum whichever characteristic you’re going for so after
that you’ve got a range of difference in terms of the stanlon stem
length from the optimum but you can see again that you are within 10% of that
optimum by choosing either the red blue or the mid color temperature so around
three to four thousand k color temperature you will get very close to
the optimum in terms of stem lanta combining the two characteristics
together then which was yield and stem blend your best to go for mixed spectrum
between ten and 20 percent blue and it doesn’t particularly matter whether you
mix that blue with red or with a mixture of red or green they’re going to be very
similarly efficient from the study then we can see that in terms of
photosynthetic efficiency you’ve quite a wide choice in terms of picking grow
light spectrum the next but most important aspect is looking at the
system that you choose so we have taken the measurements from lots of different
bro light testing and also data sheets from manufacturers websites and we have
drawn up a table and this table is in system efficiency which is the amount of
power output amount of useful light output for plants divided by the power
consumed this is shown to you in units of ppfd per watt starting off with LED
red blue grow lights they have a range of about 0.9 ppfd per watt up to about
1.5 that is the highest system efficiency that we’ve tested and the
highest that we can find from any of the manufacturers data
sheets or specifications looking next at hid on the left hand side in the middle
of the spectrum range you would have HPS and ceramic metal halide those systems
have peaked now really with an optimized set up at about 1.4 micromoles per watt
and could be as low as one might come out for washing in a low-end setup when
you go in to use the blue Domino bulbs such as metal halide that system
efficiency drops to a maximum of 1.3 or so the most efficient technology widely
available today is carp technology where people are using and phosphor coated
leds to produce a full spectrum white light and the system efficiency of using
the high efficiency drivers the Cobb LEDs and glass lenses enables you to get
very high efficiency of delivery of light to your grow I’ve obeyed to
micromoles per watt so when choosing your grow light two aspects to consider
in terms of the efficiency of the system first is photosynthetic efficiency and
second is your system electrical efficiency hopefully we’ll be showing
you some information here that will help you to to make the right choice for
yourself for your grow and if you have any issues please let us know in the
comments below please check out the blog for this video on the website also and
look forward to your comments good bye and take care

78 comments on “What is the best grow light spectrum?

  1. very informative! nice video 🙂
    i like the linking towards the experiment(s) within the video… but mostly the explaining for people that don't want to do research themselves…
    however… i AM missing the newer strip lights and quantum boards based on (for example) the Samsung SM651C leds?

  2. How many square feet does 1 of your lights cover ? And nice information I've been fighting myself doing a lot of research but just can't seem to steer away from h.p.s I have a spectrum king on the shelf disappointed in it

  3. ? 2.4/efficacy for both HLG & NEXT light pannel's , better change your' sales pitch. otherwise usefull stat's info , THanC's

  4. regarding HPS MH and Agro (dual spectrum bulbs) what would be better for flowering? Hps or Agro) dual spectrum) ? in order to achieve higher yields with my tomatoes

  5. Hey Shane, I'm curious. Do you have your LED chips manufactured from scratch or is there a specific LED you like to use?

  6. Live in Massachusetts and grow medical cannabis for vets and family I don't have enough light and was wondering if u had any damaged or defective lights you can part with maybe donate money's tight but if u can help us out we would greatly appreciated it u can email me at [email protected] thank you and God bless merry Christmas

  7. Still looking up put one of these in my tent man wish I could have been a tester you looked at for Michigan LED grower and look down for Action 420 and where's the love at for me lol

  8. can i just get a uv table lamp and hope it works? im planning to make a closed self sustaining terrarium and my house doesnt get that much sunlight, so im just looking for a lamp that i stick over my jar day and night

  9. I hate when guy know way to much I like Caveman type   simple  lighter makes fire start kinda tutorial  LOL
    This Bulb is 10 watts  fro Canadien Tire  it simulates  300Waqts of sunlight it costs $10 bucks  You buy 6 and make a circle of surround light and you plants will flourish.
    That's it.

  10. Hi. Migro. Thanks for your wonderful video. My name is An Jia, come from China. We also have a plant grow light. Dual head 40 LED beads 14 blue and 26 red timing fuction grow lamp.This is a new designed, timing function, and beads life longer. Would you like to test and have it ? If you agree, we would like to ship it to you for free. We promise our product with high quality and workmanship strict.

  11. lots of people talk smack about green light and plants dont see or use it, obviously not the case as proven by thisstudy

  12. These are very useful. I am ready to give it a try and buy a plant growth lamp to see if my babies grow better.

  13. Anyone ever hear about RGB led lighting? Wondering if that technology could be used to achieve the correct color wavelength for a particular plant?

  14. Hi,
    Great video, but are you maybe selling blue light a bit short? It's a great study cited with a ton of info, but you began by saying as indoor growers we'll only look at the Mass figures, "quantity", red/green. But that study tested a lot of effects and a lot of the "quality" stats, chlorophyll, leaf thickness, color, compactness, aromas, oils, a lot of the "quality" comes from blues, up in the 20%-30%+ range. Reds and greens tip the scales, but the material is bland, blues and UV bring out the characteristics. I feel the more red, the bigger, but the more different strains look and taste the same with paler foliage. The more blue, the more different the colors, smells and tastes. So kind of a quantity/quality balance… You do great vids though, thanks for info.

  15. What do you think of the bloomspect 600watt led? It's a good quality built light puts out 2,000 par at 12", got the new nukeheads par meter designed for testing leds.☢👍

  16. Could you guys do a comparison with the electric sky es180? It has really even par ratings. That, and the TGL STAR 60/ 3590.

  17. all spectrums .the plants will use what they need,but if growth only halide ,has light like in a stadium. very bright. for flowering high pressure sodium has amber color to gather is a better yield 24hours for veg ,12hours for flowering,trim all sunleaves 2weeks before harvest ,gets more all over light bigger yield also try adding green sand and granite dust to your ferts inceases yield exponentially

  18. Im confused as to why its RGB. Red and blue are primary colors. Green is a secondary color. It should be yellow instead of green. RYB. I want to see how the pure yellow light spectrum results.

  19. How about the 12000K-15000K COB white LED effect of action?or must use three colors of the same color temperature?

  20. Not an expert here , my experience with different lights started in 1975 with metal halide ! I've tried all of them all and ended up with one 315 CMH , two 150 watt hps converted yard lights , for a 4×5 room ! I grow 6 plants , yield and potency skyrocketed nothing else comes close , 24 degrees constant temperature with 4" fan ! Friends have success with other combos but potency is not there ! I started with one 315 3 years ago in a 3×3 tent , results same as above .

  21. Shane thank you so much for these videos! I would love to thank you somehow for these amazing tests! I have the red/blue light. 3w leds. 65 red and 17 blue along with 4 orange and 12 white 1 infrared and uv = 100. And i can tell you from my cannabis growing that stems stay super short even after 5th node at 5cm! Its really a damn truth! Those type of lights grow most compact plants (okay excluding 5000k) from seed to harvest. And conversion factor (i use to multiply with lux and get ppfd) is pretty high – 0.0292.

  22. Doesn't appear green light is prevalent in the market. I was assuming given that green is the dominant colour in the plant world, it wasn't important in plant development. The green we see when we look at a plant is reflected light that the plant hasn't absorbed. I've looked at a lot of grow lights, haven't seen green.

  23. Shane I got a great idea for your tests! What about using different kelvins?
    For example side by side test with the top ones 3000k-3500k-4000k. I didnt notice that type of video and i think it would be a boom 🙂 and for colder whites 4000k-5000k-6000k. Good luck

  24. Very informative video, amazing channel. What you think of them quantum boards with 2 of the 10 led arrays that are 660nm? im deciding between a quantum with all 3000k leds or one with mostly 3000k leds and 2 led arrays with 660nm on it.

  25. Whats the difference between a super hps and a duel and is it best to use tge dual first then the super for flowering???? Cheers

  26. I used to grow using a basic 2 bulb 4' flourescent rack for the vegetative stage of my plants and they did pretty good, the trouble came around when the flowering stage came then you really need to pump out the light.
    At that point you can just double your lights and transplant into a larger pot but I've never really got that far yet, I've always just let my uncle take care of the later stage lol.
    The future looks fairly bright though!

  27. I cant wait to own some of your lights.
    The information you provide in your video's is fantastic

    I cannot tell you how grateful I am for your work.

  28. Good thing I've been growing cannabis for 20 years indoors. I'm from the days we rebuilt out MH 750 watt magnetic ballasts. Then it turned to hpd magnetic ballasts at 100 watts.. To 2019 amd I just got some hlg 600-H QB v2 led lights at 620 watts. Amazing.

  29. hello sir,I'm not good at English.
    and I just want to ask is !
    I want to optimize the 200×200 room area.
    which lamp should i use ?
    optic 8+ , solo 1000 , quantum , sp 250 x4 ,
    Can answer for me.Ty sir.

  30. I start seedlings every year for a habitat restoration and cannot find reliable information on what is the best color/intensity for starting seedlings (prairie grasses), then what color/intensity to grow them for a month or-so until I can put them into the greenhouse. My first year with Chinese LED's went pretty badly as the instructions they provided burned the plants. What is the best light for starting seedlings?

  31. I think you should think of it as a budget; light per watt, light per $, light per space, light per heat. I guess almost all light sources have a place.

  32. Very interesting, but I didnt understand a word of it (apart form red,blue and green?)…..should have paid more attention in physics class!

  33. Do you have any feelings about black dog led? I feel like I’ve been doing circles looking for an led that’s above budget price but not above 1000+ dollars, I’m willing to spend up to 1000 on a light

  34. How humidity and temperature relate to spectrum light and also would the rate of color transition also affect growth? Thank you very much for your research data

  35. 'amount of useful light output' / Watt. I would love to see an example of this. Because this makes no sense to me or is way to obscure.

  36. 6:40 why does 98% red produce the best stem length?? I thought a white or cooler light is considered as better for grow.

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