A question about Led lighting for plants to Sweden's leading researcher on the subject!

HaveLed_ledr you read my blog you already know that I don't really believe in all benefits and claim Led lighting for plants such as that it will be so much better than the lighting that we are hobby farmers usually use as fluorescent tubes and compact fluorescent lamps, etc..

I asked the question to one of Sweden's leading researcher on the subject of Karl-Johan bergstrand, research on plant lighting at the Swedish University of agricultural sciences in Alnarp.

My Question

Know the research today exactly what light, wavelengths that are the best for plant growth? I think if that were the case then the led manufacturers have taken on board the information and made his plant lighting after the science.

Why I ask is that I as a hobby grower gets much better results under fluorescent lighting at 2700 k mixed with 4000 k and 6500 k with T5 tubes are quite energy efficient. I have tested a number of different Led plant lights and the one that worked best was just blue and white Led light? Most have plenty of red and some blue. I think the plants need a much wider range of colors to feel good.

Best wishes,. Stig Häggkvist Chili hobby growers.

Reply by Karl-Johan bergstrand

Hey Stig!

You usually find that the red and blue light are most important, because chlorophyll has the highest absorbance where. In our research, we have, just like you, come to the conclusion that white light is beneficial. The reason for this is surely just as you say, the light of other wavelengths than red and blue needed for some specific processes in the plant.

Much of the older literature available is based on experiments using filters that gave red or blue light, which was not a "pure" light but contained other wavelengths as well, and therefore there was a decent result even in "red" and "blue" light.

LED gives only a certain wavelength, and then you can have problems if they grow in such a light.

Led suppliers look unfortunately often only on such old literature and find it hard to throw old truths and take to heart the latest research results.

Glad you found a light that works well for you, good luck with 2013 year chiliodling!

Best regards

Karl-Johan Bergstrand

Of course the answer was interesting? I think for myself, to take Plant Led the information with a grain of salt and not believe everything that is written on this topic…

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15 Responses to A question about Led lighting for plants to Sweden's leading researcher on the subject!

  1. Jimmy says:

    If you read your question again and you'll see enough answer , the reason you have better growth with 2700,4000, 6500 k is that all those pipes let me guess 830/840/965 contains 3spikar each in addition to 965 full spectrum of blue/green resptektive red part of the spectrum.
    DOM tubing you are using dots iofs in pretty close to each other what mutandis blue/red part the instresant here but you get a wider range of sentence for chili interesting light.

    And as the sas before the led gives a very narrow part of the spectrum.
    White light is of course not without a mixture of all colors that not only are our brains pour but who believes that there is.

    Blue led 1 nail (With the nail, I mean top of light energy say 430nm) as example
    Red led 1 nail
    White led 3 spikes , in order to get white light, you must mix the red/blue/green
    the surface of the part that creates light are of the same principle as for fluorescent lamps , (I think)
    Do not know about NGN became wiser by this but fuck it 🙂

    Self now I have an experiment set up just waiting for the chilli to look up which does not seem to want to do 🙁 but where I'm going to test my LED that I built for a bit so I can turn off all ties after piece and taste , so the test is simply Red vs. Blue.
    I would argue that blue gives compact plants but some seem to be in a different view and some experiments do not suggest keeping in my direction as we see :)!!..

    • Stig Häggkvist says:

      Hey Jimmy!
      I get just as good results even under the pipes separately. Both bloom and grow fruits in tubes 965 even though it is more blue in this tube, I see not much difference so it doesn't seem to be so sure what uses of these two 965 or 840. Well I know that white light is a mixture of all colors and it seems was just a wide light spectrum is what chiliväxterna want. I know that the plants become more compact in very blue light I have tested, they become much more elongated under red light, according to my tests and it is not at all what I want. Update me about your own experiment.

      • Jimmy says:

        Writes a little mess here then now that the experiment is started , inside the day2 now,
        everything is available to follow on my own blog then of course : http://jimbanero.blogspot.se/

        A little funny that you have been in contact with his doctoral student at alnarp, I have also regarding their sk led experiments that I believed to be quite wrong that is the Foundation of the exeriment I nozzle at driving now, Unfortunately, I can't find it right now.

        But the whole thing was that of course expose seedlings for blue/red/green/white light , read a little more closely so they had 8timmar Sun 8 hours night 8 hours led , Additionally, I thought the blue spectrum was a bit wrong 860nm or similar will not remember but he stood and argued strongly that blue gives extension (which also appeared on their pictures) and I intend to refute he :). or so I krosasd haha!

        But clearly fluorescents best everything from 830-965 but I prefer 840 Thanks to the highest purvärdet , and it work from germ->fruit.
        Dual watt against the stuffed voltage against today's when they had the outperforms all that was with horse lengths

        • Stig Häggkvist says:

          Hey Jimmy!
          I also think that fluorescent lighting with color 840 It works best, and it's always fun when others get the same results by the fluorescent lighting. A good sign that I have not been wrong.

          • Jimmy says:

            You have 100% right, and it's proven in terms of computation, of course, there are dom tubes that are 1% or our sharper but then we're talking tubes for several hundred overcharge for a 840 that philips itself says is the best for plants.

            check out my blog at “links” – Defdac pur list where you have many moves to choose from addition there a calkulator where you can add your own pipe joint or whatever you want it, you can certainly entertain yourself with a few hours at least 🙂

  2. Interesting. Running itself both with red/blue, mixed fluorescent lighting and LED with blue/red/green. It's hard to tell what works best when I think everything works quite well. The advantage of the LED is that it is possible to make lamps with different direction/dissemination of light which is a must for me because I have limited space. If I had space I probably kept me for fluorescent lighting alt LED with RGB colors to get just the wider spectrum. Think the main thing is that you can deliver a lot of light which the plants can take advantage of.

  3. Jimmy says:

    460NM, it would of course do not stand 860 haha was probably a little tired yesterday 🙂

  4. IDA says:

    I'm so glad I found your blog, Stig! I'm not a chilifantast but there is a lot to improve in even for a flower lover like me. 🙂

    I'm going to build/design your own solution for lighting (have had no lighting at all previous, only window facing South) and have a look at your building and then began to think about whether the verkligem is fluorescent lighting I want. LED can mean lower electricity bills and an environmental gain and then I found your post about the comparison. Brilliant (!) Info for a challenge to students like me!

    It seems to me that the most convenient thing to do would be to buy T5-lysrörsarmatur and 840-tubes, BUT I get the most bang for your buck when? I do not want fixture that draws a lot of power and then one can always step up a notch in price range and then it feels like it all of a sudden the cost the same money as an LED solution in all cases and also draws more power, so now I'm a bit ambivalent. My idea is to have a system where I have lights under each shelf for the illumination of the plants on the shelf during. Is it best to have a fluorescent light fittings with two tubes on 28W or an LED strip (or more) If you compare both direct and operating cost with a solution that delivers the equivalent results of the plants?

    Hope you understand what I mean and you feel compelled to figure on my thought, You seem to have many wise thoughts!

  5. Stig Häggkvist says:

    Hi Ida!
    If you are using T5 tubes so you can save energy compared to if you use T8 tubes where T5 is more energy efficient if you have the right equipment and supplies. It's like you say more expensive buy but considerably cheaper than Led lighting for plants. You could save energy by using Led lighting, I do not agree with the 30W Led pulls just as much as 30W T5 tubes.

    To a 15W Led for plants could be compared with 75 – 125W in terms such as fluorescent lamps or CFLs are just misleading as these comparisons are against the incandescent lights that no one what I know grow over time 90% of the lamp's power to create heat rest 10% the plant can be useful if the light's color is the right.

    If the comparisons that you can find on the net would be against T5 tubes and compact fluorescent bulbs so you would see that there is almost no difference at all in terms of energy saving. Why they do not compare against just these lights that we may be using your own hobby growers can now figure out…

    So you save no energy according to me that use of Led lighting for plants. You can save a lot of energy by replacing your standard incandescent lamps mod part of your lighting at home in the House/flat that's true but it's a completely different thing .

    Good luck with lighting the building and do you have any questions then just ask the 🙂

  6. IDA says:

    Lovely! Then I will continue my building plans with fluorescent light fixtures in sight. Because it is a subject bytes (thoughts on light scattering (the width of the shelves), choice of fittings, etc) I will get back to you with comments in more appropriate blog posts. 🙂
    Thanks again!

  7. Patrik Hultin says:

    Old thread but relevant for me :).
    Now a few years later to get a “regular” led by the same Watt as a low energy for essentially the same money. Now, I mean common led lights that you buy at ikea type that is intended to be used in the kitchen lamp etc. Say a 11w low energy lamp. Is a common led illuminated (that looks like a light bulb) at 11w as well as plant lighting?

    • Stig Häggkvist says:

      Hi. It may be it depends on the quality of light. A plant bulb with low watt is usually a spot to direct all the light down a PART that replaces a bulb is omni-directional and must be placed in one screen so the light is directed downwards. Keep in mind that 11W is not much energy to power up a plant.

  8. Johan says:

    Is there anyone who has tested plant lighting with full spectrum (LED) and have experience in this? I am thinking mainly of spices and chili and tomato mm. Maybe even to my avokadoplantor =)

    I have found an exciting here I would like to try it but do not know if it is worth the extra money compared to a “regular” Replacement lamp.


    Does anyone have experience of this?


    • Stig Häggkvist says:

      Hi! No it's not worth the extra pennies. In white light, you have the full spectrum and if you now have to use LED so buy a good white LED for plants or use regular fluorescent lamps or compact fluorescent lamps.

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