How Much Light Do My Plants Need? Timelapse Grow And Yield Results

hi and welcome to the micro YouTube
channel my name is Shane and I’m the founder of Migro today I’d like to help
answer the question how much light do my plants need when we’re talking about
lighting for plants we need to be talking about the unit of measurement PAR not lumens or Lux which are units of measurement of how we perceive light
in terms of brightness PAR or photosynthetically active radiation is a
measurement of the useful light for plants and we measure PAR of our
photosynthetically active radiation using a quantum sensor in this case have
a Apogee SQ 500 which is a very accurate quantum sensor and we’re going to use
this to measure power across the grow area when we measure power across the
grow area we don’t just measure the light in the center so you can see here
the sensor is positioned directly underneath the light and we’re getting a
an output here on our visual display in hundreds of power of 250 and you can see
as I move the sensor over the power level here reduces to only 60 power at
the side of the Grove area so when we’re assessing a grow area we measure the
power level right across our grow area so we divided it up into a grid we’re
going to measure in each of the squares on the grid in order to assess how much
light is going to be reaching our plants we’re going to put plants into each of
these grow bays we have three lined up and we have the grow lights on a
different height by hanging the grow lights at different heights we’re going
to achieve different power levels in each of the different grow bays where
the light is on lowest it’s going to be the highest power level but also it’s
going to be quite concentrated in the center and we when we have the light
positioned higher from our grow area we’re going to have a better spread of
light but the lament of power reaching the NGO area is
going to be less because it’s lost it’s been bounced off the side and it’s
illuminating the side walls and not reaching the plant area so the height
that we’re measuring at that we have this grid is positioned about 15
centimeters or 6 inches above the top number part but this is just to give us
a common claim and our measurement surface which will represent the plant
canopy when we put the plants into the pots and do our comparison grow so first
thing we’re going to do is we’re going to measure the power levels across the
grid in each of the grow areas and we’re going to look at those levels before we
put the plants in under our grow test so let’s measure the power levels in each
of these areas and then look at the results so the quantum sensor is being
positioned in each square in the grid and the measurement of photosynthetic
photon flux density is being taken in each square this is the amount of
paradise that’s impacting that particular area when we take the overall
stimulated plant canopy we can then overlay the individual measurements in
each square on the grid and from these measurements we can produce a par map
which shows the gradient of prior intensity across the grow area and we’re
also able to calculate the total level of par for each glow area so we’ll show
each of the parallels now side by side the lowest one 25 centimetres has an
average power of 634 but a very high maximum at 2130 which is a significant
hotspot the middle hanging height 45 centimeters the average power is 10%
reduced at 572 but a much better max power at a thousand 60 at the higher
hanging height the average prior is very significantly reduced but it’s a much
more even coverage with juste hotspots really the optimum hanging height here
is the center one because we’ve achieved a trade-off between having the maximum
amount of power for the growing area and having a high level in the center but
not such a high level that it’s going to cause damage to the plants so we’re
expecting to get the best productivity and grow the healthiest growth in the
center Bay so here we have each of the grow Bay’s planted in each bay there is
a tomato plant and the rear and bedding plants to the front the soil pot sizes
water regime temperature environment etc all the same for each one the only
difference being the hanging height so the tomato plants their totem variety
they’ve all got a similar amount of early fruit on them on the front we have
adding plants which should provide very quick route and should show us some
flowering characteristics and some stretching under low light and good
dense growth under high levels of light so let’s get these guys going under the
time left to go we’re going to run it for four weeks and see what comes out on
the other end so you’ve seen in the time-lapse go over
the four-week period there’s quite a lot of growth in both the tomato plants and
the bedding plants we look where the light level was least I the light was
hung at the highest level there’s quite a bit of stretching here has occurred on
the tomato plants of reaching for the light so not enough light for that for
the tomato plant and also on the bedding plant huge amount of stretching it’s
reaching out way outside the part of looking for light in the center one the
light level for the tomato plant was probably after them and that it gave
very good growth nice healthy growth whereas the bedding plant was still a
bit further from the light and a bit too far and stretched quite considerably on the lowest level height level to the
light there was way too much light for the tomato plant so it has burnt and
been damaged by too much light intensity where it’s got within the six inches of
the bulb however the bedding plant has done very well and it’s very bushy and
dense growth with little stretching and lots of flowers so now we can have a
look at this tomato plants and see how they did in the grow test on the left is
the plant that was under the light at the high level so got the least amount
of light and you can see the stretching I think it’s evident right here you can
see the the tall distances between the nodes on the growth and it’s a fairly
like Rose on the top the yield itself is minimal
three ripe and a three unripe coming up behind us and very little else you can see the middle which was that
probably the optimum height the middle level height and that’s got good dense
growth very healthy no sign of any damage on top and an excellent yield
lots of tomatoes ripening and loads coming on behind just showing how
healthy the plant is and the last one was our low level plant
unfortunately it’s got a little bit of burning also stretched up behind the
light but yield was good it just didn’t have the comparable amount of you
tomatoes coming up behind so now we have the results for the bedding plants you
can see from the left-hand side was the higher hanging height or the least
amount of light and we can see over on this side we had a lot of reach coming
from the plant still pretty healthy growth on top and but not as has many
flowers many blooms as in the center one which again was medium height had quite
a lot of stretch over the edge but also very thick growth on top and on the
right-hand side we had the bedding plants that were closest to the light
and you can see here that they grew up nice and bushy nice and thick and lots
and lots of flowers so in short when you’ve got the light
far away our low levels of light we get stretch and when the light intensity is
high either light is close to the plants we get Bush dense growth so it’s very
interesting to see the outcome from the experiment where we’ve had three
different grow setups the only difference being between each of them
being the hanging height of the grow light and the resultant power levels
across the canopy of the growth in the difference between each hang
height was only ten centimeters or four inches so you can see that the
sensitivity of hanging height is quite high and you can have dramatically
different outcomes in the health of your growth and the yields from your growth
depending on the accuracy and the quality of your lighting setup so two
little paralyse we’ve seen results in stretching and low levels of
productivity to high levels of par and low-hanging height results in in high
intensity of power hotspots in the center which will damage your plant and
the adjustments to find that optimum level is very fine within as I said 10
centimeters you can vary from a good outcome to a bad outcome the setup we
had initially was done using our quantum sensor or Apogee esq 500 this really is
the best way to understand what the best hanging light is and to manage the trade
off between hanging low and getting the most par and hanging high enough so that
the hotspots are reduced and the part is spread as evenly as possible across your
area so I hope this helps if you have any questions please let us know and
please subscribe take care

100 thoughts on “How Much Light Do My Plants Need? Timelapse Grow And Yield Results

  1. I just discovered you through your giveaway (which I didn't won) but at least I found your company

  2. Excellent video, not heard of PAR before. Good information you have a new subscriber. What lights did you use? Be interesting to see LED lighting too. Good work buddy.

  3. 24hours a day for veg 12hours for bloom1000w covers 4x4good,…(3) 600w on 4×8 is best cheapest

  4. I wish i could afford to buy your light just so i can show my support. You are an awesome dude keep up the great work.

  5. You need to do cm/inches for us Americans who dont use the Metric System

  6. How many of this CREE CXB3590 (regular ones) you recomend on a 4×3 grow room? thanks in advance !

  7. If your growing cannabis you want 55watts/square ft. For ex . 400 watts is good for a six ft square area 1000 wattsis good for 16 square ft.

  8. Cool! does this sensor works with Arduino / is there an alternative that will work with arduino.

  9. damn i thought this was about weed i just noticed when he started to show tomatoes and shit but he looks so high lmao

  10. Thanks for doing this. Been studying light and am surprised I have come across this video sooner. I have a mole light reader. How is that different from a quantum light reader. Thanks again!

  11. Excellent test. I did not think the light varied that much. Thank you. Eat a mint…

  12. Im confused, yes I know Im stupid. How does that grid square measured as 2.5 x 100 = 250 par turn into 2130 par on your par map? It doesn't make sense?

  13. cant you use reflective materials on all sides of the plant to increase the level of PAR in all areas? e.g. mirrors or even paper foil?

  14. It looks like the tomato plant on the right was doing much better in the beginning than the center one, up until it started growing too close and onto the light. The center one grew but didn't have to stretch due to just enough light, but it didn't have enough light for the most vigorous grow possible. The one on the right did until it was overwhelmed. You can even see how the big leaf nearest the light was trying to not grow up into it, up until the point it could not itself keep away any longer due to the stem grow below moving it closer. Then the rest of the plant just grew like a bowl away from the intense center. I'm sure if that light would have been moved up as the plant grew it would have blew past all the others in production.

    I know this isn't the point of your demo but it's worth noting to show the importance of monitoring your grow light distance thoroughly throughout a grow. People don't realize that indoor lights are nothing like the sun when it comes to intensity losses relative to distance from source. If a measurement of the sun is taken and you get 1000ppfd at 20 feet off the ground you will get 1000ppfd at 1 foot of the ground. It makes no difference. The sun is so large , far away, and intense that small changes relative to those parameters are inconsequential. If they weren't then we would burn up and die just by standing outside on the top floor of a sky scrapper.

  15. This was very useful for getting a better grasp of spacial lighting design for growing systems. Would be helpful to have a little more detail about the dimensions of the setup, I approximated by taking measurements from the video. Also, would be helpful to know the specifications of the light unit used total PPF (mmol/s) and energy Efficacy. Would be great to share a link to optics theory models that predict the values presented in the experimental results. Thanks.

  16. Please drink more water, this was hard to watch, but very informative and frustrating at the same time.

  17. Yield was TERRIBLE for all of them! I get anywhere from 60-90 pounds per Tomato plant. The harvest on those plants were truly pathetic.

  18. Would it not of been easier if he used the same light and just raised it? Or have i missed something?

  19. This video was amazing my man. Great feel for the science but easily get it across to us newbs. Cheers

  20. Excellent talk. Thank you. It's easy to criticise, but nice to see the results. Thank you for the very nice placement. What was the temperature?

  21. This northern irish guys breathing is making me feel like I am suffocating. Also that Belfast A and R in him saying PAR sounds like he’s just saying power. Ha. Gulp….inhale. Pause….PAR. Huuuhhhh pause gulp. Smack.


  22. Cannabis is supposedly an annual plant, yet I have heard
    about keeping female cannabis for multiple years in
    vegetative state to preserve genetic phenonomes for clones;/ how is this done?

  23. . . . wow, thanks, so much, for this great information . . . you opened my eyes to a whole new area in plant growth . . . God Bless . . .

  24. Anyone !: have a small grow space 1.5 square meters=16.15 square feet. 87,500 lumens using LED screw in bulbs white & yellow. 21 Autoflowering plants.Offhand, in general am i using too little or too much light from bulbs close to the plants but not too hot? Thank you.

  25. Best comparison of light height on YouTube I've seen so far especially in time lapse terms,some of the other video's I've seen on YouTube they seem to shuffle the plants around especially when comparing with their own lights-be even better if they would get a marker pen and write on each leaf 1111,2222,3333 and so on, then we would see if they got shuffled around

  26. Is 35cm optimal? Why do you make it such a large difference. Now you should do the same test at 2cm increments from 30-40cm. Then you should do the same test without walls near the test area for another data point. More info more customers.

  27. k… well i need a par meter for sure now.. btw.. should you move the light up if the plant gets too close? or better to let the lower leaves still get light (assuming moving it up would be better..)

  28. good video a question how much light they give to the plants in the day, I mean how long they leave on the bulbs during the 24 hours grace greetings from Colombia

  29. You ran out for 4 weeks but for how long? What was the photo period? 12 hours of light? More, less? What DLI for each area.

  30. These videos are absolutely fascinating and very informative. I hope your business does very well, because it's clear that you care a great deal about your craft.


  32. Not sure it's the intensity of the lowest light that's burning the leaves but rather the higher temperature that close to the light.

  33. Thank you for taking the time to provide us with a well informed and interesting Video. Pay no attention to the negativity, they'll only drag us down. You answered the questions I had hoped to be answered when I watched this. Much appreciated.

  34. Hi Shane i have a question for you. You mentioned that par should not be more than 1000 at plant level. Is that for the leds or just HPS lighting. Also what would the max par for seeding be, is that still the same? I have a quantum meter from Apogee as well. The MQ 510 quantum meter

  35. Do yourself a favor and hire someone to speak for your company….I’ve known quite a few Entrepreneurs and one thing they have in common is Hey surround them selves with sycophants and yes men I told him what they want to hear. Someone needed to tell you a long time ago they’re promoting your own business was a bad idea

  36. The tomatoe plant with the light closest to it did the best up until he let it grow into the light . As one should expect. As long as u can desipate and control the heat closer is always best my opinion.

  37. Great video! Love the time lapse. I've just started my own channel by making a video on how to build an apartment grow light shelving unit 9 racks high for $240! I'm aiming to make some more timelapse videos of growth like you have. It really makes the plants come alive!!! Cheers.

  38. Swing by Check Out My Closet Grow Video!

  39. Plant gets grow and its leaves become closer to light source day by day. Can this case get kill plant?

  40. Would I be able to supplement natural light for my burgundy rubber tree (still young) with a grow light

  41. Dayum talking about getting high on your own supply. Somebody looks baked

  42. What is this grot you mention, do you mean growth?
    What's a fla-or, do you mean flower?

  43. Uh? 45 INCHES right? Cause 45 cm is only a foot n' a half dummy! Must be using Christmas lights….

  44. So.. why not just use the right hand side level and adjust along the way?

  45. The amount of dislikes for this mans efforts clearly show the condition of the world we currently live in. One thing you can be sure of, we will not be experiencing a shortage of DICKS anytime in the near future. Thank you for your efforts in providing knowledge to a severely dumbed down and rude society sir, I appreciate your extensive work to provide us with very interesting info.

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