hi and welcome back to the Migro YouTube channel my name is Shane and I'm the
founder of Migro in this video we're going to look at the effects of different
full-spectrum grow lights on plant growth and yield we've set up an
experiment or we are going to show you a time-lapse grow over the last six weeks
of a selection of bedding plants and lettuce which we put in each of the bays
here we've got three different types of full-spectrum grow light we start off
with the 100 and my goal 100 which is drawing 106 watts it's a full spectrum
LED cob that's been raised quite high because of the were keeping the
intensity of the lights the same in each of the bays in next Bay we have blue red
LED panel type LED in this case it's a UFO and it's drawing about 165 watts and
in the last Bay then we have a dual spectrum CFL which is 250 watt electrics
model with reflector which is drawing 200 watts so we've set up each of the
bays with the same plants underneath the same pbft or power level and across the
top of the canopy and in each of the bays and we've run the experiment for
six weeks we're going to look now to see what the the health of the growth is
like what characteristics the growth has and what the yield is in the end so all
of the lights have been set up to give the same power level across the same
collection of plants under the same conditions the difference in terms of
the results from the growth is going to be determined then by the
grow light spectrum we have tested each of the grow light spectrum using our
sensotec passport it's a spectral radiometer and from these readings were
able to show you the proportion of the different spectrum of light in each of
the grow lights we can show you here the table using the Sun as a reference these
grow lights are sold as full spectrum lights which means they should be
replicating the light of the Sun as close as possible the infrared is
effectively heat and doesn't contribute to light grow to Planck wrote and
neither does UV so we can not look at those for the moment we're just looking
at the proportions of blue green and red blue is known to control plant growth
specifically the lengths of stems and therefore affects how stretched or how
dense the plants are under the grow light spectrum we have shown previously
and it's it's scientifically proven that blue light between about 15 and 20
percent is optimum 15 between 15 and 20 percent you get short dense growth so
there's enough blue there to control and keep the plant growth dense but not too
much because to more than say 20 percent of blue light is going to reduce the
productivity next we have green green is is proven to be almost as efficient as
red in terms of photosynthesis about 95 percent is efficient the big benefit is
that it means system through the the plant canopy and gives you really good
penetration down into your grow getting lots of flower and bud development down
into the plant next is the red the most highly efficient to the
photosynthetically and so we're go to see for these mixes which performs the
best in our grow test here so that's look as a results
we've taken the plants now at the growth chambers to have a look to see how they
did over the six-week test starting on the micro side it's looking at the
bedding flowers good healthy growth lots of nice sized flowers right across the
violas and the pansies looking at the lettuce then you'll see the growth is
nice and dense the main head here it's good and pick it very dense got a growth
there in the center and the smaller heads are nice and dense - looking down
underneath the UFO very good flower development about two violas and the
pansies the growth and the lettuce is a little bit more stretched with very good
weight and dance feet on the main head a little lighter and fluffier on the
younger heads then under the jewel spectrum CFL we've got a pretty good
player development very good for around actually on the viola but here on the
pansies unfortunately got a bit of disease and infestation just the last
few days but they were looking nice and healthy up to that point so no concerns
they're looking at the lettuce you can see it's a much higher growth more
stretching much less dense a lot lighter the
Maine has quite scraggly and lice the smaller heads as well so overall good
good development and all the plants the UFOs probably got the best in the
flowering response and with my grow second and the CFL turd it's not the
lettuce I'm looking at the health of the growth oh my go has the shortest answer
scrote with the what looks like the biggest mass with the UFO second in the
cfl third let's get to the let's harvest the lettuce and see what weights we get
we can see all the results now for the grow test on the left hand side we got
the my grow at 106 watts with good flowering dense growth and highest year
the 380 in grams the UFO draws 165 watts good flowering dense growth and the
second best yield of 272 grams the electrics Jill spectrum CFL badge stirs
250 watt but draws 200 watts I had good flowering but unfortunately the growth
was light and stretched unit developed to a low yield of only 130 grams so
seeing all the results from the comparison grow you can see that the red
blue and LED from UFO along with the carb spectrum from my grow boat deliver
strong healthy growth it's often said that the green portion of grow light
spectrum is not product and doesn't photosynthesize and deliver
yield you can see from the test that the green portion are the mixture of green
into the spectrum and the Cobb LEDs actually delivers a slightly higher
yield for the same power levels across the grow area however the blue and red
LED the UFO did deliver slightly better flowering so there was slightly more
petals and slightly larger size the CFL growth was very disappointing the the
electrics Joule spectrum CFL was badged as a 250 watt but only true 200 Watts
and then delivered a stretched and low yield it's likely that even though the
power levels measured across the grow were the same and the light was was long
as low as possible to the plants that it was spreading the light a bit of ran the
plants and not getting directly onto the grow so probably suffered a little bit
that way but as I seen in in other grow tests the relative yield from a CFL is
much lower than then from LED so hope you've enjoyed if you have please
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