I purchased a PAR metre a few months ago and it was so eye-opening. I was burning my lettuce plants and the meter help me get the lights far enough away to prevent that.
This info saved me hours of messing around trying to figure out why my plants were burning under my LED grow lights. Found out the cheap 3-in-1 moisture/light/ph meters are reading FOOT CANDLES, not Lux as a PAR meter does. After purchasing and using a PAR meter I have tuned my indoor plants beyond what I thought possible. Felt like I was starting from scratch. I've since found out what reflective surfaces add to the growth response and where to place them. My PAR meter has found dead spots in my grow space and allowed me to spread out the brighter spots. Finally my plants respond to all my little micro tuning. Lastly I have discovered exactly how much LED lighting I need AT the plant and where on the plant. Its completely changed which type of light I use now. Hint, I don't use the heavily marketed large area LED assemblies. When you get and start using one of these meters and see the actual plant response you will know what I'm talking about.
I get so confused with all this stuff so abit of advice would be much appreciated. As i understand it, led’s give out a different type of light compared to hps / mh. What light reader would i need and what sort of ranges would i need to be ? Im going into my 2nd week of flower. Ive just followed manufacturers advise on distance in inches but would prefer to know exactly what amount of light my plants should be receiving as a pose to just the rough distance. Any feedback would be much appreciated, Thank you 👍🏼
@@thommacfarlane8769 I use Mylar survival blankets purchased an outdoor stores. They’re very cheap but one needs to tape the edges to prevent them from ripping easily.
In the last few years I started working for a company distributing hydroponic lights and I had to get my facts right. Thank you to everyone at Apogee Industries and the man himself, Dr. Bruce Bugbee, for these amazing sessions. I've learned so much and your videos are greatly appreciated.
Why is the PAR (PPFD) range defined as a unity in sensitivity between 400 and 700 nm, when plants are (mostly) sensitive at 440 nm and 660 nm? Wouldn't we need a sort of V(Lambda)-Curve for plants which would then be sensitive at those two peaks? And what about the UV and far red range?
I bought one today. The phone apps were stressing me out so I bit the bullet and paid out for one. I'm using LEDs and had been finding it a learning curb. Now with a proper meter I can set my lights with confidence
I wish more companies would put up technical info like this. It helps sell a product much better than marketing people screeching at you. Gonna order a SQ-520 USB come end of month. Thanks!
Ty for the awesome video. Do you know a Professor Linda Wiles, by any chance? I mentioned that I saw videos you were making and she seemed surprised to hear your name, almost like she knew you. Anyway, she's teaching hort classes in NJ, I wish you were teaching out here, would love to learn under you.
Excuse me sir professor I have a question I was wondering if you've ever studied aloe vera in your lab do you have any information on this plant particularly.
501 A thick book sold at a bookstore at discounted price. I bought 2 books and gave to my husband many many years ago. About place to visit around the world. City population and all that. They're at mom's house.
Can a sq120 be used with white leds? I know it's not designed to read the red blue style led lights. But recently led grow lights have been shifting to white. My diy grow light uses 5000k for veg and 3000k for flower. I have been using a lux meter recommend by migro, but the sq120 would be in a affordable price range for the home grower if it can be accurate with white leds.
Magenta if go through the filter of magenta filter we see only magenta colour come out. The other two materialised somewhere inside our eyes. Not on the white screen. The question my student asked yesterday 18.10.2021 page 247 of Formative Practice 8.7 I have to answer according to what it is in page 244.
Hello, thanks for the video. You started very well, but I waited a little more. After all, if we have from the manufacturer, a graph of the spectral distribution and brightness in lumens, then understanding the principles of the breakdown you voiced, we can recalculate the lumens to ppf. It seems to me that this shouldn’t be anything extra complicated or secret, maybe you know a software that can do it automatically?
Theoretically, that is correct. The trouble is making sure the lumens to PPF calculation is accurate. Sensors that measure lumens focus on measuring green light, so as an example if you are using red LEDs the sensor could be missing upwards of 60% of the light. In this case, you would need to trust that the sensor, the calibration sensors, the graph of spectral distribution, as well as your own LED are outputting exactly what you think they are to get an accurate calculation. Even sensors that measure PAR sometimes need correction factors applied depending on the light source, which is why we developed a tool that estimates those correction factors (www.apogeeinstruments.com/how-to-correct-for-spectral-errors-of-popular-light-sources/) as well as developed our SQ-500 series PAR sensors that are accurate under all light sources (www.apogeeinstruments.com/full-spectrum-quantum-sensor/).
what is the unit for PPF in the last video??? you said the FC to human like PPFD to plant, so I got confussed. for this measurment, it should be PPFD not ppf? right????????///
Hi Zhenhua Chen! PPF and PPFD are often used interchangeably. PPF is photosynthetic photon flux and PPFD is photosynthetic photon flux density. The two terms have evolved because scientists have two separate definitions of the term flux. In this video, and throughout all of Apogee Instruments' literature PPF is the same as PPFD. Hope that helps!
thanks your reply, I have understanding on the lighting metric, in my view, PPF like lumen/w, should be tested in the integrade sphare. PPFD like lux. Even i bought a apogee sensor from Amazon.com. you should try to sell on Amazon China. Hahhah.
Hi Bob! The amount of light required for each plant is different. Here is a good resource to get you started www.extension.purdue.edu/extmedia/HO/HO-238-W.pdf. Let us know if you have any other questions or email us at techsupport@apogeeinstruments.com!
Hi Borg, The SQ-520 is a full-spectrum quantum sensor with a USB output and is Mac compatible. You can find more information on the SQ-520 at www.apogeeinstruments.com/sq-520-full-spectrum-smart-quantum-sensor-usb/. We also have a hand-held meter version of the full-spectrum quantum sensor, the MQ-500. You can find more information on the MQ-500 at www.apogeeinstruments.com/mq-500-full-spectrum-quantum-meter/. Please let us now if you have any other questions, or email us at techsupport@apogeeinstruments.com.. Elisa
If plants see all the light between ~400nm to ~700nm the same, why do I see all these grow lights advertising their lights covering special ranges for growth? Example: Light Spectrum: 430~440nm, 450~475nm 620~630nm, 650~660nm, IR, and white Is this just marketing or do grow lights need specific spectrums of light in conjunction with a good PAR output to work well for growing plants? If you have already covered this in a video please shoot me the link so I can watch. Your videos are quite educational.
The amount of a specific wavelength of light a plant DETECTS is relatively consistent across the visible spectrum, but the amount it USES varies greatly across that same spectrum depending on a plant's species, genetics, growth stage, environmental conditions, etc. Sellers are advertising the amount of specific light wavelengths their lights emit in order to help "satiate" a plant's particular desire or need based on aforementioned considerations (growth stage, etc.). Hope this helps
200 mmol/m2 photon is taken from range 400 and 700 and in this range is also green light which is not so efficient for photosynthesis although is needed for canopy absorption as it travels through leaves and it is absorbed little but it is. Best integration is YPF (yield photon flux) which is integrated with photosynthesis mcree action spectrum graph so you can see real efficiency of light source. I agree there is also confusion of density of ppf. PPFD is same as PPF but when meassured in diffrent point in area avarage ppf spread should be taken in account which depends on light source and its spread of spectral irradiance on given area. Avarage area ppf plot should be taken in consideration but dont assume this is ppfd. So to make example in this video it is meassured in center point but if it is meassured lets say 10 cm away from center for each chamber ppf would vary diffrently. Sorry for bad english
Because this guy is the president of the company selling them. Basically running a coo and a monopoly. They weren't even using PAR or PPFD or PFD they were going by lumens which is what humans see. That is what they went by 10 years ago in grow books. Everything he says is as if it's facts and very little could be factual over time.
The conversion from PPFD (µmol m-2 s-1) to Lux varies under different light sources. For more information be sure to check out this link: www.apogeeinstruments.com/conversion-ppfd-to-lux/.
Plants see all thesse collors equaly? ERROR, plant does not see green light by night , it does not disturb the night cycle, plants does not see all the lights equaly ^.^`
Well, there is a difference because they actually "see" it, as it consumes the green photons, they "see" all the color as equal but do not consume them as equal.
Excuse me sir professor I have a question I was wondering if you've ever studied aloe vera in your lab do you have any information on this plant particularly.
Aloe Vera is exceptional for plant ability to resist disease , as well as root dev, i use it in a solution especially for cuttings and seedlings into early veg.
