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The maximum amount of light a plant can use for photosynthesis before photoinhibition sets in, is dependent on many, many variables. This is why you will see different reports from different people. Mostly, folks will talk about light intensity or environmental conditions being the main...

@Rocket Soul THIS study talks primarily about R:FR ratios, which are essentially phytochromes in the active (Pr) or inactive state (Pfr). This article also touches on Crytpochrome blue light response and B:G ratios to determine shade avoidance...

I’ll try to keep this short considering I’ve been writing novels just to try to share my perspective on things. For our discussion purposes, it would have been nice had the study been done using say a 3500k (80CRI) that didn’t have as much red in the spectrum. That said, it’s a very similar...

Here’s the juicy parts from the study for those who don’t want to sort through 60 something pages. Spectrums used A yield reduction would obviously be a negative outcome for any producer especially considering we did not see any significant differences in cannabinoid or terpenoid content...

I’m not sure I’ve put forward any theories other than questioning the total yield/cannabinoid efficacy of supplemental FR light in the presence of a “broader” spectrum of white light. What I should have said, is “I’m fairly familiar with the general concept of the Emerson Enhancement Effect”…...

But Nichia did actually state what diode they were using in those trials you had linked. They put the “conventional LED” 5000k (Ra>80CRI) on the spectral graph next to the Hortisolis chip to so that the reader has a visual understanding of the differences between the spectrum used in their...

This was the study regarding the addition of monochromatic light to white light It looks like they did produce well for you. I’d imagine the results could even be better with some of the other more modern chips mentioned on the “cool end”, and also expanding more into the DR/FR regions. Maybe...

From my many hours of spectrum hunting, reading through data sheets, I have come across a couple of white LED’s that fairly effectively cover the cyan region. Yuji Led APS 3030 5000K Yuji LED APS 5600K Bridgelux Thrive 2835 5700K (Dark Blue Line) Seoul Sun Some of thes options wouldn’t...

I was more or less calling out the study for how it was posited; and therefore any conclusions that could be deduced about how they applied to growing cannabis. Or overall spectrum performance in general relating to high ppfd conditions. I don’t think one can judge how a light will perform...

I did note that you had mentioned it, which was kind of the point I was trying to make. The study cited is fairly disingenuous when comparing those two types of LED chips and expecting to get meaningful interpretations of how spectrum can effect photosynthesis and yield, considering one of the...

I’m not sure what secret you’re referring to, but I believe the proportions of Blue to Red photons as well as covering the red end of chlorophyll a, are why the plants in that study you cited did better under the Hortisolis chips vs the 5000k 80CRI chips. Not just the additional red nanometers...

I run (2) Spydr 2i fixtures (42” x 47”) in a 4’ x 8’ tent. They do really well and plants love them. The smaller fixture will do a 4x4 just fine at max output. For the price, it’s a steal. Don’t sweat the lack of UV/FR/IR as the plants grow dank weed just fine without, and most growers wouldn’t...

I would like to see more people growing under more Sun-like LED’s (most of them are <95-99CRI) like Bridgelux Thrive, Yuji high CRI, or Seoul Sunlike LEDs. I’d love to see similar light recipes (ex. 3000/5000, 3500 +660nm) between the 80CRI higher efficiency chips vs 98CRI lower efficiency...

It sounds like your environment is within a safe range, but possibly too much light too soon/potentially overwatered. If your plants are not drinking like they should, they may possibly have gotten stressed from too much light too early, or getting overwatered, or a combination of the two. This...

What are your environmental conditions? Leaf Temp? RH? Lux/PPFD? How young are these plants? Number of nodes? Size of pot/container? Are the plants drinking what you give them, or is the media staying moist longer than you’re used to? Your EC sounds just fine depending the size of the plants...

A fun and easy read about Far Red from Fluence… https://fluence-led.com/science-articles/far-red-introduction-and-yield/

I don’t know man, grow environments are pretty dynamic so I just try to keep all the parameters in check. Also, like I said in my previous post, the average intensity my buds saw was not 1500-1700ppfd. Probably more like 1100-1350ppfd. Plants outside grow under 2300 ppfd with about 400 ppm of...

So to preface all of your questions, I’d like to give a little context as to the growing conditions I went through, which was by happenstance, not by design. I run a sealed closed loop 4’ x 8’ tent with A/C, Dehu, and CO2 tank injection and 10 mini fans. I measure light levels with a Apogee...

I have reservations about spectrums with these massive red spikes relative to the other colors. I’m currently using the R4 spectrum from Fluence and was able to run long and short flowering plants at 1500-1700 ppfd (Edit: without CO2 supplement) without stress or issue and the yield and quality...

I run (2) SPYDR 2i fixtures which are almost the same fixture just with a different power supply (120v -277v). Same spectrum just slightly higher efficacy. Just an older model that cost me more than double the new price on the Fang series :roll:. I enjoy their performance though, they have...