nachooo
Well-Known Member
Another recent study confirms that Far red need to be added to our lighting récipe
https://www.frontiersin.org/articles/10.3389/fpls.2019.00322/full
https://www.frontiersin.org/articles/10.3389/fpls.2019.00322/full
Noted. FR during lights on, not only at end-of-day. Good find!Another recent study confirms that Far red need to be added to our lighting récipe
https://www.frontiersin.org/articles/10.3389/fpls.2019.00322/full
Yes, and it seems , at least with tomato plants, that Red/Far red ratio can be higher than sunlight and still obtain benefits of far red. what I mean is that we dont need too much far red..so less problems with elongation. What we have to find is what Red/Far red ratio is the best in veg and flower conditions..and how to translate it to practical growers conditions…. I mean..how much Red is provided by our lamps…(different situations in every grower….diferent Kelvin..CRI etc...) and then add exactly the needed Far red in order to obtain the correct ratio. A light company can do it easily cause they have measuring tools and sometimes.. sharp minds….but for us...poor mortals…. the only way is guess and experiment….Noted. FR during lights on, not only at end-of-day. Good find!
I believe you are 100% on the correct path. The issue is that the wheels start coming off of the 'Efficiency" Bus when you start trying to widen the spectrum.Yes, and it seems , at least with tomato plants, that Red/Far red ratio can be higher than sunlight and still obtain benefits of far red. what I mean is that we dont need too much far red..so less problems with elongation. What we have to find is what Red/Far red ratio is the best in veg and flower conditions..and how to translate it to practical growers conditions…. I mean..how much Red is provided by our lamps…(different situations in every grower….diferent Kelvin..CRI etc...) and then add exactly the needed Far red in order to obtain the correct ratio. A light company can do it easily cause they have measuring tools and sometimes.. sharp minds….but for us...poor mortals…. the only way is guess and experiment….
This would be a good opportunity for you to flex some knowledge muscle.Different strains react differently n different ways when it comes to this. There is no correct answer, it causes some strains to stretch more than you would like but with others they seem to love it. Far red creates a shade response to make the plants want to stretch out, it also helps 660nm work better as per the Emerson effect. The ratio of 660nm and 730nm depends on what you are growing, only way to determine what works best is to have a tunable spectrum. I think 730nm works better when the spectrum is more balanced. 730nm can also be used in Veg stage too to control how much stretch you want.
Not exactly...seems that benefits for Far red addition are bigger when you are using a not balanced spectrum like Blue/red.led lamps. A wider and more balanced spectrum like a Warm White 3500 K has some far red in it and the benefit of adding far red is less. @Randomblame posted a very concise study that stated that… Anyway the benefits appear in the two optionsDifferent strains react differently n different ways when it comes to this. There is no correct answer, it causes some strains to stretch more than you would like but with others they seem to love it. Far red creates a shade response to make the plants want to stretch out, it also helps 660nm work better as per the Emerson effect. The ratio of 660nm and 730nm depends on what you are growing, only way to determine what works best is to have a tunable spectrum. I think 730nm works better when the spectrum is more balanced. 730nm can also be used in Veg stage too to control how much stretch you want.
I was thinking the same while was reading it...Well brother @nachooo , that article clearly highlights why many see more "praying" in led plants. It is clearly the results of a wonky spectrum
"Petiole angle (upper angle between petiole and stem) increased with decreasing PSS in both experiments, resulting in more horizontally oriented leaves at low PSS (Figure 1B). The EOD-FR treatment hardly affected the petiole angle. Decreasing PSS from 0.88 (0.87 in EXP2) to 0.80 increased the total leaf area per plant by approximately 3% (EXP1) and 21% (EXP2) (Figure 1C) but decreasing PSS below 0.80 had no further effect on total leaf area. The EOD-FR treatment did not increase total leaf area, compared with the other treatments without supplemental FR (PSS 0.88; Figure 1C). The area of individual fully grown leaves (Leaf number 2 and 3) showed comparable results to that of total leaf area, and leaf length increased with decreasing PSS in both experiments (Supplementary Table S3). The leaf mass per leaf area (LMA) was lower for the plants treated with additional FR or EOD-FR (Supplementary Table S4)."
Is not only the heat...it seems that affects stomata throught other mechanism...phytochrome changes..etc...Because 730nm or FR is starting to produce heat in a different way it will effect humidity and stomatal. There is definitely a link between stomatal and FR. If you look at a hps is has very high amounts of green that is responsible for stomatal, and high amounts of FR
Interesting read @trojanvirus -- and we were all told that green light was totally wasted. Here we find out that it provides penetration to the lower chloroplasts in smaller quantity more so than added red's or blue's once initial chloroplasts are filled / saturated. Am I understanding that right? So some green light is beneficial in very small amounts once you're on the higher watt / sq foot intensity side of the scale. Is that how you understand things?here's a read you might enjoy.
I understand that part, but then the question becomes "how much?". Am I right? It's all about dosing in quantities that matter. Not even quantities so much as ratios once we assume enough quantity. That's what I'm trying to understand. I get that red light is prioritized, then blues/white light, with green light being last once the first two are satisfied first.Without green light the plants can only absorb so many photons is my understanding, plants need full spectrum to absorb the peak spectrums properly.