superbak3d
Well-Known Member
you hate blurple because green spectrum is barely used by cannabis plants?
You only see it as white because of the green.
DUET 2400 (LED FIXTURE) - UP TO 2400 WATTS (Flip Chip Opto)
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You only see it as white because of the green.
hillbill
Well-Known Member
Light is not composed of a few extreme spikes. Green may not be as efficient as blues and reds for photosynthesis, but many other functions need other colors and green may aid penetration through leaves.
Notice the wide spectrum provided by quality cobs, also the sun. I Used old retrofit cmh with plenty of green and they did well. Light consisting of just a few spectral spikes is just not the best for our favorite plants.
Damn, l still hate blurple. Been there, done that.
Notice the wide spectrum provided by quality cobs, also the sun. I Used old retrofit cmh with plenty of green and they did well. Light consisting of just a few spectral spikes is just not the best for our favorite plants.
Damn, l still hate blurple. Been there, done that.
superbak3d
Well-Known Member
No, light is composed of RGB. When all 3 are present, human eyes perceive that as "white".
Plants don't have eyes.
Saying you "hate blurple" is really you just saying you hate science and biology. The blurple is for the plants, not YOU. Just because your eyes don't enjoy the sight of RB with no G, doesn't take away from the fact that plants are the opposite, and they love it.
Sorry, but green has little to no effect on cannabis plants. This is backed up by decades worth of science.
Get over your blurple hate, it makes you look stupid.
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frica
Well-Known Member
http://ntrs.nasa.gov/search.jsp?R=20150009399
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20150009399.pdf
Green light.
Green light (500-600nm) falls between broad-band blue and red light
along the PAR energy spectrum. Green often is disregarded as an unimportant
waveband in photosynthesis because absorption spectra of extracted leaf chlorophyll
pigments indicate very weak absorption in the green region of the PAR. Because
chlorophyll has major absorption peaks only in the red and blue regions, researchers
initially selected first red, later blue, LEDs for first-generation LED arrays to support
plant growth. However, intact leaves do absorb considerable green light, and in a
relative quantum-efficiency curve for photosynthesis vs. PAR wavelengths, some
wavelengths of broad-band green actually are more efficient than certain
wavelengths of the blue band. Overall, however, broadband green is slightly less efficient than broadband blue. However, when leaf canopies close, red and blue light are absorbed strongly by upper or outer leaf layers, whereas green light penetrates to interior leaf layers, where it subsequently is absorbed and drives photosynthesis of the inner canopy (14). Thus, light sources containing some green can be more effective in stimulating crop growth than are red + blue sources alone,much as when
foliar canopies are closed. When applied together with blue light, green has effects
opposite to blue on stomatal aperture (15). Yet another useful feature of green light
is that the human eye perceives red + green + blue (RGB) light as white light, so if all
three wavebands are present simultaneously in plant-growth light, researchers and
growers are able to visually evaluate the stress status of crops, the incidence of
physiological disorders, and “true” leaf color (the way it looks outdoors), whereas if
only red + blue are present, green tissue looks purple, grey, or black, and
physiological stress or disease diagnosis is difficult(...)
Credit to Stardustsailor
I'm sure you know better than the most recent study published by NASA on plant lighting
Green is beneficial, and not just a little.
puffenuff
Well-Known Member
I'm excited to see something new and applaud the guys over at Flip Chip Opto. Although I'm more interested in the possibility of their white & red version being a reality, I'm still pleased to see them pushing the envelope with the red & blue.
Keep up the great work over there, Alex. Those lights look beastly. Haters gonna hate just keep doing what you guys are doing.
Keep up the great work over there, Alex. Those lights look beastly. Haters gonna hate just keep doing what you guys are doing.
hillbill
Well-Known Member
Plenty of red and blue in modern cobs. When phosphor results became predictable a few years ago, efficient white light LEDs began to appear. One big reason that awful blurple was even pursued was the inefficiency of white LEDs at the time.
There is a reason so many highly regarded members here are switching to cobs. They produce results. I had blurple lights (give you a deal) but seem to do better with white LEDs and cobs and still have some Cree diode a51 stuff with some added red diodes in some. They work well, l use them.
White cobs are not a religion, they just do a better job.
I hate blurple
There is a reason so many highly regarded members here are switching to cobs. They produce results. I had blurple lights (give you a deal) but seem to do better with white LEDs and cobs and still have some Cree diode a51 stuff with some added red diodes in some. They work well, l use them.
White cobs are not a religion, they just do a better job.
I hate blurple
sorry but you ought to check your facts before you say anything, it makes you look even stupider.
green wavelengths (500-600nm) are used by cannabis, and while slightly less efficient than blue or red are highly effective at driving photosynthesis.
superbak3d
Well-Known Member
Show me a grow journal here where members are specifically adding in green spectrum lighting to boost growth. I'll wait.
It's an overlooked spectrum for cannabis because it has minimal to no effects on it, more specifically DURING FLOWER. The NASA article is more about vegetative growth, not flowering.
Go look at any grow that uses a full spectrum bulb (4000k-5000k) and see how well it does in flower vs a 2700K bulb. It's a huge difference in growth and quality.
Full spectrum is good to use for veg stage as it best imitates a summer time sun, for flowering not so much.
speedyganga
Well-Known Member
Would someone juste say to this guy (superbak3d) to s.f.up with his science and go read a tiny bit of it... This thread is going to be interesting, go grow your babe with R:B and let the open minded people enjoy it.
I hate when I can't enjoy a thread because of some saying bs over and over, talking in the name of science when they can't even read a curve, an article or study some maths.
What you are discussing is over for 5years man... so seat, open your mind and learn !
I hate when I can't enjoy a thread because of some saying bs over and over, talking in the name of science when they can't even read a curve, an article or study some maths.
What you are discussing is over for 5years man... so seat, open your mind and learn !
frica
Well-Known Member
And 2700K is somehow not full spectrum because?
Also if you look at the light curve of the CXB3590 on the Cree datasheet you will see that 3000K actually has more green light than 5000K. And High CRI 3000K has the most green
http://www.cree.com/~/media/Files/Cree/LED-Components-and-Modules/XLamp/Data-and-Binning/ds-CXB3590.pdf
And people flower great with 4000K Veros which incidentally has more green than the 5000/3000K Veros
http://www.bridgelux.com/sites/default/files/resource_media/DS33 Vero 29 Array Data Sheet Rev J 20150908.pdf
Did you not look at the McCree graph that was posted just above ? HUH did you ?
actually red/blue is an interpretation of the chlorophyll A and B absorption curves and kind of ignores McCree..
hillbill
Well-Known Member
I own 1 green led diode which replaced a burnt blue diode. Plants do not disregard huge areas of energy which we may know as white light.
Philips 315 cdm has a good dose of green and even Amber and still seems to be an important step in HID development. Results are impressive.
Consider this. Shower your plants with all the blue and red watts possible with a/c or put them out in the full spectrum sun. Perfect light, perfect spectrum which is much more complete than a few spikes of 4 or so red and blue wavelengths. Imitating this light source is reasonable.
Growers stampeding to vero and Cree is subjective evidence but compelling, and these folks have been mostly thrilled with the results.
Be sure to back those blue diodes off. Remember "hash tips"?
Still hate blurple, damn it
Philips 315 cdm has a good dose of green and even Amber and still seems to be an important step in HID development. Results are impressive.
Consider this. Shower your plants with all the blue and red watts possible with a/c or put them out in the full spectrum sun. Perfect light, perfect spectrum which is much more complete than a few spikes of 4 or so red and blue wavelengths. Imitating this light source is reasonable.
Growers stampeding to vero and Cree is subjective evidence but compelling, and these folks have been mostly thrilled with the results.
Be sure to back those blue diodes off. Remember "hash tips"?
Still hate blurple, damn it
superbak3d
Well-Known Member
How cannabis absorbs light.
![0115161328a[1].jpg](/data/attachments/2685/2685998-b1a2593ec0fe59a539bbd671125d1141.jpg)
wrong chart , that is chlorophyll absorption for algae in a test tube. a very small piece of the whole pie.
puffenuff
Well-Known Member
Calm down guys. You're getting all worked up for nothing. It's like you can't allow anyone to have their own thoughts on the subject. All you're doing is ruining this thread with your comments. Let's just see some new LEDs be showcased and let the lights do the talking.