GrowLightResearch
Well-Known Member
I am going to try using Yellow with Blue rather than a cool white CCT from seed to flower.
I will use the blue yellow for a week or two then switch to a 3000K warn light source, specifically 16 Bridgelux BXEB-L0560Z-30E2000-C-B3 Linear Strips.
My question is: Has anyone here tried using Yellow and Blue to germinate seedlings?
Background:
Research is clear that blue light will mediate a reduction in elongation of the hypocotyledonous stem.
Research also shows that blue yellow wavelengths provide phytochrome R:fr ratio.
The following is from a well respected graduate level book titled Plant Physiology, 5th ed., Lincoln Taiz, & Zeiger
I will be using a horticulture research grow light fixture with 7 channels of three LEDs with 1000 levels of dimming. Each channel can be populated with any wavelength of LEDs. This experiment will be using OSRAM Olson SSL80 455nm deep blue and 589nm yellow.
The proposed BY ratio is 1:5 depending upon whether anyone here has a better idea.
Elongation will be measured with a Celestron 5 MP Handheld Digital Microscope.
PPFD will be measured with a StellarNet Blue Wave spectrometer.
This experiment will be done in conjunction with another experiment that is seeking to find a very low power methodology to maximize yield and minimize electrical consumption using the Bridgelux BXEB-L0560Z-30E2000-C-B3 Linear Strips.
I am currently posting the power consumption experiment and will provide a link in the next hour or so.
I will use the blue yellow for a week or two then switch to a 3000K warn light source, specifically 16 Bridgelux BXEB-L0560Z-30E2000-C-B3 Linear Strips.
My question is: Has anyone here tried using Yellow and Blue to germinate seedlings?
Background:
Research is clear that blue light will mediate a reduction in elongation of the hypocotyledonous stem.
Research also shows that blue yellow wavelengths provide phytochrome R:fr ratio.
The following is from a well respected graduate level book titled Plant Physiology, 5th ed., Lincoln Taiz, & Zeiger
The stems of seedlings growing in the dark elongate very rapidly, and the inhibition of stem elongation by light is a key morphogenetic response of the seedling emerging from the soil surface. The conversion of Pr to Pfr (the red- and far red–absorbing forms of phytochrome, respectively) in etiolated seedlings causes a phytochrome-dependent, sharp decrease in elongation rates.
However, action spectra for the decrease in elongation blue region, which cannotrate show strong activity in the be explained by the absorption properties of phytochrome In fact, the 400 to 500 nm blue region of the action spectrum for the inhibition of stem elongation closely resembles that of phototropism.
There are several ways to experimentally separate a reduction in elongation rates mediated by phytochrome from a reduction mediated by a specific blue-light response.
If lettuce seedlings are given low fluence rates of blue light under a strong background of yellow light, their hypocotyl elongation rate is reduced by more than 50%. The back-ground yellow light establishes a well-defined Pr
fr ratio. In such conditions, the low fluence rates.
However, action spectra for the decrease in elongation blue region, which cannotrate show strong activity in the be explained by the absorption properties of phytochrome In fact, the 400 to 500 nm blue region of the action spectrum for the inhibition of stem elongation closely resembles that of phototropism.
There are several ways to experimentally separate a reduction in elongation rates mediated by phytochrome from a reduction mediated by a specific blue-light response.
If lettuce seedlings are given low fluence rates of blue light under a strong background of yellow light, their hypocotyl elongation rate is reduced by more than 50%. The back-ground yellow light establishes a well-defined Pr
fr ratio. In such conditions, the low fluence rates. I will be using a horticulture research grow light fixture with 7 channels of three LEDs with 1000 levels of dimming. Each channel can be populated with any wavelength of LEDs. This experiment will be using OSRAM Olson SSL80 455nm deep blue and 589nm yellow.
The proposed BY ratio is 1:5 depending upon whether anyone here has a better idea.
Elongation will be measured with a Celestron 5 MP Handheld Digital Microscope.
PPFD will be measured with a StellarNet Blue Wave spectrometer.
This experiment will be done in conjunction with another experiment that is seeking to find a very low power methodology to maximize yield and minimize electrical consumption using the Bridgelux BXEB-L0560Z-30E2000-C-B3 Linear Strips.
I am currently posting the power consumption experiment and will provide a link in the next hour or so.
