Effect of Light Wavelength on Rate of Photosynthesis
Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide.
Effects of Colored Light on Plants - 693 Words | Bartleby
ANY fluorescent light used for aquarium applications such as planted aquariums or reef, slowly burns up phosphors and other rare earth elements that produce the light energy necessary for PUR.
As with a UVC bulb/lamp used for a UV Sterilizer, these lights go through a "half life", meaning that a light that is run 12 hours per day that may last 2 years (as per rated life) should be actually replaced every year otherwise these lamps are running at 50% and less of initial light energy production and then often producing much more yellow light and even an imbalance of red that is inducing to more algae and cyanobacteria growth in particular.
The picture to above/left clearly demonstrates the difference we can see with just our human eye between new 6400K Daylight SHO and one nearly two years old.
The color temperature of the old lamp/light.
PAR is the abbreviation for Photosynthetically Active Radiation which is the spectral range of solar light from 400 to 700 nanometers that is generally accepted as needed by plants & symbiotic zooanthellic algae for photosynthesis (Zooxanthellae are single-celled algae that live in the tissues of animals such as corals, clams, & anemones).
It is also noteworthy that while outside of the accepted PAR, a study using infrared (IR) LEDs of 880 nm & 935 nm on etiolated oat seedlings showed leaf emergence, so these parameters may someday need better defining (See at the end of article).
30/12/2016 · Effects of Colored Light on Plants; ..
All oxygenic photosynthetic organisms use chlorophyll a, but differ in accessory pigments like chlorophyll b (chl b) .The contents of chlorophyll a were higher than chlorophyll b in both CK and LED light treatments.
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It is also noteworthy that many "terrestrial plant lights" as well as many aquarium plant lights (often of lower in kelvin temperature) have more "red nanometer spikes" than higher kelvin 6500k, 10,000k & higher lamps.
The problem with these lights is that while all plants utilizing photosynthesis require the same essential ABCs of PAR (see the PAR section), the facts of light energy penetrating water requires higher kelvin (6500k +) be added to provide maximum PUR (see Useful light energy/PUR section). Aquatic Plants and corals have adapted/evolved to the natural light energy at certain depth of water and the misguided attempt to adapt these terrestrial plant lights is not going to be 100% effective as a light with more water penetrating blue & slightly lower red nm energy.
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Most photosynthetic marine invertebrates should be kept with lamps of a daylight Kelvin temperature from 6400-14,000 K (higher Kelvin with deeper specimen placement, not necessarily tank depth). 20,000K daylight lamps can also be used for deeper tanks (over 22 inches) and/or supplementation with more blue lights (400nm- 490nm).
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Light plays a crucial role in different functions in the plants especially in matters that relate to the plants’ genes. The [Rbup2case] also written as RbcS, depends on the unison of the large subunits and the small subunits to be able to take in enough C02 to cater for the plant’s needs. These subunits largely depend on light emissions to carry out their functions at a faster rate than plants that thrive in dark places. Plants in areas with good lighting system grow rapidly and in a healthy manner due to the increase of the mRNA strand’s activities. Light that go beyond the optimum range that these genes require denature the cells or leads to no activity at all.