Far-red light is light at the extreme red end of the visible spectrum, just before infra-red light.
Usually regarded as the region between 710 and 850 nm wavelength, it is dimly visible to some organisms’ eyes.
Can humans see far red light?
It includes all the visible colors, plus some that humans can’t see. Plants use the blue and red wavelengths of light for photosynthesis. Light that has passed through or bounced off of leaves has lost much of its blue and red light and has relatively more green and far-red light.
What is the difference between red and far red light?
Phytochrome has an inactive (red light absorbing) and active form (far-red light absorbing), and it switches between the two forms based on the light conditions. The light conditions are often quantified by looking at the ratio of red light to far-red light (usually shortened to “R:FR”).
What does far red light do to plants?
The Phytochrome System and Growth
Any plant in the shade of another plant will be exposed to red-depleted, far-red-enriched light because the other plant has absorbed most of the other red light. The exposure to red light converts phytochrome in the shaded leaves to the Pr (inactive) form, which slows growth.
Is red light bad for plants?
The fact that leaves don’t usually appear blue or red means that they absorb those parts of the light spectrum and use them to grow. The effect of blue light on plants is directly related to chlorophyll production. Red light is responsible for making plants flower and produce fruit.
Photo in the article by “Flickr”