Since yellow has a similar wavelength to green they both show similar properties in plants. A source from NASA indicates that yellow light does not contribute to photosynthesis since the wavelength of the light is reflected by the plant and is not absorbed.
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Additionally, just like with green light, a study showed that when a plant was exposed to yellow light compared to blue and red, the growth of the plant tested was reduced. Exposure to red light is another crucial factor which contributes to the optimal development of a plant.
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A study which compared red light, blue light, and a mixture of both indicated that even though plants which grew under red light yielded more leaves than the ones grown under blue lights, the combination of both produced an amount of leaves which surpassed the plants who grew strictly under red light. A similar case occurred during the growth of wheat where the crop yielded far better results when grown under a mixture of red and blue light, compared to strictly red light.
Effect of Flashing Light on Plant Growth Rate
Even though little absorption occurs with this type of light, it plays an important role in plant germination and flowering. Red light and far red light go hand-in-hand in regards to the effects that they have on plants.
A regular plant has a phytochrome system a light detection system which regulates its growth, adjusting itself depending on the type of light that it is exposed to. In this system, there are two predominant forms of plant protein: its biologically inactive form Pr , and its biologically active form Pfr. Pfr is important because it triggers plant growth, but it slowly reverts back to Pr over time when the plant is located in the dark.
Influence of Light on Crop Growth
An example on how the Far Red light properties can be used to your advantage to have a higher yield is seen in cannabis growth. During the day, this plant exhibits the most flowering, and during the night it ripens. Being a short day plant, it normally requires 12 hours of exposure to light, and 12 hours of darkness. This way, flowering can occur under a longer daylight period, which in turn produces a greater yield.
Out of all the colors mentioned above, the most crucial ones in the development of your plant are red and blue.
Adding or removing the other light colors will vary the appearance and texture of the plant you are growing and will cause your plant to grow with the characteristics that you seek. At Grobo, we developed our own LED grow light technology for a proprietary blend of the wavelengths best suited for plant growth.
Additionally, through the use of the far red light we've incorporated, your plants produce a higher yield compared to being just grown under plain light. Chris Thiele. Chris is an electrical engineer and CTO at Grobo. Chris' goal is to make home growing simple and accessible to everyone.
I agree to subscribe to updates from Grobo -. Close menu. Chris Thiele March 10, What Exactly is Visible Light? The Effects of Each Color of Light.
Ultraviolet 20nm to nm. Violet nm to nm. Blue nm to nm. Green nm to nm.
Yellow nm to nm. Red nm to nm. Far Red nm to nm. So What is the Best Color for Plants? Related Articles. Where to Grow Cannabis in Europe. Aeroponics Vs. This page content is generated by GemPages. Blue LEDs have become very efficient and inexpensive because they are used to create white LEDs for human applications. Lighting , Production February Our perception of blue light, especially at shorter wavelengths for example, to nm is low compared to green light. Figure 1. Seedlings grown indoors with blue light are often shorter, and have smaller leaves, than those grown under only red light.
Plants were grown at the same photosynthetic photon flux density PPFD in an environmental growth chamber. Erik Runkle Erik Runkle is professor and floriculture extension specialist in the department of horticulture at Michigan State University.
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LED Lights for Plant Growth | Sciencing
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