Many people are familiar with the different colors of the light spectrum that are optimal for growing during the different stages of plant development. In an earlier blog entry, I discussed how white light was optimal for seed and clone development, violet/blue light (400-500nm) was vital for the vegetation stage, and orange/red light (600-700nm) was vital for the flowering stage.
Many of the spectrum wavelength ranges I mention above are visible to the human eye, but plants require wavelengths above and below the visual spectrum of light that includes ultraviolet (<400nm) and far-red/infrared (>700nm).
Sunlight is electromagnetic radiation, which includes the visible light spectrum, infrared and ultraviolet light. Ultraviolet (UV) light has a shorter wavelength of less than 400nm compared to visible light.
The surface of a plant has photoreceptors that can feel the quantity and quality of light they are being exposed to. When the hotoreceptors sense the presence of UV, the plant produces photomorphogenic responses to the presence of UV radiation. These protective responses include increased production of essential oils and resins. Trichomes are a fine coating of resin glands produced as sunscreen to protect plants from UV radiation.
When plants are exposed to UV, the resin and trichome formation increase. Balance is the key to effective UV use. Using too much or incorrect ratios can harm your plants. However, having a perfect balance will give growers some incredible and useful results.
Did you know that roughly 49.4% of the light that reaches the surface of the earth is what we call infrared (IR) light, or heat radiation?
You see, visible light actually accounts for less than half of the Sun’s radiation. In addition to the wavelengths of light that people are able to see, the Sun also emits light wavelengths that are too short or too long for humans to see, yet we can still feel them. That's IR light.
Infrared light is part of the electromagnetic radiation spectrum, where wavelengths are longer than those of visible light. Typically, IR wavelengths range from 700 nanometers to 1 micrometer. These longer wavelengths are one of the main ways that heat is able to be transferred from one source to another. Longer wavelengths of infrared light produce more heat.
In the same way that the Sun is able to emit infrared light that outdoor plants can receive, LED grow lights can also provide IR light for indoor plants. Some growers hesitate to use this light because they believe the heat it provides will harm their plants, but that’s not necessarily true. That’s because grow lights are able to provide the right infrared wavelengths that actually trigger plant growth and aid in photosynthesis.
LEDs are made up of several diodes, some of which are capable of producing IR light. Most LEDs typically only produce visible light like blue and red wavelengths. So in order to emit infrared light, growers need to add infrared emitting diodes.
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Ok, that's all for our topic today. If you are also interested in other grow equipments, welcome to visit our website: ecofarm.ca
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