4/11/2023 0 Comments Light spectrumWhen sunlight is a limiting factor in greenhouses (during the winter), supplemental lighting can accelerate rooting as well as produce more compact young plants. Extension growth is typically suppressed when the light intensity is moderately high, and by blue light. The light spectrum and intensity regulate extension growth and can act as a growth regulator. Whether growing in vertical farms or in greenhouses, growers strive to produce plugs and liners that have compact growth. This article discusses the effects of the light spectrum on plants, and conceptually how it can be used for different greenhouse and indoor crop production applications.Ĭompact growth during propagation. With light-emitting diodes (LEDs), the peak wavelengths are also important, since “blue light” and “red light” are rather generic and have a broad waveband range. These terms describe the relative quantities of different wavebands of light, such as blue light, red light and far-red light. That can create confusion for consumers, who simply have no way of knowing exactly what benefits, if any, they are receiving from full-spectrum lighting products.There are several terms used to describe the color, or spectral distribution of light, including light quality, spectral quality, light spectrum and photon spectrum. Problem is, lighting manufacturers generally come up with their own definition of full spectrum lighting, according to the Lighting Research Center. The LRC’s National Lighting Product Information Program (NLPIP) reviewed promotional claims for full spectrum light sources from various manufacturer and retailer websites, which revealed these top claimed benefits: So, exactly what benefits do consumers get for going with more expensive full spectrum lighting, which has less efficacy? Today, there are numerous lighting products marketed as full-spectrum light sources that simulate both the visible and ultraviolet spectrum of natural light. And, full-spectrum lamps also cost a premium over light sources not marketed as full-spectrum but have a nearly identical SPD. For instance, full-spectrum T12 fluorescent lamps have an efficacy of up to 40 percent lower than conventional triphosphor fluorescent lamps. Lighting sources marketed as full-spectrum are generally less efficient than conventional lamps. When choosing artificial lighting products for office or home, the marketing term “full-spectrum” implies the lighting product emulates natural light in a continuous spectral power distribution (SPD), which represents the radiant power of a light source as a function of wavelength, without the ups and downs in radiant energy associated with fluorescent and metal halide lamps. John Ott coined the term “full-spectrum lighting” to describe light sources emitting a full spectrum of natural light, which included both ultraviolet and visible light, and promoting the same health benefits of sunlight in humans, animals and plants. Visible light includes the spectrum of seven color bands produced when sunlight is refracted through a prism: red, orange, yellow, green, blue, indigo and violet.įor years, ever since the workforce largely migrated from farms to factories, the lighting industry sought to develop electric, artificial light sources that mimicked the properties of sunlight.įor years the lighting industry has sought to develop electric, artificial light sources that mimicked the properties of sunlight. Sunlight is described as full-spectrum light and includes the range of wavelengths necessary to sustain life on Earth: infrared, visible and ultraviolet (UV).īut the human eye only responds to the visible light component, which lies between infrared and ultraviolet radiation, and emits tiny wavelengths – just 400 to 700 nanometers (nanometer = billionth of a meter). The electromagnetic spectrum is the range of all frequencies, or wavelengths, of electromagnetic radiation – from very low energy frequencies like radio waves, to radiation with very high-energy frequencies such as gamma rays. It’s the part of the electromagnetic spectrum we call “visible light”. Light, as we humans see it, is electromagnetic radiation that’s visible to the human eye. Lighting spectrum – Natural and artificial lighting.
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