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A grow light or plant light is an artificial light source, generally an electric light, designed to stimulate plant growth by emitting an electromagnetic spectrum appropriate for photosynthesis. Grow lights are used in applications where there is either no naturally occurring light, or where supplemental light is required. For example, in the winter months when the available hours of daylight may be insufficient for the desired plant growth, lights are used to extend the time the plants receive light. If plants do not receive enough light, they will grow long and spindly. Grow lights either attempt to provide a light spectrum similar to that of the sun, or to provide a spectrum that is more tailored to the needs of the plants being cultivated. Outdoor conditions are mimicked with varying colour, temperatures and spectral outputs from the grow light, as well as varying the lumen output (intensity) of the lamps. Depending on the type of plant being cultivated, the stage of cultivation (e.g., the germination/vegetative phase or the flowering/fruiting phase), and the photoperiod required by the plants, specific ranges of spectrum, luminous efficacy and colour temperature are desirable for use with specific plants and time periods. Russian botanist Andrei Famintsyn was the first to use artificial light for plant growing and research (1868). ==Typical usage== Grow lights are used for horticulture, indoor gardening, plant propagation and food production, including indoor hydroponics and aquatic plants. Although most grow lights are used on an industrial level, they can also be used in households. According to the inverse-square law, the intensity of light radiating from a point source (in this case a bulb) that reaches a surface is inversely proportional to the square of the surface's distance from the source (if an object is twice as far away, it receives only a quarter the light) which is a serious hurdle for indoor growers, and many techniques are employed to use light as efficiently as possible. Reflectors are thus often used in the lights to maximize light efficiency. Plants or lights are moved as close together as possible so that they receive equal lighting and that all light coming from the lights falls on the plants rather than on the surrounding area. A range of bulb types can be used as grow lights, such as incandescents, fluorescent lights, high-intensity discharge lamps (HID), and light-emitting diodes (LED). Today, the most widely used lights for professional use are HIDs and fluorescents, but recent advances in power efficiency and optimized light spectra show that high-powered LED systems can produce improved yields. Indoor flower and vegetable growers typically use high-pressure sodium (HPS/SON) and metal halide (MH) HID lights, but fluorescents and LEDs are replacing metal halides due to their efficiency and economy. Metal halide lights are regularly used for the first (or vegetative) phase of growth, as they emit larger amounts of blue and ultraviolet radiation.〔http://hortsci.ashspublications.org/content/30/2/374.full.pdf〕〔(Learning centre )〕 With the introduction of Ceramic Metal Halide lighting and full-spectrum Metal Halide lighting, they are increasingly being utilized as an exclusive source of light for both vegetative and reproductive growth stages. Blue spectrum light may trigger a greater vegetative response in plants.〔(Plant Growth Factors: Light )〕〔http://www.mv.helsinki.fi/aphalo/photobio/pdf/notes1.pdf〕〔(Phototropins Promote Plant Growth in Response to Blue Light in Low Light Environments )〕 High-pressure sodium lights are also used as a single source of light throughout the vegetative and reproductive stages. As well, they may be used as an amendment to full-spectrum lighting during the reproductive stage. Red spectrum light may trigger a greater flowering response in plants.〔http://hortsci.ashspublications.org/content/45/2/236.full.pdf〕 If high-pressure sodium lights are used for the vegetative phase, plants grow slightly more quickly, but will have longer internodes, and may be longer overall. In recent years LED technology has been introduced into the grow light market. By designing an indoor grow light using diodes, the exact wavelengths necessary for photosynthesis are used to create LED grow lights that are used for both the first (or vegetative) phase and the second (or reproductive) phase of growth. NASA has tested LED grow lights for their high efficiency in growing food in space for extraterrestrial colonization. Findings showed that plants benefit from the use of red, green and blue parts of the visible light spectrum.〔(Green-light Supplementation for Enhanced Lettuce Growth under Red- and Blue-light-emitting Diodes )〕〔(Green Light Drives Leaf Photosynthesis More Efficiently than Red Light in Strong White Light: Revisiting the Enigmatic Question of Why Leaves are Green )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Grow light」の詳細全文を読む スポンサード リンク
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