![]() ![]() ![]() Individual LEDs usually provide only a single narrow range of colors, and so different color LEDs are mixed in grow lights in proportions depending on the intended use. Most or all LEDs use AC/DC or DC/DC power supplies that provide constant direct current through the LEDs, regulating the amount of total power the LEDs can draw and preventing their failure. LED grow lights are usually composed of multiple individual light-emitting diodes in a casing with a heat sink and built-in fans. LED lights produce the highest photosynthetically active radiation (PAR) of any light. LED light is regarded as the fourth generation of light sources. Two plants growing under a magenta (red + blue) LED grow light Common types by generation Fourth generation: Light emitting diodes (LEDs) ![]() Findings showed that plants are affected by light in the red, green and blue parts of the visible light spectrum. NASA has tested LED grow lights for their high efficiency in growing food in space for extraterrestrial colonization. By designing an indoor grow light using diodes, specific wavelengths of light can be produced. In recent years LED technology has been introduced into the grow light market. 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. Red spectrum light may trigger a greater flowering response in plants. As well, they may be used as an amendment to full-spectrum lighting during the reproductive stage. High-pressure sodium lights are also used as a single source of light throughout the vegetative and reproductive stages. Blue spectrum light may trigger a greater vegetative response in plants. 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. Metal halide lights are regularly used for the vegetative phase of plant growth, as they emit larger amounts of blue and ultraviolet radiation. 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. Today, the most widely used lights for professional use are HIDs and fluorescents. The setup includes a carbon filter to remove odors, and ducting to exhaust hot air using a powerful exhaust fan.Ī 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). 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.Įxample of an HPS grow light set up in a grow tent. Reflectors are thus often used in the lights to maximize light efficiency. Īccording 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. Although most grow lights are used on an industrial level, they can also be used in households. Grow lights are used for horticulture, indoor gardening, plant propagation and food production, including indoor hydroponics and aquatic plants. the germination/vegetative phase or the flowering/fruiting phase), and the photoperiod required by the plants, specific ranges of spectrum, luminous efficacy and color temperature are desirable for use with specific plants and time periods. Depending on the type of plant being cultivated, the stage of cultivation (e.g. Outdoor conditions are mimicked with varying colour temperatures and spectral outputs from the grow light, as well as varying the intensity of the lamps. 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 (typically a varying combination of red and blue light, which generally appears pink to purple to the human eye). Ficus plant grown under a white LED grow light.Ī grow light is an electric light to help plants grow. ![]()
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