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Commonly used light sources are fluorescent lamps, high pressure sodium lamps, low pressure sodium lamps, metal halide lamps, etc. In recent years, with the successful development of high-power LEDs, new energy-saving light source LEDs have also attracted widespread attention. Ordinary fluorescent lamps provide more green light, about 50%, and the rest are mostly red and blue light, which account for about 25% of the total spectrum, and the far-red spectrum has a very low proportion. Fluorescent lamps have high luminous efficiency and long life (about 12000h), but their power is small (currently there are two types of 28W and 36W), and many lamps are required to meet a certain illuminance. Because it contains a lot of green light, it is easy to cause leggy crops. Currently commonly used in plant tissue culture. Sodium lamp is a gas light source that emits light from mercury and sodium vapor. It is divided into two types: low pressure sodium lamp and high pressure sodium lamp. Low-pressure sodium lamps appeared earlier, the sodium vapor pressure does not exceed a few Pa, and its emission spectrum is concentrated in the yellow light of 589nm, which can usually only be used in conjunction with other light sources. The luminous efficiency is as high as 200lm/W, and the lifespan is long (about 9000h). The standard working sodium vapor pressure of the high-pressure sodium lamp is about 10kPa, and there are more red-orange light and less blue-green light in the luminous spectrum. It has high luminous efficiency, high power and long life (about 12000h), and is currently used more. However, because the high-pressure sodium lamp is a heat source, the surface temperature is high, and the calorific value is large, so it cannot irradiate crops at close range. A metal halide lamp is a gas luminous light source that generates an arc by the mixed vapor of mercury and a halide of a rare metal to discharge and emit light. Different spectra can be presented by changing the metal halide composition. It has high luminous efficiency, high power and long life (5000h~20000h). However, the filling in the lamp contains mercury, which will pollute the environment when the used lamp is broken or discarded after failure. The spectrum contains more far-red light, which generates a large amount of heat and cannot irradiate crops at close range. LED (Light Emitting Diode) light source is a new type of energy-saving light source developed in recent years. Compared with artificial light sources such as incandescent, fluorescent and high-pressure sodium lamps, LEDs have significant advantages: DC low-voltage power supply. The forward voltage of low-power color LEDs is usually 1.5V-2.8V, and the forward voltage of high-power LEDs is usually 3V-4V, which is much smaller than the safe voltage. ·Energy saving. Sodium lamps and metal halide lamps are gas discharge lamps, which emit light by heating and heating to discharge metal element vapors. LED is a solid-state light source that emits light without heating. It is a cold light source, so it reduces the power consumption for heating. ·Monochromatic light source, high luminous efficiency. The LED can emit monochromatic light, and its half-wave width is mostly ±20nm, which can accurately provide the required spectrum for plants without wasting electric energy to emit yellow light, green light and other unnecessary spectra for plants. ·Small size and flexible application. Lightweight and short lamps can be designed, and the application space is large. ·Environmental friendly. LED is a solid light source, does not contain mercury and other harmful substances, will not cause pollution during installation and use, and its waste can also be recycled. LED light source is an environmentally friendly green light source. ·long life. LED is a solid light source, there are no loose parts inside, no glass, filament and other fragile and easy-to-burn parts, high mechanical strength, vibration resistance, impact resistance, and a lifespan of more than 50,000h. The obvious advantages of LED light sources have attracted the attention of scholars in the Netherlands, Japan, the United States and other countries. Especially in recent years, the successful research and development of high-power LEDs has laid a foundation for LED lighting applications in greenhouses. solar street light,solar street light manufacturer,high pole light,high pole light manufacturer,street light,street light manufacturer,street light,street light manufacturer,led street light,led street light manufacturer,street light pole,street light pole manufacturer,landscape light,landscape light manufacturer , Magnolia lanterns, Magnolia lanterns manufacturers, minority street lights Yangzhou Global Solar Technology Development Co., Ltd. is a manufacturer engaged in the production of outdoor road lighting, the main products are city circuit lights, solar street lights, high pole lights, led street lights, all kinds of special-shaped Landscape lights, magnolia lights, Chinese lights, street lights with ethnic characteristics, etc., welcome to visit our factory and consult and discuss business cooperation
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