Street lamp light source, what are the characteristics of the commonly used

The commonly used solar street lamps light source mainly include fluorescent lamp, high-pressure sodium lamp, low voltage sodium lamp, metal halide lamp and so on. In recent years, with the development of the high power LED, solar street lamp manufacturers of new energy-saving light source LED also caused wide public concern. Provide more green

common fluorescent lamp, about 50%, the rest are red, blue, and accounts for about 25% of the total spectrum respectively, far red spectral ratio is very low. Fluorescent lamp high luminous efficiency, long life, About 12000 h) , but the smaller power ( At present there are 28 w and 36 w two commonly used) , meet some light the lamps and lanterns. Because of contains a lot of green light, easy to cause crop moderate growth. Now commonly used in plant transformation.

sodium lamp is mercury and sodium vapor glowing gas emitting light source, can be divided into two kinds of low pressure sodium lamp and high pressure sodium lamp. Low pressure sodium lamp appears earlier, the sodium vapor pressure is not more than a few palmer, the luminescent spectrum is concentrated in the 589 nm light yellow, usually can only be used with other light source. Luminous efficiency is as high as 200 lm/W, long service life, About 9000 h) 。 High pressure sodium lamp sodium vapour pressure of about 10 kpa standard work, there are more luminescent spectra of red orange light and less blue green light. High luminous efficiency, big power, long life, About 12000 h) , is widely used now. But because of the high pressure sodium lamp is hot light source, the surface temperature is high, calorific value is bigger, can't close crop.

metal halide lamp is mercury and rare metal halide arc forming mixture vapor discharge light emitting a gas emitting light source. But by changing the metal halide component present different spectrum. Its high luminous efficiency, big power, long life, 5000h~20000h) 。 But there are mercury in the padding in the lamp, when using the lamp damage or failure to abandon, will damage to the environment. Spectrum contains more far red, calorific value is big, can't close crop.

　　LED( Light emitting diode) The light source is developed in recent years new energy-saving light source. With incandescent lamp, fluorescent lamp and high pressure sodium lamp compared to the artificial light source such as LED has significant advantages:

& middot; Dc low voltage power supply. Small power color LED forward voltage is usually 1. 5 v - 2. 8 v, high-power LED forward voltage is usually 3 v - 4 v, is far less than the safety voltage.

压力; Energy saving. Sodium lamp and metal halide lamp is gas discharge lamp, metallic elements by heating temperature steam discharge and shine. LED is a solid light source, do not need to heating can shine, is a kind of cold light source, thus reduced the cost on the heating power.

压力; Monochromatic light source, high luminous efficiency. Leds can launch monochromatic light, the half wave for more & plusmn; 20 nm, could precisely provide plants need spectrum, and not to waste electricity issued a yellow light, green plants do not need the spectrum.

压力; Small volume, flexible application. Can design the lamps and lanterns of the lightweight, application space is large.

压力; Environmental protection. LED is a solid light source, no mercury and other harmful substances, will not cause pollution, in install and use its wastes can be recycled. The LED light source is environmental protection of green light source.

压力; Life is long. LED is a solid light, inside there is no loose parts, no vulnerability and burn part such as glass, filament, mechanical strength, resistance to vibration and impact resistance, service life can reach more than 50000 h.

obvious advantage of LED light source has attracted the Netherlands, Japan, the United States and other countries the attention of scholars, especially in recent years, high power LED research and development success, has paved the way for the LED application in greenhouse fill light.