Open a street lamp light source and characteristics of commonly used solar street lamps

Commonly used main light source of fluorescent lamp, high-pressure sodium lamp, low voltage sodium lamp, metal halide lamp and so on. In recent years, with the successful development of high power LED new energy-saving light source, LED has caused wide public concern. Provide more green common fluorescent lamp, about 50%,

common 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 successful development of high power leds, new energy-saving light source led has caused wide public concern. Common fluorescent lamp to provide more green, accounts for about 50%, most of the rest is red and blue light, accounted for about 25% of the total spectrum, far-red ratio is very low. Fluorescent lamp high luminous efficiency, long service life ( About 12000 hours) , but low power ( At present commonly used is 28 w and 36 w) , need a lot of lights to meet certain intensity of illumination. Because it contains a lot of green light, easily lead to excessive growth of crops. At present, it is often used in plant tissue culture. Sodium is a kind of gas emitting light source, mercury and sodium vapor. It is divided into two types: low pressure sodium lamp and high pressure sodium lamp. Low pressure sodium lamp appears earlier, the sodium vapor pressure no more than a few palmer, its emission spectrum is concentrated in the 589 nm Huang Guangzhong, can only be used in combination with other light source. Luminous efficiency is as high as 200 mm/tile, long service life, About 9000 hours) 。 High pressure sodium lamp standard working sodium vapour pressure of about 10 kpa, there are more luminescent spectra of red and orange light and less blue-green light. High luminous efficiency, large power and long service life, About 12000 hours) , is widely used now. However, due to the high pressure sodium lamp is hot light source, the surface temperature is high, the calorific value is big, so can't close illuminate the crops. Metal halide lamp is a kind of gas emitting light source, through the mercury arc discharge and the mixture of rare metal halide vapor produced light. By changing the composition of metal halide can present different spectrum. High luminous efficiency, large power and long service life, 5000 hours to 20000 hours) 。 Light padding containing mercury, however, when using lamp damaged or discarded after failure, will pollute the environment. Spectrum contains more high calorific value far red, cannot close illuminate crops. Light emitting diode light source is developed in recent years a new type of energy-saving light source. With artificial light sources such as incandescent lamp, fluorescent lamp, high-pressure sodium lamp, light emitting diode has obvious advantages: middot dc low voltage power supply. Low power dc voltage is usually 1 color leds. 5 v - 2. 8 v, dc voltage in the power leds are usually 3 v - 4 v, is far lower than the safety voltage. Middot energy-saving. Sodium lamp and metal halide lamp is gas discharge lamp, metal elements released by heating steam to shine. Light-emitting diodes (leds) is a solid-state light source, may shine without heating. It is a cold light source, so it reduces the consumption in the process of heating power. Middot monochromatic light source, high luminous efficiency. Leds emit monochromatic light, the half wave width is mostly the plural; 20 nanometers, can accurately provide the required spectrum for plants, and won't waste to energy plants emit yellow, green and other unnecessary spectrum. Middot small volume, flexible application. Can design lamp light, thin and short, empty. Middot environmental protection. Light emitting diode is a kind of solid shine light source, contain no mercury and other harmful substances. Will not cause pollution in the process of installation and use, its wastes can be recycled. Led light source is a kind of green light source. Middot longevity. Light-emitting diodes (leds) for solid-state light source, no loose parts, without the vulnerability is easy to burn part such as glass, filament, high mechanical strength, resistance to vibration and impact resistance, service life can reach more than 50000 hours