Solar street light pictures of $301

Traditional high pressure sodium lamp, road lamp often USES low light efficiency of high pressure sodium lamp faults causing the huge waste of energy, therefore, the development of new type high efficiency, energy saving, long life, high color rendering index of city lighting energy saving, environmental protection of the street lamp is of great importance to the

the traditional road lighting lamps and lanterns is often use high pressure sodium lamp, a disadvantage of low and high pressure sodium lamp lights caused a huge energy waste. Therefore, development of high efficiency, energy saving, long life, high color rendering index, a new type of street lamp lighting of city, environmental protection and energy saving is of great significance. As the led street lamp light source, leds have many advantages compared with traditional high pressure sodium lamp. First of all, the light emitting diode is a semiconductor diode, its long service life. When flux to 80%, its service life can reach 25000 hours. The life of the metal halide lamp is 6000 ~ 12000 hours, high pressure sodium lamp life 12000 hours. Led street lamp longer service life. Second, the basic structure of light emitting diode is an electroluminescent semiconductor materials, it is placed in a shelf with lead, and then sealed with epoxy resin, in order to protect the internal core, therefore leds have good seismic performance. Third, the color of white leds is better than high pressure sodium lamp. In middle level vision, the eye under the environment of high temperature than at low temperature environment is much easier to identify things. White light-emitting diodes (oleds) color performance is better than high pressure sodium lamp. High pressure sodium lamp color rendering index only 20 or so, and white LED color rendering index up to 65 ~ 80. The led street light has better color rendering performance. Fourth, leds can realize perfect dimming function. Due to the light emitting diode work scope is big, the light output is proportional to the current work, so can be dimmed by reducing current. In addition, due to the leds will not be damaged because of frequent switch, so the light-emitting diode dimming can be realized through pulse width adjustment, and by adjusting the voltage than empty and working frequency can effectively adjust the luminous intensity of leds. Led street light is more efficient and convenient. After reading the above introduction, compared with high pressure sodium lamp, led street lamp has many advantages, but there are limitations. Leds are not suitable for high-power lamps, because under the condition of high power lighting, led heat dissipation is not good, is better than the traditional high pressure sodium lamp. In addition, it's bad penetrability, use effect is better than yellow lamp high pressure sodium lamp in the fog.