LED street lamp will take the throne in urban lighting

Lamps are an important part of urban lighting. Traditional street lamps often use high-pressure sodium lamps. The disadvantages of high-pressure sodium lamps as a whole have low energy efficiency and cause huge waste of energy. Therefore, the development of new types of high efficiency, energy saving, long life, high color rendering index, and environmental protection The street lights have a very important significance for energy saving in urban lighting. As a light source for street lamps, LEDs have many advantages over traditional street light sources.

First, the LED is a semiconductor diode and its lifetime is very long. When the luminous flux decays to 80%, its lifetime reaches 25,000 hours. The lifetime of metal halide lamps ranges from 6000 to 12,000 hours, and the lifetime of high-pressure sodium lamps is 12,000 hours.

Second, the basic structure of the LED is an electroluminescent semiconductor material, placed on a leaded shelf, and then sealed with epoxy resin around to protect the internal core, so the LED's seismic performance is good.

Third, the light color of the white LED is better than that of the high pressure sodium lamp. At the intermediate vision level, the human eye is more likely to distinguish things in a high color temperature environment than a low color temperature environment. The color rendering of the white LED is also much better than that of the high pressure sodium lamp. The color rendering index of the high pressure sodium lamp is only 20 right and left, and the white LED can reach 65 to 80.

Fourth, LED can achieve a more perfect dimming function. Due to the large operating range of the LED, its light output is proportional to the operating current, so the current can be reduced by dimming the current. In addition, due to the frequent switching of the LED does not have much damage to it, the dimming of the LED can also be obtained by a pulse width adjustment method, and the luminous intensity of the LED can be effectively adjusted by adjusting the duty cycle and the operating frequency of the voltage.

Fifth, in the optical system of the luminaire, the luminous flux of the LED light source is minimal. Unlike traditional light sources, LEDs are half-space light sources. A high-pressure sodium lamp or a metal halide lamp is a full-space luminous light source, and it is necessary to change the direction of the outgoing light of one half space to 180 degrees in the other half. When we rely on reflectors, the absorption of light by the reflector and the light blocking of the light source itself are unavoidable. The use of LEDs as a light source does not present a loss in this respect, and the utilization of light is higher than that of conventional light sources. Finally, LED light sources do not contain harmful metallic mercury, unlike high-pressure sodium or metal halide lamps that cause environmental harm when scrapped.

At present, the initial investment in LED lighting is still a major problem that plagues us. LED light efficiency in the market is rapidly increasing, while the price is decreasing. Compared with environmental protection and energy saving of LED, conventional fossil energy is becoming increasingly tense, and it will cause increasingly serious pollution to the environment after use. Therefore, LED lighting as an emerging outdoor lighting, will show us endless vitality and broad prospects.