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LED street lights are used in urban night lighting

Author : Shenzhen Crown Lighting

Update time : 2021-08-07 17:00:46

LED street lights are used in urban night lighting

Roadway luminary can be used for night scene lighting. Nightscape lighting, in addition to functional lighting, targeted to beautify the human landscape at night. There are many kinds of light sources. When choosing a light source, we should mainly consider the effect, performance and cost. When comparing the cost of different lighting solutions, it is not only to compare the price of the light source, but also to conduct a comprehensive economic analysis of the whole life cycle to compare the price of solar street lights and the picture. However, it is economically and technically reasonable to reduce the number of use and operation and maintenance costs.

The traditional light sources used in night scene lighting, such as incandescent lamps and halogen lamps. When they are lit and have good color rendering properties. However, their luminous efficiency is low and their lifespan is relatively short, so they are rarely used again. Currently commonly used light is flood lighting, which refers to a lighting method that makes the brightness of a specific lighting area or a specific visual target much higher than other targets and surrounding areas.The light source is high air pressure, which refers to a place where the air pressure is higher than the surrounding air pressure. The place with the highest air pressure is called the "high air pressure center". Discharge lamps, such as high-pressure mercury lamps, high-pressure sodium lamps, and metal halide lamps Metal halide lamps work on AC power sources and produce arc discharges in the mixed vapor of mercury and rare metal halide lamps. Metal halide lamps are the third-generation light source made by adding various metal halides on the basis of high-pressure mercury lamps.These light sources have high power and can achieve large-area floodlighting. However, the common disadvantage of these light sources is that the lamp needs a period of time to work stably after being turned on. Moreover, if the lamp is accidentally extinguished, it needs to wait until the lamp tube is sufficiently cooled before restarting. In addition, these lights are not easy to achieve dynamic effects such as light color changes. Although color filters can also be used to achieve light color changes, this will greatly affect the system efficiency.

As an emerging force in light sources, the way LEDs emit light is completely different from traditional light sources. It uses the recombination of electrons and holes in the semiconductor PN node to emit light. The difference in light-emitting mode determines the essential difference between LED and traditional light sources, and also determines that it has its own unique characteristics.

First of all, the LED is small in size. A single high-power LED refers to a light-emitting diode with a large rated working power. The size of the chip is generally only 1 square millimeter, plus the outer packaging material, the diameter of an LED is usually only a few millimeters, and the multi-chip mixed light LED is slightly larger due to the integration of multiple LED chips. This brings a high degree of flexibility in the appearance design of the lighting fixtures. The LED lamps can be made into point, linear or surface light sources according to the needs, and the size of the LED lamps can also be customized according to the characteristics of the building structure. Good realization of the effect of seeing the light but not the light. More and more modern buildings use new materials such as glass exterior walls, which makes the traditional external lighting method gradually replaced by internal transparent lighting, and LED is an excellent choice for internal transparent lighting. Helps reduce light interference and light pollution problems.
　　
Second, LED has rich colors and good monochromaticity of the emitted light. The monochromaticity of the light emitted by the monochromatic LED is better, which is determined by the light-emitting principle of the LED chip. Using different luminescent materials, you can get different colors of monochromatic light. In addition, on the basis of the blue chip, cooperate with With yellow phosphors, white LEDs with different color temperatures can be obtained, or by encapsulating three monochromatic LED chips of red, green, and blue into one LED, the corresponding optical design can be used to achieve the mixing of three-color light.

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