There are many kinds of light sources that can be used for night illumination. When choosing a light source, we should mainly consider the effects, performance and cost. When comparing the cost of different solutions, not only the price of the light source is compared, but also the comprehensive economic analysis of the whole life period. Because some high-efficiency, long-life light sources, although the price is higher, the number of uses is reduced, and the operation and maintenance costs are reduced. Economically and technically reasonable.
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The traditional light sources used in night lighting, such as incandescent lamps and halogen lamps, are bright and bright, and have good color rendering; however, they have low luminous efficiency and relatively short life, so they are rarely used again. At present, the commonly used floodlight illumination sources are high-pressure discharge lamps, such as high-pressure mercury lamps, high-pressure sodium lamps and metal halide lamps, which have large power and can realize large-area floodlighting. However, the common disadvantage of these sources is that it takes a while for the lamp to stabilize after it has been illuminated; moreover, if the lamp is accidentally extinguished, it needs to wait for the lamp to cool sufficiently before it can be restarted. In addition, these lamps are not easy to achieve dynamic effects such as light color change, although the color change can be achieved if a color filter is used, but this will greatly affect the system efficiency.
As an emerging force in light sources, led lighting is very different from traditional light sources. It uses the recombination of electrons and holes in the semiconductor PN section to emit light. The difference in the way of illuminating determines the essential difference between LED and traditional light source, and also determines its own uniqueness.
First of all, the LED is small in size. The size of a single high-power LED chip is generally only 1 square millimeter. With the outer packaging material, the diameter of one LED is usually only a few millimeters. The multi-chip mixed LED has integrated multiple LED chips. The size is slightly larger. This brings great flexibility in the design of the lighting fixtures. LED lamps can be made into point, line or surface light sources according to their needs. The size of the lamps can also be customized according to the characteristics of the building structure. A good realization sees the effect of not seeing the light. Modern buildings are increasingly adopting new materials such as glass exterior walls, which makes the traditional external projection lighting mode gradually replaced by internal light transmission, and LED is an excellent choice for internal light transmission. Helps reduce light and light pollution problems.
Second, the LEDs are rich in color and the monochromaticity of the emitted light is good. The monochromaticity of the light emitted by the monochromatic LED is better, which is determined by the principle of illumination of the LED chip. Different luminescent materials can be used to obtain monochromatic light of different colors. In addition, on the basis of the blue chip, Yellow light phosphors can be used to obtain white LEDs with different color temperatures, or by encapsulating three monochromatic LED chips of red, green and blue into one LED, and using the corresponding optical design to achieve three-color light mixing.
Third, the LED has a long life and a fast response, and can be repeatedly switched. The life of high-power LEDs can reach more than 50,000 hours under normal working conditions, and the LEDs respond quickly. In addition, we can repeatedly switch the LEDs without adversely affecting their life or performance. This is very different from traditional light sources. If the ordinary incandescent lamp is repeatedly switched, its life will drop very quickly; for ordinary fluorescent lamps, each switch will cause loss of the electrode emitting material, so frequent switching will also cause the life of the lamp to drop rapidly. For high-pressure gas discharge lamps, repeated switching also has a very adverse effect on the electrodes of the lamp. Moreover, this type of light source cannot achieve a hot start, that is, after the lamp is extinguished after a certain period of time, it can be started again. . Therefore, for some lighting effects that require repeated switching operations, LEDs have a unique advantage.
Fourth, LEDs can achieve rapid and diverse changes in light color. As described above, the red, green, and blue monochromatic LED chips are packaged together, and the emitted three colors of light are mixed to obtain white light. If we control the three chips of red, green and blue separately, we can change the proportion of the three colors of light in the output light, thus realizing the change of the output color of the whole LED. In this way, an LED is like a palette, and different colors of light can be prepared according to different needs, which is impossible for traditional light sources. LEDs are fast and easy to control, so you can achieve fast and varied light colors. We can use this feature of LEDs to create many dynamic effects.
Fifth, LEDs can be used to construct various patterns. Due to the small size of the LED, the firm structure and short response time, we can use the LED to construct a certain pattern; then combine these graphics to achieve some design effects. Now, in the streets and shops of the city, we can see a lot of flat patterns or three-dimensional graphics built by LEDs, which can achieve very dazzling effects. In addition, we can carry out large-scale centralized control of LEDs, using the entire building exterior as a dynamic screen display. 