Wu Yizhen is the director of the Urban Lighting Design Institute of the Civil Engineering Design and Research Institute of Fuzhou University, a senior member of the China Lighting Society, a professional lighting planning designer, and a professional lighting designer of Bovis Lighting Design Consultant Co., Ltd.
Editor's note: Salinen, a famous architect, said: “Architecture is like an open book, from which you can see the ambition of a city.†LED lighting is a popular theme for urban architecture night scenes, while it is widely used. It has also been blindly pursued by some city builders. The consequences of blindness are the emergence of multiple problems or hidden hidden. This article provides an in-depth analysis and research on these issues.
Foreword
The emergence of LED light source has opened up a new technical field for the field of illumination, and has been widely used in the characteristics of high efficiency, low power consumption, long life, small size and fast response, especially in the display, indicator light, Traffic lights and other aspects show its strong advantages. With the improvement of LED application technology, LEDs are widely used in urban night scenes, adding new vitality to the performance of urban night scenes, and thus are favored. However, we should see that because some cities did not carry out overall planning and positioning before the construction of the city night scene, LEDs were promoted as energy-saving products in the construction of night scenes, especially in the large-scale use of LED lighting in architectural landscape lighting. The night scenes of some cities seem to be disorderly and unsatisfactory, and the characteristics of the city's night scenes cannot be reflected. The image of the city is affected, which should attract the attention of governments at all levels and the city management departments.
At present, LEDs have problems in urban night scene applications.
1. Lack of planning and design, LED is blindly applied in night scene construction
Some cities did not carry out the necessary urban night landscape planning before the construction of the night scene. Even some single landscape lighting designs are often provided by lighting manufacturers or engineering companies to provide lighting solutions, especially in recent years. The proportion of applications is getting heavier and heavier, and the construction speed is getting faster and faster. There is a tendency to “suddenly come a spring breeze, and thousands of trees and pears bloomâ€. At the same time, when using LEDs, the color of light is not controlled, the use of colored light is more and more fancy, and the frequency of changing flashing is getting higher and higher, which makes the visual effect of night scenes more chaotic. Some cities' landmark buildings, administrative office buildings, residential buildings, etc. also use LEDs improperly, which makes these architectural landscape lighting lose their proper style, and even affects the residents' night life and interferes with traffic.
2. LED products are too single, the performance is too simple
Since LED products are still in the research and development stage, LED light fixtures, flat-line light strips, point light sources, line-type wall washers, etc., which are commonly used in night scene projects on the market, are commonly used. Although some manufacturers have also developed high-power LED floodlights, wall washers, etc., they are difficult to obtain due to their high cost. Especially in the architectural landscape lighting, a large number of simple design methods such as LED contour hooking, horizontal longitudinal array, and point and line combination have been adopted, resulting in repeated intersection, patterning, thawing, and compositional confusion of the city night sight line, resulting in night scenes. The effect is lacking in artistry.
a) improper use of colored light and dynamic light
Due to the rich color of LED light, the dynamic light performance is more flexible. In some cities, the construction of night scenes emphasizes the visual stimulation too much. The use of colored light and dynamic light is not limited and controlled, and even the pursuit of bright and beautiful, colored light and The flashing strobe lighting method, such as: excessive use of colorful water, full color jump, gradual change, etc., make the city's light color lose the tone, reduce the nightscape cultural taste, affect the public's appreciation psychology and aesthetic orientation.
b) LED inferior lighting products flood the market, causing waste of urban nightscape construction
At present, the country has not yet issued standards for LED quality testing. LED products on the market are difficult to distinguish. The quality of LED products is difficult to judge, and the restrictions on investment and bidding conditions and the drive of some engineering companies are beneficial. For other reasons, high-quality LED products are difficult to use, and some inferior and low-priced LED products are flooding the city's night market, which greatly affects the quality of urban nightscape projects. Some nightscape projects are in use. Soon, there was a phenomenon of high failure rate. Some of the problems occurred when the lamp was lighted while the lamp was on, which increased the maintenance and repair cost of the night scene, and even caused repeated investment and repeated construction.
Several issues worthy of discussion in the application of LED in urban night scenes
The night view of the city is a form of expression reflecting the level of political, economic and technological development of a city. It is also a comprehensive reflection of urban history and culture and progress of civilization. Creating a city night scene with distinctive features, showing the charm and connotation of the city, and letting the public experience the visual effect of the urban night scene that integrates urban lighting technology and lighting art is the real significance of urban nightscape construction. The author puts forward the following discussion on several issues worthy of attention in the application of LED in urban night scenes:
1. LED application in urban nightscape construction should be combined with urban nightscape planning
Due to its small size, low power consumption, long life, flexible application and strong visibility, LED is undoubtedly worthy of promotion and application. However, LEDs are widely used in large-scale, large-scale and large-area lighting. Whether the construction of the night scene is appropriate is a question worth pondering.
The night view of the city is an important resource of the city. It is a science and a visual art. Regardless of the size of the city, the streets and alleys, the former residence of the new building, etc., constitute a multi-carrier of the city's night scene. The construction of urban night scenes in China has brightened the city from the beginning, and now makes the night view of the city more attractive. It has gradually transitioned from perceptual construction to rational construction, so whether it is with traditional floodlights or the present “LED†night scene heat must be based on the city's overall planning, according to the city's planning, history and culture and development prospects, to rationally locate the city's night lighting, using light visual art, combined with various expression techniques, thus performing The characteristics of the city show the cultural connotation of the city. With the wide application of LEDs, it is especially important to design LEDs during urban nightscape planning and design. In the night scene of the city, we should advocate the rational, appropriate and appropriate use of LED lighting, and combine the LED lighting technology with other lighting methods such as floodlighting, interior lighting, and contour lighting to design and apply. Some important buildings are not. Suitable for simple LED lighting, it should be strictly controlled. For some urban landmark buildings, large-scale building lighting, when using LED, should carry out environmental and visual analysis, scientific design, high-standard construction, to avoid blindness and affect the city image night scene and artistic taste. Only under the premise of urban night landscape master plan, scientific application of LED lighting, combined with various lighting methods, can artistically display the integrity and harmony of the city's night scene image, and the city's night scene has vitality.
2. Pay attention to the application of LED light color and dynamic light
LEDs have high brightness, strong directionality and variety of light colors, and the programming control is more flexible, and the application is easy to produce. For this reason, attention should be paid to the control of LED light color and dynamic light in practical applications.
Editor: China Lighting Network - Wheat
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