Analysis on the Development of LED Lighting History

LED — the Fourth Revolution in Human Lighting History

Give the dark city a beautiful definition

“Landscape lighting” always reminds people of the colorful city and the colorful clouds above the bright lights. LED is the fourth revolution in the history of human lighting. LED is a kind of luminous semiconductor element, which is recognized as one of the most promising high-tech products in the 21st century. While triggering the lighting revolution, it also made significant contributions to promoting energy conservation, emission reduction and environmental protection. With the vigorous promotion of countries all over the world and the global industrial echelon transfer, the future landscape lighting will be a generation of LED dancing.

Why do Landscape Lighting Favor LED Lights

(1) LED lighting has great energy saving effect

The power of a single LED is only 0.03 – 1 W, and the driving voltage is low (1.5-3.5v) and the current is small (15-18ma). When the same lighting effect is formed, the power consumption is only 1 / 8 of that of incandescent lamps and 1 / 2 of that of fluorescent lamps. It can be seen that using LED light source instead of ordinary lamp and fluorescent lamp for landscape lighting with huge power consumption, its energy-saving effect is very obvious and has strong market competitiveness.

Moreover, the service life of LED light source is 100 times that of incandescent lamp and 20-30 times that of fluorescent lamp, which avoids the pain of frequent maintenance. Coupled with its rich colors and good controllability, it can be used for urban landscape lighting.

Now, LEDs are replacing traditional light sources at a growth rate of 50%. It will trigger the fourth revolution in the history of human lighting, greatly improve human living environment and alleviate the increasingly severe global energy crisis.

(2) Light source structure of LED

The light source is encapsulated by epoxy resin, with small volume, which can adapt to a variety of geometric sizes and different space sizes. LED light source is a solid light source, which is not inflated and has no gas sealing problem. Glass housing is not a must. Impact resistance, vibration resistance, not easy to break. This determines that its lamp intensity and stiffness are lower than those of other electric light sources. Moreover, LED is a cold light source with good controllability and fast response time. We can turn it on and off repeatedly and frequently without fatigue.

 

(3) LED light source is rich in color

The color is pure and rich, and can evolve any color, which is better than the color metal halide lamp. Its decoration is unparalleled. The delicacy of LED light source makes it flexible and can form a variety of shapes such as point, line, surface and ball. According to the purpose of landscape lighting decoration and beautification, LED light source can be made into suitable points, lines, surfaces, balls and other forms through intelligent control technology. Including: flicker (flicker) control, suitable for forming “points and lines”. Gradient (soft) control, suitable for forming “faces”. Dynamic change (jump) control, suitable for forming longitudinal and transverse dynamic changes of patterns. The above three changes can also form the rotation movement of the sphere. In addition, it can also achieve single lamp control and group lamp control.

LEDs Also Have Disadvantages

(1) LED is more “delicate”. It needs supporting solutions such as excellent heat dissipation and constant current drive. If it is not used properly, it is prone to light failure and even “dead light”.

(2) The power of a single LED is low. In order to obtain high power, multiple LEDs need to be used in parallel.

(3) In order to ensure high luminous efficiency, the LED color rendering index will be reduced. The color displayed under LED illumination is not as real as that of incandescent lamp. Experts should analyze this from the spectral distribution, which belongs to the technical problem.

Optimization Design of LED Landscape Lighting

LED landscape lighting needs engineers and designers to turn stone into gold.

Although LED is good and has obvious function in landscape lighting, landscape lighting is not a simple technical parameter. As a new carrier for the appreciation and promotion of the city, landscape lighting must be a perfect combination of art and technology.

Among them, technology is the foundation, and art needs the support of technology. Art is a perfect extension on the basis of perfect technology. It’s like a beautiful flower on a strong plant.

In the process of LED landscape lighting design and installation, engineers and designers should also pay attention to the following points:

The goal of landscape lighting is to coordinate landscape lighting with landscape, adapt to landscape conditions and architectural characteristics, and achieve a new level of beautifying the environment. At the same time, we should pay attention to humanization and intelligence. People in the world can endow Landscape lighting art with vitality only through light and lighting.

Problems needing attention of landscape lighting LED lamps

The design of LED lamps used in landscape lighting should be flexible, beautifying during the day and artistic lighting under the night.

The future landscape lighting is bound to jump out of the simple routine of hooking and running. Combined with the advantages of LED, provide high-quality and high-grade lighting projects and products. For example, people use LED lamps to outline the building, or embed LED lamps in the building facade and combined into patterns through light-emitting electricity. Or use small LED projection lamps to illuminate the local facade of buildings or components, etc.

For the lighting method that outlines the building outline or decorates the building facade through the brightness and position of the illuminant itself, in addition to considering whether the building volume and style as the illuminated object are suitable for this lighting method, the brightness of the lamp should also maintain a certain relationship with the surface brightness of the illuminated object.

In other words, in addition to letting people see the patterns composed of bright LED lamps, the viewer should also know the general shape and shape of the building, rather than letting some isolated bright lines or light spots float in the air inexplicably, nor mechanically illuminate the facade of the building.

Brightness and illumination direction of LED lights

When constructing the night landscape through the brightness and pattern of the illuminant attached to the building, we should pay attention to controlling the surface brightness of the lamps and the relationship between the lighting direction of the lamps and the viewer’s line of sight. Because the architectural night view belongs to the scale category of urban streets, people will watch it from many positions and directions. In other words, there will be a lot of viewing distance and viewing line of sight direction. Therefore, it is necessary to comprehensively consider the lamp design and lamp installation, so that the lamp made of LED light source with very concentrated beam can provide a satisfactory landscape at various angles and distances. Therefore, it is very necessary for landscape lighting project to conduct lighting effect test before the formal implementation of the project.

Economic demonstration of LED lighting

When using LED products in landscape lighting engineering, relevant economic demonstration shall also be carried out. Considering the advanced technology and reliability, construction cost, maintenance management and other related issues, we will improve the reliability of lamps and lanterns.

Although LED lighting technology has become more and more mature, heat dissipation and waterproof are still key issues, which should be paid special attention. If possible, relevant experimental results, we shall form demonstration and analysis materials  into a report as an integral part of the design scheme.

Relevant experts and scholars should also put forward practical opinions and suggestions on the standards and specifications to be followed by the use of LED light source in lighting engineering and the evaluation method of lighting effect, so as to make the project carry out smoothly.

In short, LED landscape lighting is a perfect combination of technology and artistry. Lighting engineers and lighting designers need to work together to start from the design concept and creativity, and refine the technical scheme, so that each LED landscape lighting can become a beautiful landscape in the city. Make the landscape lighting design perfect and moving.

How to Build High Quality LED Landscape Lighting

In landscape lighting, LED has more unique advantages. Scientists all over the world believe that led landscape lamps will develop rapidly in the direction of artistry, intelligence and flexibility along the avenue of interdisciplinary integration. LED is pregnant with unlimited business opportunities. Some inherent advantages of LED are the main driving force for the rapid development of LED landscape lighting. LED application developers need to closely contact customers and upstream and downstream industries to make concerted efforts to promote the application of high-quality products and projects. It mainly includes the following aspects:

1. Continue to develop high-power LED.
2. Compact modular power supply design of LED lamps.

LED power supply is different from traditional light source, using low-voltage DC. At present, the high-efficiency DC power supply is not mature, and the low-efficiency power supply system greatly reduces the energy-saving level of LED.

3. We should strive to eliminate the dot spot and uneven color mixing of LED planar light source.
4. LED application has incomparable advantages in landscape lighting. Soft light, bright colors, easy to realize dynamic digital control, energy conservation and environmental protection are important reasons for it to replace traditional landscape lighting lamps in the future. Therefore, we should strengthen led publicity and improve the level of selecting and using LED.