LED street light and application

Introduction China has become the world's largest producer and exporter of solar LED lamps, LED landscape lights and street lamps. There are dozens of LED street lamp enterprises with certain R&D capabilities and production scales in China, and dozens of application demonstration roads.

In 2009, the Chinese government launched the “Ten Cities and Ten Thousand Miles” LED lamp exposure and energy conservation activities. In 2010, it has been clear that there are more than 10,000 LED lights in 21 cities nationwide. Among them, street lamps and 24 h continuous use of tunnel lights have become the first major replacement projects. Metros in Beijing, Shanghai, Guangzhou and Shenzhen have started to popularize LED lights. project.

1 LED landscape light

The city continues to expand, expanding the market size of urban road lighting. Road lighting and urban lighting are further integrated, and the road lighting market will develop into the urban lighting market in the next few years. Including urban road lighting, landscape lighting, advertising lighting, etc. Urban landscape lighting is based on functional lighting. In fact, functional lighting has already formed a certain landscape effect at night. As a manifestation of modern social civilization, landscape lighting should be compatible with the current economic level of the city and rationally planned. The content of urban landscape lighting generally includes the lighting of public squares, buildings, commercial streets, landscaping, landscape sculptures, bridges and waterscapes along the roads. Based on the overall plan of the night scene of the urban area, the effect plan that reflects the style should be selected to determine the appropriate lighting method.

LED landscape lights have been widely used in the 2008 Beijing Olympic Games, the 2010 Shanghai World Expo, and the 2010 Guangzhou Asian Games.

(1) Shanghai Oriental Pearl LED Lighting Project

In many cities in Europe and the Americas, mandatory landscape lighting restrictions have been formulated, mainly considering energy conservation and environmental protection. At present, a number of landmark buildings in Paris, Mexico, and Morocco have been retrofitted with landscape lighting.

There are 576 light guide points in the Oriental Pearl Tower on the Bund in Shanghai. Before the renovation, the power consumption of each light guide point was 200 W. After the renovation, the power consumption of each light guide point decreased to 70 W. This transformation alone saved 65. The % power consumption, combined with improvements in control systems and other floodlights, initially estimated a nearly 75% reduction in power usage. The 576 luminous points of the Oriental Pearl-sized spheres use LEDs, and the diameter of the illuminants is as large as the cross-section of the basketball. The electricity saved by the Oriental Pearl every night can be used by more than 800 households for 4 hours per day.

( 2) Shanghai World Expo LED Lighting Demonstration Project

China's 2010 Shanghai World Expo will have three semiconductor lighting demonstration projects: one is the LED full color display of the Expo permanent theme theme museum; the other is the 400 m2 large transparent LED display of the Expo World Expo permanent building; the third is the Expo Center 8 000 m Facade LED floodlighting and landscape system. In the entire Expo Park, 60% to 70% of the lights use LED lighting. During the 2010 Shanghai World Expo, all the landscape lights in the Expo Park made LEDs, and most of the street lights and indicators used LEDs. LED lighting accounts for more than 70% of the total lighting in the Expo Park. LEDs are used in such a large-scale and intensive manner in an area, which is the first time in the world.

The energy-saving and environmentally-friendly LED lighting solution helped Shanghai World Expo 2010 become a green environmental event. Through the 1878 Paris World Expo, Edison invented incandescent electric lamps made of tungsten wire and began to enter thousands of households for the benefit of mankind. The LED lighting advocated by the Shanghai World Expo may be another revolution. Through the new LED lighting technology to change people's lives and the environment of the earth, the application of LED lighting coincides with the concept of the Shanghai World Expo.

2 LED street light

There are two main types of LEDs used in road luminaires: one is a traditional road luminaire casing, but in a luminaire, a matrix is mounted on an almost flat mounting surface (also a reflective surface). The LED, this design is impossible to get a good light distribution. The other is to integrate multiple LEDs in a circular area (area diameter of about 30 ~ 40 mm), so that the light output density of this small area is close to the high-intensity gas discharge lamp, and then use the luminaire reflector to match Light, but the luminosity of this design is not superior to that of traditional road lamps, and because the high-density LED is integrated in a small area, the heat dissipation of the LED is obviously poor, which not only affects the LED. Luminous efficiency, but also often affects the life of the LED.

The technical parameters of a certain type of LED street light are as follows:
Input voltage: AC100 V ~ 265 V;
Light source power: 98 × 1 W;
Power factor: > 0. 95;
Correlated color temperature: 2 500 K ~ 10 000 K;
Adapt to temperature: - 35 °C ~ 50 °C;
Luminous flux: 7 240 lm;
Protection level: IP65;
Service life: > 50 000 h;

Average illumination: greater than 39 lx for a pole height of 6 m, greater than 21 lx for a height of 9 m, and greater than 14 lx for a height of 12 m;
Effective illumination range: pole height 6 m is 10 × 24 m2, height 9 m is 12 × 30 m2, height 12 m is 16 × 35 m2;
The main material: aluminum alloy, net weight of 5.0 kg;
Installation pipe diameter: φ61 mm;
Dimensions: 308 mm × 556 mm × 70 mm.

(1) Domestic LED street light demonstration project

At the beginning of 2008, the Ministry of Science and Technology, the Ministry of Information Industry, the National Development and Reform Commission, and the Ministry of Construction of the Ministry of Construction conducted a survey and discussion on the topic of “LED Street Lights Applied to Urban Road Lighting”. At the meeting, a comprehensive pilot was launched for the larger differences of opinion. Guidance on accurate data. Nanjing has organized relevant tests.

The pilots of the six LED road lighting manufacturers in Shenzhen, Nanjing, Xi'an and other places, the test lamps are LED street lights with a power of about 150 W, selected in Taishan Road, Nanjing (road width 36 m, central symmetric cloth) Lamp mode, pole height 10 m, spacing 34 m, original installation 250 W high pressure sodium lamp) Conduct field road lighting test, each manufacturer provides four sets of products, installed on two poles of two consecutive poles. Taishan Road is located in Hexi New City, Nanjing. There are less interference light on both sides of the road. The measured data are measured from two poles of the same type of LED street light. The parameters obtained can reflect the actual lighting of the LED street light. The measurements were taken at the initial stage of installation and after 40 days of use. The statistical results of the test data are shown in Tables 1 and 2.

Tests show that the photoelectric parameters of LED street lamps have little attenuation after 40 days of use, and some have risen, indicating that LED technology level, light efficiency and life are developing rapidly, but the life of 5 × 104 ~ 10 × 104 h refers to LED light source chips. The theoretical calculation of laboratory data is not the actual test result, nor the overall service life of the LED street light. The LED light source and its driving are electronic components. Under the adverse conditions of outdoor, light, temperature, rain, snow, vibration, dust, lightning and line faults, the actual life is definitely shortened. The specific situation needs further tracking. .

(2) Foreign LED street light demonstration project

As early as 2000, Philips first used a red LED matrix to make street lights, and the fan cooling achieved similar effects to high pressure sodium lamps. After 2003, demonstration plans for LED street lights were launched in various countries, including the Netherlands, the United Kingdom, Canada, and the United States. At present, LED urban lighting systems have been applied in cities such as Toronto, Canada and Austin, USA. The LED City Lighting Initiative (LED City) was launched in February 2007. The demonstration plans for LED street lights in various countries are shown in Table 3.

As a new generation of lighting sources, LEDs will enter the general lighting field on a large scale in the next few years. Road lighting is highly functional. Compared with today's LED street lamps, high-pressure sodium lamps have high efficiency, long life, easy maintenance and excellent cost performance. LLED lamps are not an ideal breakthrough in road lighting applications.

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