With the continuous consumption of energy and the scarcity of resources, the greenhouse effect is becoming more and more harmful to human beings. The pollution of the atmosphere to the earth is becoming more and more serious. The international demand for energy conservation and consumption reduction is getting higher and higher. The top priority of the work. China started the green lighting project as early as 1996, and proposed that lighting projects should save resources, prevent pollution, and benefit future generations. Over the years, through the joint efforts of all walks of life, as the fourth generation of light source semiconductor (LED) lighting products have made rapid development, and achieved remarkable achievements in energy saving.
China's outdoor road lighting accounts for about 30% of the total electricity consumption of lighting, which is closely related to people's production and life. LED street light as an important application of outdoor lighting, its superiority:
1. Long life of high-power LED street lamps
The focus of this issue, which is very much concerned by everyone, is as optimistic as the 5-10 million hours described by many domestic and foreign experts and company product brochures. In fact, the life of high-power LED street lamps depends on the following points:
(1) Chip quality and light attenuation value of LED light source.
(2) LED package quality. Consistency and reliability.
(3) The LED acts as a cold light source, but the LED semiconductor itself generates heat. The heat dissipation of the LED ensures good working conditions of the LED.
(4) Life quality assurance of power supply and constant current drive.
2, high energy efficiency
Lighting engineering is a systematic project. Whether it is clear lighting or atmospheric lighting, it is converted into light by electric energy, and then projected by the luminaire, so that a certain part of the illuminated surface achieves certain illumination, uniformity, color rendering, and multiple illuminated faces. The local synthesis of a complete lighting project can not be easily compared with power consumption, but through a comprehensive, comprehensive analysis.
3. Differentiation between conventional lamps and semiconductor LED lighting fixtures
The luminaire is a combination of light source, power supply, lampshade and other accessories. It is also used to control the light source and light projection, and at the same time it can protect the light source and improve the illumination efficiency.
The conventional street lighting fixture is mainly composed of a lamp housing, a light source cavity, an electric appliance room and the like. Because it has enough shell space and sealed and installed heat of activated carbon and foam silicone rubber, it ensures the working conditions of the light source. The protection level of the light source cavity is IP65, and the protection level of the electrical room is IP45. Conventional street lighting can be made into any shape as long as this protective condition is guaranteed. The design of conventional road lighting fixtures in China is brilliant, showing the scene of daytime viewing and nighttime viewing.
The introduction of semiconductor LED street lamps, the long life uniqueness of the light source, the superiority of easy and reasonable light distribution, the variability of color temperature, the advantage of high color rendering index, the low-voltage, current source power supply has the development trend of high efficiency and energy saving. .
There are inherent advantages to the application of LEDs to street lamps. The advantages are:
1. LED as a point source, if the design is reasonable, it can largely solve the problem of secondary light extraction and optical loss that traditional spherical light source must rely on light emission to solve;
2. The uniformity of the light-irradiated surface can be controlled, and theoretically, it can be completely uniform in the target area, which can also avoid the waste of light in the phenomenon of "lighting down" of the conventional light source;
3. The color temperature is optional, which is an important way to improve efficiency and reduce cost in different applications.
4. The space for technological progress is still very large.
4, LED street light optical rationality light distribution
Unlike traditional lighting, LEDs have a point source, high brightness, and narrow beam output. LED street lights should first be considered to fully utilize the limited luminous flux to the effective illumination range. Street lamps require road lighting effects. The open space beyond the road surface is not the effective range of street lighting. Therefore, effective control of the distribution of light, so that the light emitted by the light-emitting tube becomes a strip of light strip spread along the road surface, while also taking into account the generation of glare, is a higher requirement for designers of new LED lamps.
5. Comparison of main technical performance indicators of current LED street lamps:
6. Calculation of energy-saving indicators (calculated by 12 hours per day):
Energy saving every year = 365*12*(0.5-0.16)=1489.2
Annual electricity saving = 1489.2*0.8=1191.36 yuan
After the renovation of the LED street lights, each lamp saves an electricity fee of 1191.36 yuan per year. If the entire road surface uses LED street lights, it will save a lot of energy for the country every year, saving a lot of money in terms of economic benefits.
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