LED lighting energy conservation is the constant pursuit

At present, the application of LED lighting is still based on public facilities, airports, stations, hotels and other large LED lighting applications. This article takes the lighting project of the new terminal building of Chengdu Airport as an example to discuss the current demand and development trend of LED lighting design and engineering design for LED lamps.

LED lighting trends: energy conservation is the same pursuit of energy conservation is a constant pursuit of the use of LED light source under the premise of how to further improve the energy efficiency of lamps is a new topic in front of us.

In the 21st century when science and technology explode, global politics and economy are rapidly changing. Energy and climate issues have invariably become the hot issues focused on the development of various countries, and lighting is the intersection of these two issues. In the energy consumption rankings, lighting ranked first, accounting for about 25%. At present, major economies such as the United States, Russia, Japan, and South Korea have all introduced the elimination policy of traditional light sources and the popularization of LED lighting. China is no exception. This year, announcements have been issued that incandescent light bulbs will be gradually banned.

In this issue, the direction of choice of lamps and lanterns between countries and companies is the same. At the beginning of many large-scale lighting projects, it was already clear that the Indoor Lighting will use LED lighting fixtures. In this way, the cost of electricity in operating costs can be greatly reduced. However, under the premise of using LED light sources, how can we further improve the energy-saving effect of lamps and lanterns? This is a new topic in front of us, but also LED lighting design and development process worthy of profound consideration.

At present, during the design and development of LED luminaires, almost all designs are centered on how to improve the light efficiency of the product. From the design, testing, analysis of power supplies, to the selection of LEDs, the arrangement of arrays, to the requirements of the haze of light-transmitting boards, and even the color of screen printing fonts on PCBs, designers throughout the industry have been doing their best to improve light efficiency. .

The lighting project of the new airport terminal of Chengdu Airport clearly puts forward the requirement of using LED light source with luminous efficiency≥110lm/W and full lighting efficiency≥65lm/W, which is a very high indicator for indoor lighting and is also LED. Light sources have reached the technological level that can be achieved in the last year or two. In the end, the project selected a round embedded downlight, the overall lighting efficiency up to 73.26lm / W, exceeding the requirements of more than 10%.

The harsh requirements for light efficiency are not difficult to understand, because higher efficiency LED lighting means energy consumption can be further reduced. Taking the circular recessed downlight as an example, Chengdu Airport was originally set at 21W with a rated luminous flux of 1170lm. The measured luminous flux was 1282.08lm, and the power was only 17.5W, which was 3.5W lower than the original 21W. Based on the total number of 10,000 lighting fixtures in the entire airport, assuming an average of 12 hours per day, the electricity saved is 153,300 kWh, equivalent to about 180,000 yuan per year for local electricity. What's more important is the carbon emissions, environmental pollution, and climate impact behind this 180,000 yuan per year. This has far-reaching implications for companies and countries.

Visual experience is personal experience Visual experience includes not only the comfort of the lighting, but also the appearance and installation details of the fixture.

The lighting level of airport buildings has clear illuminance, glare, and color rendering requirements in the national standard “GB50043-2004 Architectural Lighting Design Standards”. However, for customers, meeting only the requirements in the standard is far from enough. The actual lighting design must be carried out in close cooperation with factors such as the nature of work in different areas of the building, the scope of the crowd, and the architectural structure in order to give the customer a good visual experience. ,Recognized.

Good visual effects depend on the excellent design of the overall lighting project and the excellent performance of the lighting fixtures. In lighting design, careful simulation analysis should be performed on the lighting solutions in each functional area. That is, lighting simulation software is used to design lighting fixtures, types, luminous flux, and light distribution curves in different regions. While satisfying functional requirements, attention should also be paid to details and humanity. For example, in a more spacious space, in order to avoid glare on a large number of lamps on the ceiling, sidelights may be lighted using a hard light bar, and warm white and low power and illumination are used in the rest place to make the light more uniform and soft. People's comfort.

In the Chengdu Airport lighting program, the use of LED as a light source, combined with the application of new optical materials such as high-reflection, high-transmittance masks, makes the efficacy of LED lamps much higher than traditional lamps. In addition, the intelligent control system can obtain the ambient light illumination through a photodetector, and then adjust the brightness of the lamps in a specific area in combination with the control system, so as to achieve the higher-level needs such as on-demand lighting and secondary energy saving.

The visual experience includes not only the comfort of lighting, but also the appearance and installation details of the luminaire. For the installation of cylindrical surface mounted downlights, it is necessary to ensure that the luminaires can be precisely adjusted within a certain range of length, width and height, and that the luminaires are completely perpendicular to the ground after installation, and that no screws or other parts of the components can be seen. These harsh conditions have brought more and more challenges to luminaire design.

Therefore, in indoor lighting design, lighting design, architectural design, on-site construction and other units communicate with the customer, discuss, research and solve various problems, multi-cooperation, matching and design of LED lamps for the project, has become a new Lighting design trends.