1 Introduction The Great Hall of the People is located on the west side of Tiananmen Square. It was completed in 1959 with a total construction area of ​​171800 m2 and the highest part is 46.5 m. The Great Hall of the People is the place where the National People's Congress holds meetings. The central part of the 10,000-meter auditorium and the northern banquet The hall, the office building of the Southern People's Congress and the halls surrounding the auditorium. The 10,000-meter auditorium is the main building of the Great Hall of the People. It has a depth of 60 m, a width of 76 m from north to south and a height of 32 m. The countertop is 32 m wide and 18 m high. As a demonstration project of lighting energy-saving renovation, the 10,000-person auditorium replaced the original incandescent lamp, energy-saving lamp, T8 fluorescent lamp, twisted-pair tungsten wire reflector lamp, halogen lamp, etc. into LED lamps, and developed and rationalized the high-power LED lamps. The lighting design, careful construction and strict inspection and acceptance. Practice has proved that all the lighting indicators have reached the expected goal, the overall space environment is moderately light, comfortable and pleasant, whether it is the rostrum or the auditorium, the characters can be clearly visible, no glare, and have obvious energy-saving benefits. 2 Basic conditions before the transformation The 10,000-person auditorium is the most important conference hall in the Great Hall of the People. The 10,000-person auditorium is fan-shaped and is divided into three levels. It has nearly 10,000 soft seats and all seats can see the rostrum. The ceiling of the auditorium is in the shape of a dome and the wall is curved, reflecting the design idea of ​​“water and skyâ€. In the center of the top is a ruby-like giant five-pointed star lamp, surrounded by gold-plated 70-ray lines and 40 sunflower petals, and more than 500 stars in the ceiling. In addition to performance lights and fluorescent lights, the illumination source of the 10,000-meter auditorium has a color temperature of 2700 K and a fluorescent lamp color temperature of 3000 K. The top of the audience hall, the starry sky, the sunflower petals and the chairman's mouth 1000W twisted tungsten wire reflector lamp, the 1000W explosion-proof halogen lamp on the podium, the audience hall and the 5000W backlight of the podium. It is a light source with large power consumption, low efficiency and short life. The number of light sources used and the installation height of the luminaire are shown in Tables 1 and 2. Before the renovation of the lighting, the lighting department of the National Construction Engineering Quality Supervision and Inspection Center commissioned by the competent department of the Great Hall of the People to test the lighting conditions of the 10,000-meter auditorium and the surrounding hall. The purpose of the test is not only to understand the current lighting situation, but also The lighting level that should be achieved after the renovation of the lighting provides a reference basis. The test results and subjective evaluations indicate that the lighting level of the 10,000-meter auditorium and surrounding halls needs to be further improved. The test results are shown in Table 3. 3 LED application prospects in indoor lighting From the application field, LED lighting has gradually shifted from outdoor lighting to indoor lighting in 2012, and indoor lighting applications are expected to become mainstream. LEDs are used indoors for better stability, reliability, and safety. The application of LED lighting in indoor lighting will be an important development direction in the future. At present, LED has been used in commercial lighting and hotels, but still need to pay attention to LED light quality, lighting, security and other issues. In addition to meeting basic functional requirements, the application of LED in indoor lighting is more important to consider the human feelings and the visual comfort of people. LED lighting in such a large indoor space in the 10,000-meter auditorium, such an important application, whether it is the development of light source lighting products, lighting design research, installation and debugging are a huge challenge, but also for LED lighting applications Demonstration role. LED lighting has the following advantages in the application of the 10,000-meter auditorium: (1) Energy saving effect is remarkable, safe and reliable When the traditional illuminator is used for lighting, the total power of the 10,000-meter auditorium is 758 KW. The energy consumption is much higher than that of ordinary large-scale public buildings. The lighting and energy-saving renovation of the 10,000-person auditorium will bring huge lighting and energy-saving benefits to the Hall. At present, the luminous efficiency of LED light source has reached more than 100 lm/W. The energy consumption under the same illumination is only 10% of that of incandescent lamps and 50% of fluorescent lamps. LEDs do not contain mercury, instead of incandescent lamps and fluorescent lamps, environmentally friendly and non-polluting, no ultraviolet radiation. The startup time is short, no preheating is required, and there is no stroboscopic flashing in an instant; LED can realize intelligent dimming, brightness can be adjusted as required; safe and reliable, easy to maintain, it is the most environmentally friendly and highly safe light source. Especially in the stage lighting application has obvious advantages, high light efficiency can save a lot of lighting power, continuous dimming color temperature changes are small. (2) It can effectively reduce the heat radiation of traditional light sources Most of the lighting sources used in the 10,000-meter auditorium are mainly incandescent lamps and halogen lamps. The heat generation is large and the light efficiency is low. Most of the energy consumed is converted into heat energy, which causes great waste of energy and brings temperature rise to the environment. The air conditioning load also caused a waste of energy. Since the LED is a cold light source, the photoelectric conversion efficiency is high, and the extremely low infrared radiation can be beneficial to improve the use environment, and finally can effectively improve the human health level and visual comfort. (3) Long life and greatly reduced maintenance costs LED light source has a life of up to 50,000 hours, 50 times that of incandescent lamps, 5 times that of fluorescent lamps, and professional stage lamp halogen tungsten light source has a life of only 200 hours, and it is unstable and unsafe, especially for such a large indoor space. Lamps and cleaning are difficult to maintain, and maintenance and management costs are greatly increased during operation. 
