Challenge the limits of LED application -- 863 successful application in Tibet area above 4500 meters above sea level

In June 10, 2011, the National 863 Program "semiconductor lighting project" major project "solar LED Street" research results of the first 756 sets of solar LED street in Shigatse District of Tibet in 42 villages of 6 counties installed. Through more than 2 months of field operation, good lighting effect, through the acceptance of the project supervision department. This is the 863 Plan "semiconductor lighting project" major projects of scientific research for the first time application of mass promotion in the Tibet area, but also create an altitude of 4500 meters above the centralized installation of hundreds of sets of solar LED Street Records in the world.

The project put forward very high requirements on the reliability of the whole lamp. Installation of an average altitude of 4500 meters above sea level, up to 6000 meters. Maximum daily temperature difference + 32 C. The use of solar energy LED lamps in the project requires a normal working temperature of 30 degrees below zero, which set a higher demand on the low temperature resistance of LED lamps constant current circuit components. In addition, there are still more than 4500 meters above sea level on the impact of LED packaging, high temperature difference of climate requirements for welding, mountain roads and the light of the construction of the plateau, such as the 2 factors.

According to the operating environment of the products of the project, 863 project unit Beijing gaokeneng photoelectric technology limited to 2000 meters above sea level as the basis, every 1000 increase in capacity of 10% meters drive components; high and low temperature test LED (pre -40 --+85 DEG C) 200 cycles; LED package finished UV resistance test, lens no discoloration; LED welding temperature and considering the variation of material shrinkage rate factors. Through the above aspects of the design and technical innovation, and ultimately developed to meet the high altitude, suitable for harsh climatic conditions of solar LED street lamp.

At present, the project is running well, LED lamps in 3 months experienced a temperature difference of 25 degrees per day, the lowest humidity of up to the highest level of 6000 meters and the operation of the region, there is no driving circuit, LED light source and other quality problems. The successful implementation of this project will accumulate valuable experience for the application of LED lamps in high altitude areas in the future.