In addition, the definition of life of the LED lamps and lanterns is also questionable. Because the LED lamps and lanterns is different with the traditional light source of a single light of it is more light and light, light, and color difference between the color temperature, the change of the respect such as colour rendering in life in the definition of lamps and lanterns should also be considered. For example, a LED lamps and lanterns use after a period of time, the optic still maintain a rate up to 50% or 70% of its efficiency is higher than the initial efficiency, but its color rendering might have did not meet the requirements of use, then according to the actual usage, life end should assess the lamps and lanterns, but according to the current “national semiconductor lighting project research and development and industry alliance voluntary technical specifications” gives the definition of, the lamps and lanterns is life there is still no end, can be used. Zou Nian education thought, the life of the LED lamps and lanterns is defined, should not only focus on optic maintenance ratio, also need to consider the color temperature, color rendering index.
Zou Nian) said that many researchers at home and abroad is committed to the development of new LED lamps and lanterns of life evaluation method, but so far there are no established a convincing the whole lamp life of evaluation model.
The DOE report, industry is not yet a very feasible method to evaluate the life expectancy of lamps and lanterns. Although the lumen maintenance testing and planning standards have improved, but still drive color life and system maintenance are hard to quantify. DOE report aims to define the existing standards and planning standards, analysis points out that the existing defects of the definition of LED lamps and lanterns of performance. According to the report, the problem lies in: the existing methods to lumen attenuation as the only exit mechanism of LED lamps and lanterns, no standardized assessment method to solve the problem of components other than the light.
Longevity is much across barriers