Brief analysis of LED spotlight technical requirements
With the rapid development of LED technology and the continuous improvement of light efficiency, LED spotlight technology is also developing rapidly. The current LED spotlights are almost the replacement of traditional tungsten halogen lamps. Compared with traditional lamps, LED spotlights have significant advantages in terms of energy saving and long life. With the reduction of the cost of LED spotlights, the application of LED spotlights has gradually begun to spread. This article will briefly introduce and consider the technical requirements of LED spotlights, the specifications and types of common LED spotlights, the structure of LED spotlights, the common sense of LED spotlights, and the development direction of LED spotlights.
First, LED spotlight technical requirements
At present, LED spotlights mainly replace traditional tungsten halogen lamps. Most of the relevant safety requirements refer to traditional lighting requirements, and according to the characteristics of LED lamps, a set of safety certification standards has been formed. At present, in the certification of LED spotlights, the international standards mainly include European CE and North American UL certification, and voluntary certification (CQC) is available in China.
The CE certification includes both LVD and EMC, of which LVD is implemented in accordance with EN60968 (which will be upgraded to IEC 62560); EMC is implemented in accordance with EN55015, EN61547, EN61000-3-2 and EN61000-3-3. In addition, LED lamps usually require additional reference to IEC 62471 for photobiosafety testing. In North America, UL safety and FCC EMC certification are usually required. UL implementation standards are UL1993, UL8750 and UL1310; FCC implementation standards are FCC PART15 Subpart B. In China, the use of voluntary certification (CQC) for LED spotlights, the implementation standards are GB24906-2010 (safety) and GB 17743-2007 (electromagnetic compatibility).
In addition, there are many standard regulations on the performance of LED spotlights. ENERGY STAR has relevant requirements in the United States; China has energy-saving certification requirements, and the implementation standard is CQC 3129-2010. Among these requirements, the color temperature, color rendering index, initial luminous flux, luminous efficacy, luminous flux maintenance rate, life, center light intensity, nominal power, power factor, and product identification of the LED spotlight are specified.
The lifespan of many electronic products is judged by broken, but LED is a long-life light source that can be used for a long time without damage. However, the output of the luminous flux decays with time. Therefore, the time required for the light to decay to 70% is usually defined in the industry to define the life of the LED light source, that is, L70. With the advancement of technology, the light decay of LEDs is getting slower and slower, and it is difficult to fully test the time of light decay to 70%. Since the life of electronic products is exponential, LEDs usually undergo aging for a short period of time. By sampling the light decay data and then estimating the light decay to 70% by exponential function, the formula is as follows:
Generally, the luminescence maintenance rate LM (Lumen Maintains) is 6,000 hours for LED aging. According to the exponential law, if LM >91.8% after 6000 hours, it can claim 25,000 hours of life. If LM>94.1% can claim 35,000 hours of life, However, the life calculation time does not exceed 6 times the test time.