Principle of stepless dimming downlight
LED spotlight technical requirements
At present, LED spotlights are mainly used to replace traditional halogen tungsten 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 have been formed. At present, the certification of LED spotlights is mainly based on European CE and North American UL certification, and voluntary certification (CQC) can be carried out in China.
CE certification includes LVD and EMC. LVD is implemented in accordance with EN60968 standard (IEC 62560 will be upgraded); EMC is implemented in accordance with EN55015, EN61547, EN61000-3-2 and EN61000-3-3 standards. In addition, LED segment dimming power supply usually requires additional reference to IEC 62471 for photobiological safety testing. In North America, UL safety and FCC electromagnetic compatibility certification is usually required. UL implementation standards are UL1993, UL8750 and UL1310; FCC implementation standards are FCC PART15 Subpart B. In China, voluntary certification (CQC) is adopted for LED spotlights, and the implementation standards are GB24906-2010 (safety) and GB 17743-2007 (electromagnetic compatibility).
In addition, there are many standards for the performance of LED spotlights. The United States has ENERGY STAR requirements; 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 efficiency, luminous flux maintenance rate, life, central light intensity, nominal power, power factor, product identification, etc. of LED spotlights are specified.
The lifespan of many electronic products is judged by being broken, but LED is a kind of stepless dimming downlight with a long life, which can be used for a long time without breaking. However, the output of the luminous flux will decay with time, so the industry usually defines the life of the LED light source by the time it takes for the light to decay to 70%, that is, L70. With the advancement of technology, the light decay of LED is getting slower and slower, and it is difficult to completely test the time when the light decay reaches 70%.
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