From the current LED product structure and developing direction, the main testing standards for LED-related lighting products are focus on optical performance, electrical performance, terminal conductivity, radiation safety and service life. Optical performance is mainly related to the luminous flux, radiant flux, luminous efficiency, chromaticity coordinates, correlated color temperature (CCT), color rendering index (CRI). Photoelectric detection, light distribution detection, light energy detection, attenuation and anti-vibration test are five major normal testing for G24 LED lighting products.
However, according to a recent sampling LED test report, results are not satisfied. Recently, the Guangdong Provincial Bureau of Quality Supervision issued a product quality supervision and inspection testing report for self-ballasted LED lighting products. The final results showed that among 23 self-ballasted LED lamps, 17 are unqualified. The failure rate is as high as 73.9%. Failure items include accidental contact with live parts, the wet processing insulation resistance and dielectric strength, mechanical strength, fault status, chromatically tolerances, general CRI, harassment voltage, lamp power, heat resistance, interchangeability, power factor, the initial light efficiency / luminous flux, anti-blame capability and so on.
Awful LED test results happened frequently in recent years. Tracing the source, lacking of standards and immature testing systems mainly contribute to the high failure rate of LED sampling tests.
Although routine performance tests need to be taken before products leaving factories, not all manufacturers will follow testing standards strictly. On one hand, the majority of LED manufacturers do not have complete testing equipments. On the other hand, they need to take cost into account. Current large LED enterprises have nationally recognized LED test laboratories and relatively complete testing equipments. SMEs usually conduct several small simple LED tests (maybe a few hours), also lacking of necessary testing equipments. These phenomena led to the high failure testing rate mentioned previously and consequently a great deal of negative impact in the LED lighting market.
CRI should be greater than 80, otherwise the initial luminous efficiency cannot meet the requirements of energy efficiency to reach the energy-saving effect. Currently, some LED suppliers blindly pursue high luminous efficiency but ignore the light attenuation and total lifetime of their products, leading to the low service life of LED lighting products and the high failure rate.