• The CV model load is the basic of the LED power supply test. CV is constant voltage, but the load is only the current load equipment, itself does not provide constant voltage, therefore, the so-called CV is just through the voltage negative feedback circuit, to servo the change of LED power supply output current, to make the LED output capacitor charge balance, thus achieve the purpose of constant voltage. Therefore,…

  • SSL (Solid State Lighting) product’s color quality is very important; people pay more and more attention to it. CRI already has 40 years history. CIR is a quantitative measure of the ability of a light source to reveal the colors of various objects faithfully in comparison with an ideal or natural light source, which is color fidelity degree. There are many problems when CRI is applied in LED at present….

  • IEC/EN 62471 is to assess relative optical radiation safety of different lamps and lamp system. It fully replaces IEC/EN60825 regarding the requirements of LED products energy level and adds the requirements of photobiological, including spectral irradiance and spectral radiance. According to the test data, it classify the hazard level of the products, including exemption level, low hazard level, middle hazard level and high hazard level. The EU part of standard…

  • Due to the LED light source manufacturing technology development, widely application layer surface, so in order to ensuring the safety of consumers, UL established UL8750 for LED module and lighting lamps and lanterns and safety standards to regulate the LED lighting products. This standard is the industry sales LED products to North America essential safety norms, apply to the LED as the main source of various products, including lamps, bulbs,…

  •   LED coated with phosphor powder on the LED chip to achieve white light emission. There are three main methods to realize white light with phosphor powder, but they are not completely matured. So the application of LED in the field of illumination is seriously affected by LED. Specifically, the first method is applied to the blue LED chip which can be excited by the yellow phosphor blue light, the…

  • As the basic test equipment to measure LED luminaries or other lighting product’s performance, the photometer & integrating sphere system has been used at lighting industry for many years. The first generation test instrument is photometer, then single-monochromator spectrocolorimeter, double- monochromator spectrocolorimeter and developed array CCD spectroradiometer in now days, the lighting testing equipment’s update speed and test precision have great progress in the past few decades. But no matter…

  • LEDs and LED luminaires with high light efficiency, longer lifetime, better energy saving and environmental friendly advantages to achieve top position on the lighting industry, like indoor and outdoor lighting application. With the introduction of various national support policies, there appeared many LED lighting products manufacturer, but the quality of LED lighting products is not good well which influence the LED lighting product’s marketing promoting more or less. According to…

  • The LED stroboscopic effect actually have two concepts: One is strobe which mean the depth of light flux fluctuations, the more violent fluctuation, the depth of strobe more lager. Second is stroboscopic effect which mean the human visual produce negative effects of electric light flicker, the more violent fluctuation, the negative effects more lager, the damage will be more bad. The flicker and stroboscopic effect have direct relationship with electric…

  • The ballast (resistor ballast) is a device for limiting the flow of sunlight and generating instantaneous high pressure. Following is some difference between the electronic ballast and inductance ballast.   1. Inductance Ballast is an iron core inductance coil, the inductance characteristic is when the current changes in the coil, the magnetic flux changes, resulting in the induction electromotive, its direction and current changes in the opposite direction, thus impeding…

  • 1. Japanese Lighting Market According to Japan’s Lighting Industry Association (JLMA) statistics, lamps and lighting product development trend will be more and more closed to LED lamps products. As the end of 2014, LED lamps and lighting products in the proportion of shipments reached nearly 70% (view chart). And in the specific classification of LED lamps, the use of household products will account for 56% of the total amount of…

  • Now, the led COB package, in fact, we can know that most of the COB package, including Japan COB packaging technology, they are based on the package of in-board. There is N chips integrated inheritance packaged by the in-board, which is called COB technology.  We all know that the underlying substrate is a copper foil, it is only a good electricity, can not do a well optical processing. MCOB is…

  • Under the effect of high temperatures, the structural characteristics of non-metallic materials, insulation materials will change greatly, which manifests itself softened or melted. Ball pressure test is used to test the heat resistance of non-metallic materials and insulating materials. It indicates the requirements of the ball pressure test in IEC60695, UL, IEC884-1, GB / T5169.21-2006, GB4706.1-2005 and GB2099.1-2008 and other standards. During the test, to make the test results more…