LED Tester | Christmas Light Tester - LISUN

How to choose the right goniophotometer according to the standard LM-79 and EN13032-1？ There is a wide range of  goniophotometers  on sale in the market, including central rotation type, rotation mirror type, double mirror type and so on. How to choose the corresponding goniophotometers for the tested lamps becomes the most important problem for the users. This article makes a brief introduction to this knowledge based on LM-79 and EN 13032-1. A-α B-β and C-γ Co-ordinate System According to EN13032-1, no matter what kind of goniophotometers is used, the main measurement plane must be based on the picture below when measuring the light distribution performance of the luminaire 1.    First axis 2.    Second axis 3.    Third axis 4.    Photometric Center On this basis, the main coordinate systems used in the past are the following three: 1.    A-α：This coordinate system has not been used any...

Abstract:  According to the particularity of LED luminous flux measurement, unique optimization is adopted in the design of the  integrating sphere  for LED measurement combined with the diffuse materials of high reflectivity, which makes the system stability and accuracy have great improvement. The experimental results show that the system stability and consistency is much higher than other common LED test system. It is the system which is really suitable for LED optical parameters measurement. Keywords:  LED Measurement, Integrating Sphere, A molding Integrating Sphere, Diffuse Reflection Introduction:  Different with the traditional light source, the luminous flux measurement of  LED light source  has posed a big challenge to the equipment in testing the veracity in the process of using the integrating sphere to test luminous flux. On one hand, compared with the traditional light source, usually, LED has much stronger directivity, and will not ...

The most critical factor that affects the quality of lighting is the luminous distribution performance of lamps. Using scientific testing methods and selecting the appropriate test instrument is the basis of obtaining accurate luminous distribution properties of luminaires. The test of luminaires’ luminous distribution is an important part of luminaire design and lighting design for quality control. Especially with the development of new sources and new lighting technology, it presents new challenges for the test of luminaire luminous distribution. Thus, Lisun has developed various goniophotometers which adopting different test methods for testing luminous distribution. 1) Moving Detector Goniophotometer The method of goniophotometer to test total luminous flux is spectrophotometry. The principle is to test the luminous intensity of light source at different directions (or the illumination at a given distance from the light source), and then to calculate the total luminous flux b...

Along with the technical development, more and more digital and high speed electronic and electric devices are widely applied to vary industries. Those equipments push the society developing, and the same time they bring the electromagnetic pollution problem to the society. Electromagnetic pollution, water pollution and air pollution are the three big pollution sources for modern life. Go with series electromagnetic problem,  IEC 61000-4-4 ,  IEC 61000-4-5 ,  IEC 61000-4-11 , CISPR -16, CISPR-15 and other relative standards are introduced by IEC. The main purpose for those standards is to limit radio disturbance and put forward the method of measurement of electronic and electric device, so that to decrease the society problem which brings by electromagnetic disturbance. As we know, the test object for EMC is electronic and electric device, among them, lighting is an important part which should do the  EMC test  naturally. Like FCC from America and CE from Eu...

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 market quality checking, the failure rate of LED lighting product reach to 39%, most of failure products related with harmonic currents, surge impact, harassment voltage electromagnetic compatibility test items. Electromagnetic compatibility (EMC) is an important factor affecting the reliability of LED lighting products. 1. EMC Test Standards: There haven’t LED special standards focus on EMC test, the current practice is based on the field of LED lighting products, refer to the implementation of the rel...

With the widespread use of electrical and electronic equipment, the problem of electromagnetic disturbance has also brought electromagnetic pollution. EMC(Electro Magnetic Compatibility) refers to the ability of a device or system to operate within its electromagnetic environment without incurring unacceptable electromagnetic interference to any device in its environment. EMC testing, one the one hand refers to the electromagnetic interference from the devices during normal operation in its environment cannot exceed a certain limit, on the other hand refers to the appliance has a degree of immunity to electromagnetic interference present in the environment. It divides broadly into emissions testing and susceptibility testing. Electromagnetic Interference (EMI): RE (Radiated Emission): Test unintentional release of electromagnetic energy from an electronic device or apparatus. CE( Conducted Emission): Test the electromagnetic energy travelling along the power line, control l...

IES LM-79-08 “Electrical and Photometric Measurement of Solid-State Lighting Products” as the exclusive international standard for measuring the total luminous flux, electrical power, luminous intensity distribution and correlated color temperature (CCT), color rendering index (CRI) and other colorimetric parameters of solid-state lighting products (SSL), it highlights the total luminous flux of SSL products should be measured with the  integrating sphere  system or  goniophotometer . So the integrating sphere, as one of the main measuring instruments of SSL products, it can reduce and eliminate the measurement error caused by the difference of light shape, divergence angle and responsivity of different positions on the detector. Its design and manufacturing process is especially important and will directly affect the accuracy of test results. Here we take a look at the current status of the production of integrating sphere technology in China market. The Status of...