• Definition: Means luminaries or light sources emit light intensity distribution in space. It can record the luminous flux of luminaries, light quantity, power, power factor, the size of the luminaries, luminaries efficiency including manufacturer of luminaries, type and other information. But the most critical is to record the light intensity distribution of luminaries in all directions. The classification of intensity distribution curve: light distribution curve according to the symmetry properties usually can be divided into: the axial symmetry,…

  • Standards GB17743-2007 / CISPR 15:2005 <Limits and methods of measurement of radio disturbance characteristics of electrical lighting and similar equipment> instead of the standards GB 17743-1999 and GB 15734-1995. The limits for the 2m loop diameter apply to equipment not exceeding a length of 1.6m, those for the 3m loop diameter for the equipment having a length in between 1.6m and 2.6m and those for the 4m loop diameter for…

  • The lighting industry practitioners must be familiar with IES file. Firstly introduce IES, IES is short for Illuminating Engineering Society of North America. I.E.S is founded in 1906, it is a technical Institute. Institute standardization work is responsible by more than 80 technical committees and subcommittees. Every technical committee is engaged in the research and standard formulation work of various lighting equipment. Investigate various lighting fields and report to director….

  • LED luminaires are this kind of device which can transmit, distribute, and change the light distribution of light source. They are becoming the main products of a new generation of lighting market with its high efficiency, energy saving, safety, long service life, compact, and other technical characteristics. They effectively promote energy-saving environmental protection industry of high-speed development. The usual parameters of light which associate with photometry are light intensity, luminous…

  • LED blue light hazard is to evaluate the photochemical damage of the blue radiation to the retina. In practice, we may observe the light source or luminaire emitting surface in different regions from different angles. Therefore, in order to meet a variety of applications, IEC 62471 provides that the blue light hazard classification should be based on the radiation exposure values (weighted irradiance and radiance) of the maximum brightness of…

  • LED heat dissipation has become more and more attention by people, this because its Lumen decay or its life is directly related to its junction temperature, bad heat dissipation, junction temperature is high, life is short, according to the Arrhenius method, each drop 10 ℃ temperature, life will extend 2 times. From fig 1 we know, if the Junction Temperature can be controlled on 65℃, then the life can be…

  • Integrating Sphere is a hollow sphere which inner wall is coated with white diffuse material. There are one or several apertures on the wall of the integrating sphere. The aperture is used as light well and receiving aperture for placing light-receiving device. The inner wall of integrating sphere should be good sphere. It usually requires that deviation from the ideal spherical should be less than 0.2% of diameter. The inner…

  • Goniophotometer is mainly used for measuring photometric characteristics of luminaries and light source; that is luminaries laser photometric and colorimetric value distribution in different spatial directions. Goniophotometer should be placed to do test in dark room. Many customers concern the size of goniophotometer. According to Energy Star IESNA-LM-79 Clause 10, For measurement of luminous intensity distribution, a sufficient photometric distance should be used –generally, more than five times of the…

  • 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…

  • During World War II and after the war, Western countries, especially the United States, have established a series of environmental testing ground, laboratory and developed environmental testing standards. Required by the US military, all weapons equipment, parts, materials, and ammunition must be sent to the environment laboratory to simulate environmental testing, and then sent to environmental testing ground to do field environment test. Only those through all these tests can…

  • UV aging test chamber is suitable for the aging test of non-metallic materials resistant to sunlight and artificial light. Light source adopts eight UV fluorescent lamps that rated power is 400W as a light source. UV fluorescent tubes are distributed on sides of chamber, every side has four (There are UVA-340 and UVB-313 light source for users to select the configuration). UV aging test chamber is to simulate lighting; it…

  • Xenon lamp aging test chamber adopts xenon arc lamp which can imitate the full spectrum sunlight to reappear destructive spectral wave in different environment. It can provide the corresponding environment simulation and accelerated test for scientific research, product development and quality control. It is also named “Sunlight Radiation Protection Test Device”. According to test standards and methods, there are three kinds of Xenon lamp: Air-cooled xenon lamp (LP/SN-500), water-cooled xenon…