Power supply is the device to change other forms of energy in to electric energy. Power supply products are widely applied in industry automation control, military equipment, scientific equipment, industrial equipment, computers, communications equipment, electrical equipment, instruments, medical equipment, semiconductor refrigeration and heat and other fields. There are two common types of major...
According to CIE, EN and LM-79(Clause 9.1) etc standards, spectroradiometer integrating sphere system is used for all kinds of light source photometry parameters test. The following introduces Lisun several different spectrometers’ characteristics and applications briefly. LMS-9000A/LMS-9000B High precision CCD spectroradiometer. LMS-9000A is mainly used for LED light source test. Test datas me...
1. According to the reflectivity of the internal coating: How to choose integrating sphere Note: It can select the coating according to the test requirement, the default is the BaSO4 coating. 2. According to the test method: We don’t discuss both the integrating sphere and goniophotometer here, we only talk about integrating sphere optics. How to choose integrating sphere Specification: The abov...
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 well as we know that for the LED luminaires lumen test, the CIE121: 1996 Clause 6.1, CIE127-2007 Clause 6.2 and IES-LM-79-08 Clause 9.0 are mentioned two luminous flux test method: the first is adoption integrating sphere+photometer or spectrometer(recommend by CIE121: 1966 Clause 6.1.1, CIE127-2007 Clause 6.2.and IES-LM-79-08 Clause 9.0), this kind of test method is relative measurement method...
HCS-109A has two functions: one is high frequency ballast; second is high frequency digital power meter. As above picture show, after we connected instrument with test samples, high frequency constant power source will output high voltage to start test lamp (tube), high frequency constant power source output frequency range is 20KHz-26KHz, it can provide continuously adjustable current 100mA-500m...
During the measurement of luminous flux with integrating sphere, comparing with common lighting source, the luminous flux test accuracy of LED lighting source have given huge challenge to the testing equipments. On the one hand, LED light source have outstanding directively characterizes than other ordinary light sources. Normally it wouldn’t uniformly emit lighting at all the direction on the w...
The ideal integrating sphere paint should have below performances: 1. High-Lambert characteristics (good diffuse reflection characteristics) 2. High reflectance in a wide wavelength range 3. High stability 4. Easy construction 5. Easy to remove The history of integrating sphere coating: In 1934, Principle of Optics mentioned the description of principle of integrating sphere and the formulations o...
According to IESNA-LM-79-80, when spectroradiometer integrating sphere system tests LED flux, light source’s self-absorption can influence test result, therefore, it usually introduces Auxiliary Lamp. The induction of absorption Auxiliary Lamp can solve the absorption problem of the tested lamp itself. How to use Auxiliary Lamp correctly? Lisun LPCE-2(LMS-9000A) High precision Spectroradiomet...
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