GL Optic integrating sphere allows for precise measurement of large LED modules

Aug. 1, 2014

For measurement of the luminous efficiency and luminous flux of large objects with the help of an Integrating sphere, GL Optic has developed the GL OPTI SPHERE 2000 (GLS 2000). With an internal diameter of 2000 mm and an opening aperture of 700 mm the system is able to accommodate complete lamps but also large modules comprising several LED arrays. In this way GL Optic, in their capacity as measuring systems manufacturer, account for the increasing demand in measurement equipment suitable for measuring LED modules and LED engines with ever increasing dimensions and higher luminous flux values.

The Integrating sphere GLS 2000, whose surfaces is coated with barium sulphate, a diffuse-reflective material, provides the basis for a large number of technological lighting measurements due to complete integration and mixture of radiation. As the use of LEDs becomes more and more wide spread in lamps and lighting features, manufacturers, system integrators, lighting designers and scientific laboratories increasingly face the requirement for carrying out complex technological lighting measurements of these LED lamps. The Integrating sphere provides enough space for accommodating complete lamps and also offers the spectral capacity for testing the entire product. The GLS 2000 can be used for all types of lamps, such as street lights, emergency lighting, lamps for medical purposes or vehicle lights. Thanks to its spectral properties and a calibrated spectral range of 240 to 2600 nm, GLS 2000 is an ideal tool for determination of luminous radiation values (mW) and luminous flux (lm). The system is capable of simultaneously measuring the absolute value and various radiometric and photometric parameters. These include determination of the colour rendition index (CRI) according to CIE, correlated colour temperature (CCT) according to CIE and colour coordinates according to CIE 1931 and CIE 1964. The efficiency of the light source can be deduced from the measured values for luminous flux and luminous efficiency. Moreover, the operator can determine by which extent the electronic elements, exciters and current supplies used have an influence on the spectral properties of the LEDs. In this way, the influence of dimmers and cooling equipment or any optical components, such as lenses, reflectors or diffusers, integrated together with the LEDs can be determined. In addition to measurement and evaluation of the basic parameters, the accompanying GL SpectroSoft software, also developed by GL Optic, allows for automatic specification of many other lighting-related variables. These variables include tristimulus value, chromaticity coordinates, dominant wave length, peak wave length (in nm) or half-power width of the spectral lines. The Integrating sphere GL OPTI SPHERE 2000 is characterised by easy and reliable handling in day-to-day practice. The features included are an auxiliary light source for compensation of self-absorption, a lateral measurement opening for determination of the luminous flux in the 2π configuration for front emitting light sources and an adjustable sample holder in the centre of the sphere for measuring the luminous flux in the 4π configuration for light sources emitting light in all directions. In connection of a GL spectroradiometer, GLS 2000 provides extremely accurate and reliable measurement results, also for light sources with discontinuing emission spectra; therefore, it is perfectly suitable for LED measurements in accordance with CIE 127:2007. Depending on the budget or measurement requirements, GLS 2000 can be combined with all spectroradiometers by GL Optic. The combination of GLS 2000 and the spectrometer series GL SPECTIS 1.0 offers the best cost-benefit ration on the market. Thanks to its plug-and-play concept, GLS 2000 speeds up the measurements and thus contributes to launching new products on the market even faster. With all these properties, GLS 2000 not only caters for the requirements of lamp manufactures with regard to development and quality control but also of laboratory facilities, scientific institutes, consultants, material scientists and many other user groups. Technical Data: Internal diameter: 2000 mm Opening aperture: 700 mm External dimensions: 2200mm x 2200mm x 2300mm Spectral range: 240-2600 nm Internal coating: Barium sulphate (BaSO4) Auxiliary light source: White LED


GL Optic, a brand of JUST Normlicht GmbH


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