ISP Series Integrating spheres for all applications We bring quality to light.

01 \\ Integrating spheres for all applications A key issue in selecting a suitable sphere for the designated application is the maximum size of the sample to be measured. The size of the integrating sphere should increase with the size of the light source in order to keep measurement errors to a minimum. Conformity and measuring geometries Integrating spheres from Instrument Systems are in conformity with the guidelines CIE 127:2007, CIE S 025 and IES LM-79-08 in respect of concept, construction and functionality. The complete ISP series has a measuring port at the side to determine luminous...

► Integrating spheres for all applications Coating and spectral range All integrating spheres have a barium sulfate (BaSO4) coating with a reflectance of approximately 97 % in the photometric spectral range. The coating exhibits minimal ageing effects and has a particularly low fluorescence level. It covers a wide spectral range from 240 to 2600 nm. The complete model range can be used with all spectroradiometers from Instrument Systems. A fiber bundle is generally used to connect the sphere to a spectroradiometer which is optimized for the relevant spectral range. Choosing the right sphere The...

Guidelines for selecting the correct size Y 4n geometry The total surface of the test sample should be smaller than 2 % of the surface of the sphere. The length of a linear lamp should be less than 2/3 of the diameter of the sphere. Y 2n geometry The diameter of the measuring port and hence the maximum extension of the test specimen should not exceed 1/3 of the sphere diameter. The working principle Using integrating spheres to determine the radiant power or luminous flux from light sources is one of the most important procedures in light measurement. The interior surface of the hollow sphere...

► Equipment and mode of functioning ► Equipment and mode of functioning The test specimen should always be significantly smaller than the internal diameter of the sphere, in order to keep the interference factor caused by the sample itself as low as possible. However, the incident light intensity on the detector decreases as the sphere gets bigger. As a rule of thumb, the light throughput of an integrating sphere is a function of the inverse square of the sphere's radius. Selecting the correct relationship between the size of the test object and the size of the sphere is therefore crucial for...

Key features at a glance ISP 75 For standard single LEDs and LED chips 75 mm inside diameter, 15 mm measuring port Mount at the measuring port for LED test sockets Version for assembly at LED handler or wafer prober ISP 100 Optimum size for constricted space in the wafer prober 100 mm inside diameter, 33 mm measuring port Optional: Protective silica glass window for the measuring port Order number ISP 75 The ISP 75 was specially developed for characterization of standardized single LEDs and LED chips in the production environment. The 15 mm measuring port makes the ISP 75 ideal for installation...

Key features at a glance A Turnkey system for applications in the laboratory or OEM version for production applications A 150 mm inside diameter, 50 mm measuring port A Optional: Protective window or dome made of silica glass for measuring port A Optional: Auxiliary light source to compensate for self-absorption 04 \\ ISP 150L - for production and laboratory The dimensions of the ISP 150L make it ideal for production applications where space is a priority. A standalone version is supplied for use in the laboratory. A window (35 mm diameter) or alternatively a dome (36 mm diameter) made of silica...

Key features at a glance y Ideal for all single LEDs, high-power LEDs and small LED modules y 250 mm inside diameter, 75 mm measuring port y Holder for LED test sockets and TEC test adapters y Integrated auxiliary light source to compensate for self-absorption 05 \\ SP 250 – great for high-power I LEDs The ISP 250 is ideal for characterization of single LEDs, high-power LEDs and small LED clusters and modules. The diameter of 250 mm means that it provides an ideal compromise between size and precision for these applications. The ISP 250 has a default integrated 10 W auxiliary halogen light source...

► ISP 250 - great for high-power LEDs Reduction of measuring port The measuring port of the ISP 250 can be reduced to 50 mm for applications in production, such as partial LED flux. A special adapter plate is supplied with a protective disc made of silica glass which protects the BaSO4 coating against dirt and damage.

Key features at a glance y Universal for all high-power LEDs, mid-sized LED modules and small lamps y 500 mm inside diameter, 150 mm measuring port y Closed and opening version supplied with internal lamp post y Integrated auxiliary light source to compensate for self-absorption 06 \\ SP 500 – for mid-sized LED I modules The ISP 500 has been designed for accurate determination of the radiant power and luminous flux from small lamps, high-power LEDs and mid-sized LED modules. The sphere is supplied in two versions: a closed model for measurements in 2π configuration, where light is only input...

Version for 4n measurements This version of the ISP 500 can be easily opened with the swivel mechanism. It is fitted with a sample holder in the center of the sphere, which is used to mount the test specimens for measurements in the 4n configuration. Force and sense wires of a four-point measurement procedure are used to supply electricity to the sample and to measure electrical parameters. Terminals are provided on the sample holder which can be easily connected outside the sphere. The sample mount can be configured with a range of standardized plugin or screw sockets for mounting standardized...

For large LED modules, lamps and small (SSL) lamps 1000 mm inside diameter, 300 mm measuring port Optional +/- 90° rotatable version Sample platform for fixing LED modules and luminaires Lamp post for measuring light sources in a vertical or suspended position Integrated temperature sensor and integrated auxiliary light source to compensate for self-absorption The ISP 1000 has a diameter of one meter. It was specially designed for precise measurement of the radiant power and luminous flux of larger and more powerful light sources for applications in solid state lighting and for lamps in general....