LGS 1000 - Goniophotometer for light measurement on a large scale
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Instrument description Measurement options | Spatial radiation patterns | Luminous flux integration | Specifications Key features at a glance Goniophotometer with C, coordinate system for large LED modules, lamps and luminaires For samples up to 2 m in diameter and 50 kg weight Accessible steps facilitate mounting of samples Precise determination of photometric, spectroradiometric, and colorimetric quantities Innovative correction procedure for positionsensitive samples Light measurement – on a large scale The LGS 1000 is ideal for the analysis of angle-dependent spatial radiation...

Sample table and electrical connection The LGS 1000 accommodates samples up to a diameter of 2 m and a maximum weight of 50 kg. The sample table measures 210 mm x 210 mm and can easily be reached using accessible steps on the goniometer. It is fitted with 3 x 3 size 6 grooves. Different thread inserts and fitting bushes facilitate reproducible and safe fixing of the test specimen. This allows easy and quick mounting of customer-specific sample holders. The LGS Controller is integrated in a separate 19” rack and serves as driver of the goniometer. It controls the automated sequences as well...

Instrument description Measurement options Spatial radiation patterns | Luminous flux integration | Specifications The entire world of measurement options The goniometer unit can be used with a spectroradiometer or a photometer to suit the specific measurement task to be performed. This combination is recommended by the relevant guidelines for precise measurements of solid-state lighting products. Spectroradiometric measurements A spectroradiometer is essential for spectral characteristics such as CRI and color coordinates. The large dynamic range makes the array spectrometers in the CAS...

Accessories for test setups Instrument Systems supplies a separate stand with a holder for a stray light tube in order to arrange flexibly configurable test setups. The tube minimizes undesired extraneous light and is supplied in two different versions. A tube with ±4.5° viewing angle was developed for measurements of the luminous intensity distribution curve in the far field. A version with a ±30° opening angle is supplied for luminous flux measurements in the near field. The tube can be easily aligned and correctly positioned on the optical axis of the test specimen with the assistance of...

Instrument description | Measurement options Spatial radiation patterns Luminous flux integration | Specifications Measurement of photometric and colorimetric spatial radiation patterns The angle-dependent measurement of photometric parameters is extremely important for the lighting industry. Comprehensive optical characterization of SSL products in particular include measurements of luminous intensity and illuminance distributions, as well as analyzing any potential angular variation in the correlated color temperature or color coordinates. Instrument Systems supplies a wide range of...

The LGS 1000 is operated via the goniometer module of the SpecWin Pro software. Two measurement processes are available, the sequence mode and the measurement series mode. In the sequence mode, the spatial radiation pattern of the test specimen is recorded at specific angular increments on both axes (gamma and C). The angular range and the increments can be independently determined. However, the complete measurement is always carried out at the same intervals. The measuring series mode, on the other hand, permits measurements to be carried out in any definable angle sequence. Larger and...

Instrument description | Measurement options | Spatial radiation patterns Luminous flux integration Specifications Goniophotometric luminous flux integration – versatile and very precise The most precise method for measuring radiant power or luminous flux is provided by integration of radiant intensity or luminous intensity using a goniophotometer. This is the method of choice for the leading national metrology institutes. It is the baseline for calibrating luminous flux standard lamps which provide the reference values for other test procedures. A goniophotometer is cost-effective if the...

Measurement of luminous flux in standard configuration The LGS 1000 can be used to measure the luminous flux even in standard configuration. The luminous flux is calculated from any measured sequence. An additional near-field stray light tube is supplied that permits fast measurements for applications where only luminous flux is important. The tube has a field of view of ±30° and can therefore be positioned very close to the goniometer while also guaranteeing full coverage even for large test specimens. In addition, it ensures efficient suppression of undesired stray light. The luminous...

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