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Publication Date: 12/1/2012
Archive >  December 2012 Issue >  electronica Product Preview > 

Pocket-Size Mini Spectrometer from GL
Pocket-size spectrometer measures LEDs.
Weilheim/Teck, Germany — The GL Spectis 1.1 is the newest member of the family of handy mini-spectrometers from GL Optic — a tool that allows for a reliable spectral light measurement. Together with the handy integrating sphere GL Opti Sphere 48, available as an accessory, brightness values can be determined with a current duration of 25ms — with a very high level of precision. Designers and developers of lamps are often faced with the problem that the standard LED shipping dimensions and configurations of certain series types contain a product group, which can possibly include LEDs with different color and brightness levels. A highly precise sorting always presents a logistical challenge: even the most up-to-date LED-production facility is subject to certain deviations through the complex production process. Where LEDs are concerned, the deviation is easy to perceive through different color coordinates and brightnesses.

If you compare LEDs from different producers, developers often have the difficulty as to how the LED-quality actually corresponds with the brightness and color coordinates in accordance with the CIE-standard. LEDs also change their color and brightness with increasing temperature. Thus, the normal testing procedure only takes 25ms after the LED-production so they do not warm up. In order to be able to synchronize this "measuring frame" of 25ms exactly with the flash time, normally very extensive and expensive laboratory instruments are required.

The portable, easy-to-operate and inexpensive spectrometer GL Spectis 1.1 is used here: It can determine brightness values with a current duration of 25 ms and a precision of ±4 percent.

A special trig-out-connection emits a signal at a fixed point of time of the measurement, for example, to an external current source so that the LED illuminates exactly during the measuring period. In this way, the user can simulate the measurement conditions that existed during the manufacturer's production and development test. The mobile integrating sphere GL Opti Sphere 48 has been designed so that it reliably measures lumen values and all photometric values of not only individual LEDs, but also other small light sources. Moreover, the system simultaneously scale the spectra, thus, determining reliable values for color coordinates, CCT and CRI in accordance with the CIE-standard.

The mini-spectrometer can measure LEDs that are already on a printed board through the integrating sphere with a diameter of 48 mm. Through this, the influences of electronic construction elements, drivers and current supplies can be determined on the spectral properties of the LEDs to be measured as well as the usage of dimmers and cooling elements.

The system is suitable for measurements on lights and complete light installations, which are constructed of multiple LEDs. With this, it is possible to measure the performance of individual LEDs, and the instrument can be used for the binning of LEDs from different manufacturers according to color and brightness.

Contact: GL Optic, Just Normlicht GmbH, Tobelwasenweg 24, D73235 Weilheim/Teck, Germany +49-07023/9504-0 fax: +49-07023/9504-52 E-mail: Web:

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