Edmund Optics unveils modular LED test system

June 1, 2007
Edmund Optics has announced a modular light-emitting-diode (MLED) test and measurement system.

Barrington, NJ--Edmund Optics has announced a modular light-emitting-diode (MLED) test and measurement system. Available in three configurations for discrete LEDs, arrays, and assemblies, MLED test systems offer complete spectral measurements in compliance with CIE-127 design requirements. Data acquisition through a built-in USB port provides spectral, color, power, lumens, purity, and peak-dominant-wavelength information.

The MLED base system consists of a 2048-element CCD spectrometer, an internal calibration lamp with power supply, and a set of three calibrated neutral-density filters to extend the system's dynamic range. The unit also includes a Condition B intensity tube for ILEDB, 10 cm (0.01sr) CIE-compliant measurement of luminous intensity, spectral intensity, and all derived colorimetric information. The calibration lamp, traceable to NIST standards, is characterized for spectral flux and provides users with a simple, in-house method for system recalibration.

The CCD spectrometer has a resolution of 1.5 nm, with 0.5 nm accuracy over a range of 350 to 1000 nm. The detector is capable of measuring luminous flux to 200 lumens using the OD2 filter and measuring luminous intensity using the Condition B tube. Exposure time ranges from 5 ms to 3 s, while stray light is 0.05% at 600 nm. LED socket holders, sold separately, are required for making intensity measurements

The base unit (MLED-2) includes a 2-inch-diameter integrating sphere with a ½-inch-diameter input port for making measurements on discrete devices. The MLED-6 system includes the MLED-2 along with a 6-inch integrating sphere assembly to which the base unit mounts. The MLED-6 is used for intensity measurements of high-power LEDs and for flux measurements of LED assemblies up to 1.5 inches in diameter and is designed for external mounting of samples.

The MLED-12 system consists of the MLED-2 base and a 12-inch integrating sphere with a 4-inch-diameter port. The sphere includes a prewired post with sample holder that can connect with the user's power supply to power internally mounted samples. Samples can also be placed externally at the sphere's port. The MLED-12 is ideal for flux measurements of larger LED assemblies and arrays.

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