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Publication Citation: Luminous Intensity of LEDs at NIST

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Author(s): Carl C. Miller; Yoshihiro Ohno;
Title: Luminous Intensity of LEDs at NIST
Published: October 01, 2001
Abstract: Calibration facilities and procedures for measurement of Averaged LED intensity using the detector-based method have been developed at the National Institute of Standards and Technology (NIST). The scale has been established on two standard photometers calibrated for the required geometries. The current facility utilizes the existing NIST photometric bench and specific LED alignment procedures. The uncertainties of the calibration of the standard photometers as well as for the calibration of LEDs are analyzed in detail. Calibration services are now available for Averaged LED Intensity with a relative expanded uncertainty (k=2) ranging from 0.8% to 3% (dependeing on the LED characteristics) and for LED standard photometers for the CIE conditions A and B with an unceratinty of 0.7% and 0.9%, respectively.
Conference: CIE Expert Symposium on LED Measurement
Proceedings: Proceedings of the CIE 2nd Expert Symposium on LED Measurement
Dates: May 10-12, 2001
Keywords: average LED intensity;calibration standard;led;luminous intensity
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