Eliminating LED Measurement Errors
Recent surveys and discussions indicate that a prime concern of the LED measurement industry is the high levels of uncertainties and inconsistencies found in measurement results. Much of these uncertainties and inconsistencies are associated with poor design of measurement fixtures and accessories used in performing the measurements.
The recommended measurement of LEDs is described in CIE Publication 127. In this publication, the exact conditions for measuring averaged LED intensity and total flux are described. At the time of the CIE publication, it was envisioned that photometers and broadband radiometers would be used, thus the recommended techniques addressed errors associated with using these types of instruments. Recently, CCD based spectroradiometers are becoming more common for performing LED measurements, and the measurement uncertainties and inconsistencies found inherent in these measurement systems have arisen.
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