Standardisation requirements and safety concerns drive developments in LED test and measurement

April 19, 2006
As measurements and standards catch up with the explosive growth in the development of LEDs, the UK's National Physical Laboratory is well placed to advise on best practice in measurement, and to carry out accurate and traceable measurements.
The rapid rate at which LEDs have entered and become ubiquitous in the lighting market has presented industry, R&D and regulatory bodies with a number of measurement challenges. LEDs are already replacing incandescent lighting in many scenarios and are currently being developed for specialised applications such as combined brake and indicator lights in the automotive industry. They are also being used in more safety-critical areas including railway signalling and medical phototherapy.

LEDs now come in a wide variety of wavelengths (UV through the visible to IR), brightness values (for example 140 lm flux from a single green LED produced by Lumileds and formats (single packaged LEDs, multiple LEDs in clusters, and even novel technology including LED backlights and organic LEDs). It has been shown that differences in inter-industry measurements are still large and yet it is necessary to measure LEDs in a precise, accurate, well-defined and, we would say, traceable manner.


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