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LM-79-19....What's new?

It's hard to believe that it’s been more than 11 years since the original IES LM-79-08 was introduced to the lighting industry. In this time, the LED industry has seen some tremendous changes from both a technological and design perspective. The optical measurements have, for the most part, remained the same (a photon is still a photon after all), but some of the technological changes have necessitated changes in the way that solid state lighting products are operated in the test laboratory. These changes have been shown to produce more consistent results among laboratories, and more predictable results in applications. Some key areas that have changed in the 2019 version of LM-79 include:



Electrical Circuitry: Limits have been established for laboratory electrical circuitry and equipment. This is intended to improve the uniformity of the electrical measurements taken during testing – particularly when rapid transitions in current are present.
 
Angular Intervals: The language for defining the angular intervals for goniometric measurements have been more clearly defined. This includes angular measurements of chromaticity for color uniformity as well as integration.
 
Stabilization Criteria: The criteria for the stabilization of the test subject has been changed from 15-minute intervals to 10-minute intervals. When coupled with a good pre-burning process, this can help to increase efficiency in the laboratory.
 
Tolerance Intervals: Some metrics such as ambient temperature have been specified using tolerance intervals. This now defines the acceptable range in terms of the allowable deviation combined with the uncertainty of the measurement. The target values have remained the same, but the quality of the laboratory’s equipment and process has been taken into account. This should improve uniformity across laboratories.
 
LightLab International Allentown, LLC is now accredited to perform this testing. Effective immediately, all testing will be performed in accordance with LM-79-19.
 
If you have any questions about the transition, feel free to contact us.
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LightLab International Allentown, LLC · 905 Harrison St Ste 135 · Allentown, PA 18103-3160 · USA

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