MAGAZINE: LED lighting standards and guidelines are now building on a firm foundation
Standards established in 2008 are being used in guidelines such as Energy Star criteria, and many other standards are in development on a global basis, as Kevin Dowling describes. As discussed in an earlier article, 2008 is likely to be remembered as the Year of LED Standards, due to the publication of ANSI C78.377 (chromaticity), LM-79 (luminous flux) and LM-80 (lumen maintenance). This article covers further details on LM-80 as well as looking at various guidelines that call on The new standards. It also looks at the impressive array of standards that are currently in process.
LM-80: Lumen Maintenance
As discussed previously, the LM-80 standard describes the measurement of lumen maintenance of LED light sources including LED packages, modules and arrays (but not luminaires). Prediction of lifetime beyond the testing period is not included in the standard. The sidebar "LM -80 Test Report" shows the required data that must be supplied. These are all observable and measurable quantities, and no prediction or extrapolation is involved. The IESNA committee working on a new method, TM-21 "Lumen Maintenance Prediction," is addressing The committee is evaluating a number of models to funds lumen maintenance, but this is far more than just a formula.
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This article was published in the May/June 2009 issue of LEDs Magazine.
To read the full version of this article, please visit our Magazine page, where you can download FREE electronic PDF versions of all issues of LEDs Magazine.
You can also request a print copy of LEDs Magazine (available by paid subscription) and sign up for our free weekly email newsletter . About the Author Kevin Dowling is the VP of innovation at Philips Color Kinetics ( ) and has been Active in SSL for over 10 years. He founded and chairs the IES SSL Committee and the NEMA SSL Committee, and is a past Chairman of the Next Generation Lighting Industry Alliance.![]()
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LM-80: Lumen Maintenance
As discussed previously, the LM-80 standard describes the measurement of lumen maintenance of LED light sources including LED packages, modules and arrays (but not luminaires). Prediction of lifetime beyond the testing period is not included in the standard. The sidebar "LM -80 Test Report" shows the required data that must be supplied. These are all observable and measurable quantities, and no prediction or extrapolation is involved. The IESNA committee working on a new method, TM-21 "Lumen Maintenance Prediction," is addressing The committee is evaluating a number of models to funds lumen maintenance, but this is far more than just a formula.
+++++++
This article was published in the May/June 2009 issue of LEDs Magazine.
To read the full version of this article, please visit our Magazine page, where you can download FREE electronic PDF versions of all issues of LEDs Magazine.
You can also request a print copy of LEDs Magazine (available by paid subscription) and sign up for our free weekly email newsletter . About the Author Kevin Dowling is the VP of innovation at Philips Color Kinetics ( ) and has been Active in SSL for over 10 years. He founded and chairs the IES SSL Committee and the NEMA SSL Committee, and is a past Chairman of the Next Generation Lighting Industry Alliance.
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