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IES Publishes TM21-11, Useful Lifetime of LEDs

The Illuminating Engineering Society(IES) announces a new document, Projecting Long Term Lumen Maintenance of LED Light Sources (TM-21-11). The document recommends a method for projecting the lumen maintenance of LED light sources from the data obtained by the procedures found in IES document Approved Method for Measuring Lumen Maintenance of LED Light Sources (LM-80-08).  Available at www.ies.org/store