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More recently, DOE has focused on photometric testing of LED color-tunable products, which present a unique challenge for established methods of characterizing lighting performance because their output is continuously variable. In 2018, an Addendum expanded the luminaire testing results contained in the 2015 report on Photometric Testing of White-Tunable Luminaires. This report provided data that subsequently informed a working group of the IES Testing Procedures Committee. A draft Technical Memorandum describing recommended additional steps to the LM-79 test method to accommodate white-tunable luminaires is currently being balloted.