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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, important characterizations—such as power draw, efficacy, output, and color characteristics—must be measured more than once. In 2015 CALiPER released a report on Photometric Testing of White-Tunable Luminaires, describing how eight white-tunable luminaires were tested at Pacific Northwest National Laboratory. This data has subsequently informed a working group of the IES Testing Procedures Committee, which is attempting to standardize a procedure for this type of product. At heart, the key is balancing test burden with test accuracy: measuring performance at more points of the variable output can increase the accuracy of the reported values, but is more costly.