The U.S. Department of Energy’s testing program for solid-state lighting — CALiPER, which is short for Commercially Available LED Product Evaluation and Reporting — in 2012 found continued improvement in the performance of LED lighting products and saw evidence of a shift in the priorities of the manufacturers. DOE put out a summary report (link goes to PDF report) looking back at the CALiPER program’s findings in 2012 and how LEDs have changed since its testing ...

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