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The U.S. Department of Energy's CALiPER program has released Report 21.1, which is part of a series of investigations on linear LED lamps. Report 21.1 focuses on the performance of 31 types of linear LED lamps operated in a typical 2x4 troffer with a K12 prismatic lens. The lamps were intended as alternatives to T8 fluorescents. Overall, many of the tested linear LED lamps provided higher luminaire efficacy than a comparable fluorescent system in a K12-lensed troffer. Given the disparity in cost between LED and fluorescent systems, the financial benefit and long-term cost savings associated with LED retrofits should be considered on a case-by-case basis. For a closer look at the findings, download the full report from the DOE SSL website.