This study evaluated three LED products designed to directly replace linear fluorescent lamps (most commonly "T8" lamps) in commercial ambient lighting. These three products were among the "best in class" at the time of the study, as identified by DOE's CALiPER testing program.' Many similar products exist in the market and all claim energy savings relative to the targeted incumbent fluorescent systems, but few perform as well as the three selected for this study. The power reductions associated with LED T8 replacement applications are frequently accompanied by significant reductions in lumen output, making them inappropriate as retrofits for many applications but reasonable for others. Table ES.1 summarizes the results relevant to important design criteria for one representative test conducted during the study using a two-lamp prismatic lens fixture. An additional comparison included in the table examines a lower wattage (25W) fluorescent product easily purchased today that provides similar light output to the LED products. Table ES.2 provides reference characteristics for the various products considered in this comparison. In this comparison, all three LED products drew less power than their fluorescent counterparts but, like others of their kind, also provided fewer lumens on the room and work surface grids measured beneath and beside them. The prices of the LED products are such that none pay for themselves when compared to the standard T8 (735)2 fluorescent lamp used as the primary baseline in this study.
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