IES LM-79-08, Approved Method for the Electrical and Photometric Measurements of Solid-State Lighting Products, covers LED-based SSL products with control electronics and heat sinks incorporated. For more information, visit http://www.iesna.org/. 2 CALiPER only uses independent testing laboratories with LM-79-08 accreditation that includes proficiency testing, such as that available through the National Voluntary Laboratory Accreditation Program (NVLAP). 3 CALiPER application reports are

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... le at http://energy.gov/eere/ssl/caliper-application-reports. Detailed test reports for individual products can be obtained from http://www.ssl.energy.gov/search.html. 4 LED Lighting Facts® is a program of the U.S. Department of Energy that showcases LED products for general illumination from manufacturers who commit to testing products and reporting performance results according to industry standards. The DOE LED Lighting Facts program is separate from the Lighting Facts label required by the Federal Trade Commission (FTC). For more information, see http://www.lightingfacts.com. 5 ENERGY STAR is a federal program promoting energy efficiency. For more information, visit http://www.energystar.gov. This report focused on human-evaluated characteristics, including beam quality, shadow quality, and color quality. Using a questionnaire that included rank-ordering, opinions on 26 of the Report 20 PAR38 lamps were gathered during a demonstration event for members of the local IES chapter. This was not a rigorous scientific experiment, and the data should not be extrapolated beyond the scope of the demonstration. The results suggest that many of the LED products compared favorably to halogen PAR38 benchmarks in all attributes considered. LED lamps using a single-emitter design were generally preferred for their beam quality and shadow quality, and the IES members' ranking of color quality did not always match the rank-order according to the color rendering index (CRI). Report 20.2: Dimming, Flicker, and Power Quality Characteristics of LED PAR38 Lamps (March 2014) 9 This report focused on the flicker and power quality performance of the Series 20 lamps at full output and various dimmed levels. All of the Series 20 PAR38 lamps that manufacturers claimed to be dimmable (including all halogen lamps) were evaluated individually (one lamp at a time), both on a switch and under the control of a phase-cut dimmer designed for use with "all classes of bulbs." Measurements of luminous flux, flicker, and power quality were taken at 10 target dimmed settings and compared with operation on a switch. The dimmed performance of many LED lamps is dependent on the phase-cut dimmer used and the number of lamps that are connected to the dimmed circuit. Some manufacturers recommend specific dimmers that work better with their product(s), as well as the minimum and maximum number of dimmers per circuit. Because only a single unit of each product was evaluated on a single dimmer make and model, which may or may not have been recommended by its manufacturer, this report focuses on the performance of the products relative to each other, rather than on the best-case performance of each lamp or variation in performance delivered from each lamp. Despite these limitations, the results suggest that LED performance is improving, and performance trends are beginning to emerge, perhaps due in part to the identification of preferred LED driver strategies for lamp products.