DOE publishes a Caliper report and subjective study on LED PAR38 lamps – 19 Nov 2013
The US Department of Energy concluded that all 38 models of LED PAR38 lamps tested surpass halogen lamps in terms of energy efficiency. Subjective testing of some models by IES members determined that single emitters performed best.
The US Department of Energy (DOE) has published two reports on LED PAR38 retrofit lamps including an updated quantitative Caliper report on the lamps and a subjective report on light quality in which lighting designers rated various products. The Caliper report is an addendum to Report 20 in the DOE Caliper series that was initially issued in 2012, and the addendum covers six additional lamps and three additional benchmarks focused on the performance characteristics of the LEDs. The subjective report has been called Caliper 20.1 and covers the evaluation of beam quality, shadow quality, and color quality by lighting professionals.
LED PAR38 Lamps
Both of the new publications are focused on PAR38 solid-state lighting (SSL) products pictured nearby. The DOE focused on the PAR38 lamp because of the widespread popularity of that form factor in the PAR family of lamps. In actuality, the Caliper 20.1 report is the first of four additional reports that will focus on various aspects of PAR lamp performance with flicker/dimming, stress testing, and lumen/chromaticity sub-reports yet to come.
The addendum brings the number of PAR38 lamps being tested by the DOE in Round 20 testing to 38, and concludes that all of the products offer better energy efficiency than halogen lamps. Moreover, the report states that the LED PAR38 offerings now include lamps that span the broad range of beam angles of similar lamps based on legacy sources, ranging from 8° to 64° patterns, and offer the color quality attributes needed to replace the halogen incumbents.