High Quality Down Lighting Luminaire with 73% Overall System Efficiency Page: 3 of 13
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DE-FC26-08NT01582 Final Report
This report summarizes work to develop a high flux, high efficiency LED-based downlight at OSRAM SYLVANIA
under US Department of Energy contract DE-FC26-08NT01582. A new high power LED and electronic driver were
developed for these downlights. The LED achieved 100 lumens per watt efficacy and 1700 lumen flux output at a
correlated color temperature of 3500K. The driver had 90% electrical conversion efficiency while maintaining
excellent power quality with power factor >0.99, and total harmonic distortion <10%. Two styles of downlights
using the LED and driver were shown to exceed the project targets for steady-state luminous efficacy and flux of 70
lumens per watt and 1300 lumens, respectively. Compared to similar existing downlights using compact
fluorescent or LED sources, these downlights had much higher efficacy at nearly the same luminous flux.2
OSRAM SYLVANIA
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Harrison, Robert; Allen, Steven C.; Bernier, Joseph & Harrison, Robert. High Quality Down Lighting Luminaire with 73% Overall System Efficiency, report, August 31, 2010; United States. (https://digital.library.unt.edu/ark:/67531/metadc832786/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.