High-Quality Down Lighting Luminaire with 73% Overall System Efficiency
Investigating Organization
OSRAM SYLVANIA Development Inc.
Principal Investigator(s)
Robert Harrison
Subcontractor
None
Funding Source
Building Technologies Program/NETL
Award
DOE Share: $873,526; Contractor Share: $218,381
Contract Period
07/01/08 - 08/31/10
The goal of this project is to develop a highly efficient luminaire by optimizing the optical, thermal and electronic efficiencies to achieve an overall 73% efficiency in the luminaire. This means 73% of the luminous flux generated by the LED devices instant-on will be maintained in the complete LED system luminaire under steady-state conditions. The light will be mixed from multiple blue LED sources in the remote phosphor layer which emits uniform, highly efficient white light in a hemispherical lambertian emission pattern. In a second step a reflector + lens/ diffuser concept is used to redirect the light into a 60 degree emission pattern. Thermally the objective is to design a chip on board light engine using blue chips and a remote phosphor layer closely coupled to a heat sink to provide us with a 5-6 K/W system thermal impedance. Electrically the objective is to design a driver with 90% efficiency and 50 khrs lifetime matching the lifetime of the LED light engine.