Research Project Summary Information
Develop and Commercialize LED, 'Solid-State Light Engines' for Outdoor/Exterior Lighting Products(ST8893-1)
Light emitting diode (LED technology) is more efficacious and reliable than incandescent/halogen light sources in many applications. Benefits of LEDs over conventional halogen technologies for outdoor lighting applications include: the blue-green light spectrum that LEDs can produce is well-suited to human vision because the human eye is most sensitive to this spectrum and lighting tuned to blue-green can efficiently illuminate green foliage without the perception of using colored lighting; LEDs have increased operating hours; extreme durability; safety from high voltage or IR and UV emissions; and their operating life can be extended by dimming. Currently available white LEDs have not achieved the brightness required for most applications. These LEDs generate only 20 to 30 lumens per watt and do not offer significant benefits over incandescent and halogen light sources that produce 12 to 24 lumens per watt. Nevertheless, colored LEDs are more efficacious and generate 30 to 80 lumens per watt.
The goal is to design and commercialize a Solid State Light (SSL) Engine that will extract as much light as possible from LEDs while attaining electrical efficiency and reducing costs as well as providing heat sinking and flexible integration into lighting fixture designs. Specifically the project will (1) identify SSL requirements; (2) develop the electrical architecture for supporting LED configurations; (3) assemble SSL prototypes; (4) perform a cost analysis; and (5) fabricate 'alpha' units and engage five outdoor lighting manufacturers to evaluate the alpha units.
Benefits include energy savings associated with replacing incandescent/halogen light sources with LEDs.
The Contractor designed and commercialized a Solid State Light (SSL) Engine that includes heat sinking and flexible integration into existing PAR20 and PAR 30 lighting fixture designs. Specifically the project (1) identified SSL requirements; (2) developed the electrical architecture for supporting LED configurations; (3) assembled SSL prototypes; (4) performed a cost analysis; and (5) fabricated 'alpha' units and engaged five outdoor lighting manufacturers to evaluate the alpha units. The PAR 20 equivalent LED light engine, the P20 assembly, produces 310 lumens at a color temperature of 6500K and consumes a total of 9.3 Watts of power (33 lms/Watt). At 2800K, the P20 generates 200 lumens of light (20 lms/Watt) and at 4000 generates 240 lumens of light (24 lms.Watt). It is available in beam patterns of 25 degrees and 60 degrees, with color rendering index (CRI) of 75. The PAR 30 equivalent, the P30 assembly, provides 400 lumens at 4000K color temperature. At 2800K, the P30 generates 330 lumens of light (21 lms/Watt) and at 6500K will produce 500 lumens of light (31 lms/Watt). The P30 is available in beam patterns of 25 degrees and 60 degrees, with a CRI of 75.
The total overall cost of ownership of the P20 LED light engine versus an equivalent incandescent bulb will provide a 50% reduction in energy usage and a savings of 23% when replacement cost, energy and maintenance costs are considered over a five-year period.
7a Main St
Kings Park, NY 11754
Rensselaer Polytechnic Institute
NYSERDA Contact Information
R&D - Buildings Research