In this project, upright freezer cases were retrofitted with LED striplights combined with occupancy sensors, and compared against standard fluorescent lighting on the opposite side of the aisle. Key findings include:
- Total energy savings (including more efficient light source, reduced consumption from occupancy sensors, reduced demand on the compressor, and reduced illumination levels) is estimated to be 2,659 kWh per year for a typical 5-door case. The reduction in illumination was pre-approved by the site in order to bring down the first cost of the installation.
- Calculated simple payback from energy savings alone was approximately six years; maintenance savings were estimated to further reduce the payback to just over five years; and potential area rebates and tax credits could further reduce the payback period to less than two years.
Summary results from Round 9 of CALiPER testing
DOE has completed Round 9 of product testing through its Solid-State Lighting (SSL) CALiPER program. A summary report containing the results from Round 9 testing is now available for download on the DOE SSL website at www.ssl.energy.gov/reports.html.
Round 9 of product testing focused primarily on recessed downlights; 2x2-foot troffers and flat panel luminaires; 4-foot linear replacement lamps; and small replacement lamps including MR16, PAR, and R lamps, A-lamps, and candelabras. An SSL desk lamp was also tested.