LED Indoor Wall Wash Luminaires
Indoor Wall Wash Lighting: LED vs. Fluorescent
Luminaires for decorative lighting and highlight, or washing walls, of interior spaces with white, colored or color- changing light.
Item ID: 404
Indoor wall wash lighting is an application where LED products are gaining traction. These wall wash lights are designed for decorative lighting of interior walls. Because of the directionality of LED light sources, LED wall wash lighting can accurately and efficiently illuminate the desired area.
Indoor wall wash lighting systems employing LED technology are available from a number of manufacturers. The U.S. Department of Energy (DOE) is encouraging research, development and market penetration of the technology and is providing resources for objective, ongoing information about the technology. The Design Lights Consortium includes a category for LED wall lighting.
Energy savings over traditional wall wash lighting using fluorescent and incandescent sources may be significant depending on design light levels and fixture efficiency. Lamp life could be significantly longer than other systems in use, potentially providing maintenance savings that can be significant for commercial applications. The white light is available in a range of color temperatures and high CRI suitable for architectural lighting uses, and colored light is also available. Light distribution can be precisely controlled in well-designed luminaires by taking advantage of the inherent directionality of LED sources. Additionally, the DOE predicts continued improvement in efficacy and decline in price for LED lighting.
Baseline Description: 32W 4-ft. fluorescent wall wash fixture
Baseline Energy Use: 0.15 kWh per year per square foot
Based on a 32W 4-ft. fluorescent wall wash fixture at 80 lpw, serving 640 sf. (one fixture for every 640 sf of office or classroom floor area). Operating 3000 hrs. per year.
Manufacturer's Energy Savings Claims:
Currently no data available.
Best Estimate of Energy Savings:
"Typical" Savings: 70%
Energy Savings Reliability: 6 - Approved Measure
Savings range 50-90%. Assumes changing current lighting to LED. This is already in the BPA Lighting Calculator, so we rated ESR 6.
Energy Use of Emerging Technology:
kWh per square foot per year
Energy Use of an Emerging Technology is based upon the following algorithm.
Baseline Energy Use - (Baseline Energy Use * Best Estimate of Energy Savings (either Typical savings OR the high range of savings.))
Potential number of units replaced by this technology:
Assume applicability in offices & schools: 700 million sq ft Commercial Building Stock Assessment, NEEA, 2009 http://neea.org/resource-center/regional-data-resources/commercial-building-stock-assessment
Note: the 2009 CBSA indicates a total office and school square footage (heated floor area) of 456.4 and 262.9 million sf (total of 719.3 million sf). Table C-GB-1.
Regional Technical Potential:
0.07 TWh per year
Regional Technical Potential of an Emerging Technology is calculated as follows:
Baseline Energy Use * Estimate of Energy Savings (either Typical savings OR the high range of savings) * Technical Potential (potential number of units replaced by the Emerging Technology)
Currently no data available.
Simple payback, new construction (years): N/A
Simple payback, retrofit (years): N/A
Cost Effectiveness is calculated using baseline energy use, best estimate of typical energy savings, and first cost. It does not account for factors such as impacts on O&M costs (which could be significant if product life is greatly extended) or savings of non-electric fuels such as natural gas. Actual overall cost effectiveness could be significantly different based on these other factors.