Lighting Power Reduction

Lighting makes up 12% of electricity consumption in the U.S., making it an important component of energy efficient building. LEED aims to control energy use for lighting by requiring reduced lighting density.
Thomas Rousing

Lighting power density is the watts of lighting per square foot of room floor area (W/sf). By reducing the lighting power density through better lighting design and more efficient lighting fixtures, a project can save a great deal of energy.  This is important because lighting makes up 12% of total U.S. electricity consumption.  This is a huge portion, considering that buildings use 40% of electricity in the U.S. alone.


Therefore, LEED specifically addresses lighting density in LEED ID+C 2009, Commercial Interiors.  The rating system requires reduced lighting power density in Energy and Atmosphere, Optimize Energy Performance – Lighting Power.  The intent of the credit, according to USGBC, is to “achieve increasing levels of energy conservation beyond the referenced standard to reduce environmental and economic impacts associated with excessive energy use”.


The credit requires that the project reduces the lighting power density beyond the ANSI/ASHRAE/IESNA Standard 90.1-2007 requirements.  The credit awards up to 5 points, depending on the amount of lighting power density reduction below the standard.  It awards 1 point for 15% reduction, 2 points for 20% reduction, and all the way up to 5 points for 35% reduction.


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