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Proposed Changes to Lighting Standards Debated
February 19, 2010

American National Standards Institute (ANSI) / The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) / The Illuminating Engineering Society of North America (IESNA) Standard 90.1-2007, Energy Standard for Buildings Except Low-Rise Residential Buildings, provides minimum requirements for the energy-efficient design of buildings except low-rise residential buildings. Currently, nine proposed addenda to the standard are open for public review.

Proposed addendum by would establish revised lighting power densities for both the whole building and space-by-space compliance methods. The addendum would reduce lighting power allowances in many building and space types while maintaining industry recommended lighting levels as their basis.

Changes also are being proposed to the envelope section, including requirements for high albedo roofs. Other proposed changes to the envelope section are addenda which address glazing products. As the ratings for these products give a range of performance values, designers and code officials require an interpretation on what to use for compliance with the standard.

The proposed addenda to ANSI/ASHRAE/IESNA Standard 90.1 are available for comment only during their public review period. To read the addenda or to comment, visit

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