Energy Standard for Buildings Except Low-Rise Residential Buildings – IP Edition Section 9 Lighting Only
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ANSI/ASHRAE/IES-90.1-2025-Lighting Only
Available as a downloadable secure PDF only.
To stay current with all IES standards, we recommend subscribing to the The Lighting Library as an Individual or through your company as a Sustaining Member.
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Product Description
ANSI/ASHRAE/IES 90.1 is a national voluntary consensus Standard. This document is a direct excerpt of Section 9 (lighting), as developed by the ASHRAE 90.1 Lighting Subcommittee, which consists primarily of IES members. This Standard is under continuous maintenance and is published every three years under the policies and procedures of ASHRAE, as the primary Standards Development Organization. Section 9 sets energy usage limits and control requirements for lighting. The lighting power allowance is expressed in
watts per square foot allowed for specific applications. Exemptions are cited for some types and applications of lighting.
The method was updated for the 2022 version and now aligns with IES recommendations to ensure that quality lighting design can be accomplished at the allowances cited in this document.
Page count: 44 pages
Publisher: Illuminating Engineering Society (2026)
SKU: ANSI/ASHRAE/IES-90.1-2025-Lighting Only
ISBN: 978-0-87995-522-9
Previous edition: 90.1-22
Citation Format:
Illuminating Engineering Society. ANSI/ASHRAE/IES-90.1-2025-Lighting Only, Energy Standard for Buildings Except Low-Rise Residential Buildings – IP Edition Section 9 Lighting Only. New York: IES; 2026.