ASHRAE Journal - September 2023 - 44

TECHNICAL FEATURE
Lighting Changes in
ASHRAE/IES
Standard 90.1-2022
BY MICHAEL MYER; KELLY SEEGER, ASSOCIATE MEMBER ASHRAE
Many elements related to lighting were made in the 2022 edition of ANSI/ASHRAE/IES
Standard 90.1, Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings.
The updated standard saves energy via reduced lighting power values, expanded
control requirements and expansion of its scope to cover more exterior lighting
applications such as walkways on campuses and parking lots that serve building
occupants but that are not powered by a building electrical service. The updated
standard also introduces efficiency requirements for horticultural lighting.
Scope Expansion
One of the most significant changes affecting
lighting in Standard 90.1-2022 was the expansion of
the standard's scope from buildings to buildings and
building sites. The scope in previous versions of the
standard was limited to buildings and the related
exterior areas directly connected to the building. This
meant lighting powered via electrical service, e.g.,
the parking lot, was covered only if it was powered by
the building's electrical service. Any parking lots or
other exterior areas such as walkways not powered by
a building were not in scope. However, many exterior
lighting applications are not directly powered by
the building's electrical service. Common examples
include lighting on a campus powered by a central
plant, lighting between buildings, plazas or even
parking lot lighting where the lighting is powered by
the utility.
This scope change does not modify other aspects of
the prescriptive lighting requirements. The new scope
addresses exterior areas that may be in a " gray zone " of
coverage. Beyond reducing this " gray zone, " additional
energy savings are achieved because new spaces that
were not previously covered are now covered by the
standard.
Horticultural Lighting
Another important inclusion is mandatory efficiency
requirements (Section 9.4.4) for horticultural lighting
(addendum ar). The proliferation of indoor-grow
Michael Myer is a senior researcher at Pacific Northwest National Laboratory. Kelly Seeger is the technical policy director at Signify North America Corporation.
44
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ASHRAE Journal - September 2023

Table of Contents for the Digital Edition of ASHRAE Journal - September 2023

Table of contents
ASHRAE Journal - September 2023 - Intro
ASHRAE Journal - September 2023 - Cover1
ASHRAE Journal - September 2023 - Cover2
ASHRAE Journal - September 2023 - 1
ASHRAE Journal - September 2023 - Table of contents
ASHRAE Journal - September 2023 - 3
ASHRAE Journal - September 2023 - 4
ASHRAE Journal - September 2023 - 5
ASHRAE Journal - September 2023 - 6
ASHRAE Journal - September 2023 - 7
ASHRAE Journal - September 2023 - 8
ASHRAE Journal - September 2023 - 9
ASHRAE Journal - September 2023 - 10
ASHRAE Journal - September 2023 - 11
ASHRAE Journal - September 2023 - 12
ASHRAE Journal - September 2023 - 13
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ASHRAE Journal - September 2023 - Cover3
ASHRAE Journal - September 2023 - Cover4
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