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About
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About the IES
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IES Staff
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Information
Newsroom
Annual Report
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Membership
Join
Committees & Panels
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Events
Information
Events Calendar
Sponsorship
IES Progress Report
Featured Events
Light + Justice Symposium
IES24 Conference
Street & Area Lighting Conference
Research Symposium
Special Events
Illumination Awards & Gala
Lighting Education Tour
Aviation Lighting Conference
Research & Education
Research
About IES Research
Publications
FIRES Forum
Past Projects
IES Lighting Ready Reference App
Education
eLearning Portal
Upcoming Webinars
Request IES CEU/AIA-LUs
LC Study Group
Register Now for Our Next Webinar
Standards
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Nomenclature & Definitions
Standards Errata & Addenda
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Toolbox
IES Standards Toolbox
My Lighting Library
My Illuminance Selector
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Store
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contrast threshold
[5.9.4.6] See
brightness contrast threshold
.
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