Skip to main content
Skip to footer
About
Our Organization
About the IES
Diversity & Inclusion
Society Awards
Administration
IES Staff
IES Board
IES Committees
Information
Newsroom
Annual Report
Resources
Membership
Membership
Join
Sustaining Membership
Emerging Professionals
IES Committees
University Program
Grants & Scholarships
Section Directory
Section Resources
Global Access Affiliate Program
Volunteer Opportunities
Philanthropic Donations
Events
Information
Events Home
Events Calendar
Sponsorship
Featured Events
IES25 The Lighting Conference
SALC 2025
Special Events
Light for Life® Virtual Symposium: Security
Lightfair 2025
Illumination Awards & Gala
Research & Education
Research
About IES Research
Publications
FIRES
Past Projects
Education
eLearning Portal
Upcoming Webinars
Request IES CEU/AIA-LUs
LC Study Group
Education FAQs, Forms & Guidelines
Register Now for Our Next Webinar
Standards
Standards
Purchase Standards
Browse Library of Lighting Standards
Nomenclature and Definitions
Join a Technical Committee
Information
Standards Newsletter
IES Standards Process
Continuous Maintenance Form
IES Standards in Public Review
Toolbox
IES Standards Toolbox
My Lighting Library
My Illuminance Selector
My Reference Retriever
LD+A
Store
About
Our Organization
About the IES
Diversity & Inclusion
Society Awards
Administration
IES Staff
IES Board
IES Committees
Information
Newsroom
Annual Report
Resources
Membership
Membership
Join
Sustaining Membership
Emerging Professionals
IES Committees
University Program
Grants & Scholarships
Section Directory
Section Resources
Global Access Affiliate Program
Volunteer Opportunities
Philanthropic Donations
Events
Information
Events Home
Events Calendar
Sponsorship
Featured Events
IES25 The Lighting Conference
SALC 2025
Special Events
Light for Life® Virtual Symposium: Security
Lightfair 2025
Illumination Awards & Gala
Research & Education
Research
About IES Research
Publications
FIRES
Past Projects
Education
eLearning Portal
Upcoming Webinars
Request IES CEU/AIA-LUs
LC Study Group
Education FAQs, Forms & Guidelines
Register Now for Our Next Webinar
Standards
Standards
Purchase Standards
Browse Library of Lighting Standards
Nomenclature and Definitions
Join a Technical Committee
Information
Standards Newsletter
IES Standards Process
Continuous Maintenance Form
IES Standards in Public Review
Toolbox
IES Standards Toolbox
My Lighting Library
My Illuminance Selector
My Reference Retriever
LD+A
Store
Donate
Join
Sign In
Search the IES Website
Search
×
About
Our Organization
About The IES
Diversity & Inclusion
Society Awards
Administration
IES Staff
IES Board
IES Committees
Information
Newsroom
Annual Report
Resources
Membership
Membership
Join
Sustaining Membership
Emerging Professionals
IES Committees
University Program
Grants & Scholarships
Section Directory
Section Resources
Global Access Affiliate Program
Volunteer Opportunities
Philantropic Donations
Events
Information
Events Home
Events Calendar
Sponsorship
Featured Events
IES25 The Lighting Conference
SALC 2025
Special Events
Lightfair 2025
Light for Life® Virtual Symposium
Illumination Awards & Gala
Research & Education
Research
About IES Research
Publications
FIRES
Past Projects
Education
eLearning Portal
Upcoming Webinars
Request IES CEU/AIA-LUs
LC Study Group
Education FAQs, Forms & Guidelines
Standards
Standards
Purchase Standards
Browse Library of Lighting Standards
Nomenclature & Definitions
Join a Technical Committee
Information
Standards Newsletter
IES Standards Process
Continuous Maintenance Form
IES Standards in Public Review
Toolbox
IES Standards Toolbox
My Lighting Library
My Illuminance Selector
My Reference Retriever
LD+A
Store
Donate
Join
Sign In
Donate
Join
Sign In
Search the IES Website
Search
×
erythemal unit (EU)
[12.1.2.11] (See
erythemal flux
.)
« Back to Definitions Index
Access My IES
My Library
eLearning Portal
Illuminance Selector
Membership Directory
