ANSI/IES LS-1-25, Lighting Science: Nomenclature and Definitions for Illuminating Engineering

The IES defines illumination engineering terms in ANSI/IES LS-1-25, is available here online. You can search terms by their first letter using the categories listed in the Categories window, by the first letter of the term in the alphabetical list below, or by typing the term in the search window. You can find the Introduction material for LS-1-25 on these pages:

•   Copyright, Disclaimer, and American National Standards Statement
•   Preface, Nomenclature Committee members, Introduction, and Scope
•   Spectral Parameters Used in Illumination Engineering

Search: Search (clear)

All Categories [10.0] Interior Lighting Applications    [10.5] Daylighting [11.0] Exterior Lighting Applications [12.0] Nonlighting Applications of Radiant Power [13.0] Lighting Controls [2.0] Electromagnetic Radiation [3.0] Light [4.0] Color [5.0] Visual Terms [6.0] Light Sources [7.0] Surfaces and Media for Light Control [8.0] Testing Procedures [9.0] Lighting Calculations [A] Annexes [T] Tables

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Results: 19

• w

• wall direct radiation coefficient, WDRC
• wall pocket
• wall reflected radiation coefficient, WRRC
• warm-up time
• wash
• Weber's fraction
• wide-angle diffusion
• wide-angle luminaire
• width line
• Wien displacement law
• Wien radiation law
• window
• window sash
• window shades
• wing clearance lights
• working standard
• work light
• work plane
• wrong way “law”