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Lighting Science: Concepts and Language of Lighting

Concepts and Language of Lighting

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ANSI/IES LS-2-20
Document Type: Lighting Science (LS)

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SKU: ANSI/IES LS-2-20 Category: Tag:

Product Description

Approved American National StandardLighting’s language fulfills the need to describe, specify, and evaluate luminous environments. Like any language, it is based on concepts and vocabulary. The concepts result from a consideration of the nature of light, vision, and architecture. The vocabulary results from the need for clarity, specificity, and precision. Only the most important quantities and units used in lighting design and illuminating engineering that relate directly to optical radiation, light, and vision are described and defined in this document. The technical words associated with lighting equipment, photometry, lighting calculations, color, and daylighting are defined in other documents in the IES Library, and they rely on an understanding of the material presented in this document.

Page count: 19 pages
Publisher: Illuminating Engineering Society (2020)
SKU: ANSI/IES LS-2-20
ISBN-13: 978-0-87995-011-8

Chapters:

  • 1.0 Introduction and Scope
    2.0 Language and Concepts
    3.0 Radiant Power, Radiant Flux
    4.0 Action Spectra
    5.0 Defining Light
    6.0 Luminous Flux
    7.0 Surface Flux Densities
    8.0 Spatial Flux Densities
    9.0 Light and Materials
    10.0 Other Derived Concepts
    11.0 Tabulation

CONTENTS

  • 1.0 Introduction and Scope
  • 1.1 Introduction
  • 1.2 Scope
  • 2.0 Language and Concepts
  • 2.1 General Words
  • 2.2 Radiant and Luminous Concepts
  • 2.3 Wavelength Dependencies
  • 3.0 Radiant Power, Radiant Flux
  • 3.1 Specifying Radiant Energy and Power
    3.1.1 Radiant Energy
    3.1.2 Radiant Power or Radiant Flux
    3.1.3 Spectral Power Distribution
    3.1.4 Relative Spectral Power Distribution (SPD)
  • 3.2 Data Conventions for SPDs
  • 4.0 Action Spectra
  • 5.0 Defining Light
  • 5.1 Action Spectrum for Vision
  • 5.2 Photopic Luminous Efficiency
  • 5.3 Scotopic Luminous Efficiency
  • 6.0 Luminous Flux
  • 6.1 Photopic Luminous Flux
  • 6.2 Scotopic Luminous Flux
  • 6.3 Quantity of Light
  • 6.4 Luminous Efficacy of Radiation
  • 6.5 Luminous Efficacy of a Source
  • 7.0 Surface Flux Densities
  • 7.1 Illuminance
    7.1.1 Average Illuminance
  • 7.2 Exitance
    7.2.1 Average Exitance
  • 8.0 Spatial Flux Densities
  • 8.1 Solid Angle
  • 8.2 Luminous Intensity
    8.2.1 Equivalent Luminous Intensity
  • 8.3 Luminance
  • 9.0 Light and Materials
  • 9.1 Reflectance
    9.1.1 Perfectly Diffuse Reflectance: A Useful Special Case
    9.1.2 Bidirectional Reflectance
    9.1.3 Bidirectional Reflectance Distribution Function
  • 9.2 Transmittance
    9.2.1 Perfectly Diffuse Transmittance: A Useful Special Case
    9.2.2 Bidirectional Transmittance
    9.2.3 Bidirectional Transmittance Distribution Function
  • 9.3 Absorptance
  • 10.0 Other Derived Concepts
  • 10.1 Luminance Contrast
  • 10.2 Brightness
  • 11.0 Tabulation
  • 11.1 Radiometric Units
  • 11.2 Principal Photometric Units
  • References