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Lighting Science: Measurement of Light – The Science of Photometry

Measurement of Light – The Science of Photometry

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ANSI/IES LS-4-20
Document Type: Lighting Science (LS)

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SKU: ANSI/IES LS-4-20 Category: Tags: ,

Product Description

Approved American National StandardRadiometry is the science of the measurement of optical radiation, and is part of the general science of measurement, metrology. Photometry, a special branch of radiometry, is the measurement of radiation accounting for human visual response. This Lighting Science (LS) document describes the various types of photometry and photometric instrumentation, including laboratory and field equipment and measurement types, and instructions for some types of field measurements. However, it does not provide instructions or methodology for performing laboratory tests. For that kind of information, the reader is referred to the IES Lighting Measurement (LM) series of documents.

Page count: 30 pages
Publisher: Illuminating Engineering Society (2020)
SKU: ANSI/IES LS-4-20
ISBN-13: 978-0-87995-289-1

Chapters:

  • 1.0 Introduction and Scope
    2.0 Traceability, Accreditation, and Photometric Standards
    3.0 Visual Photometry
    4.0 Physical Photometry
    5.0 Absolute, Relative, and Substitution Photometry
    6.0 Instrument Accuracy
    7.0 Measuring Spectra
    8.0 Measuring Illuminance
    9.0 Measuring Luminous Intensity
    10.0 Measuring Flux
    11.0 Measuring Luminance
    12.0 Measuring Reflectance and Transmittance
    13.0 Lamp Photometry
    14.0 Luminaire Photometry
    15.0 Field Measurements

CONTENTS

  • 1.0 Introduction and Scope
  • 1.1 Introduction
  • 1.2 Scope
  • 2.0 Traceability, Accreditation, and Photometric Standards
  • 2.1 Traceability and Accreditation
  • 2.2 Photometric Standards
    2.2.1 Types of Standards

  • 3.0 Visual Photometry
  • 4.0 Physical Photometry
  • 4.1 Types of Detectors
    4.1.1 Phototubes
    4.1.2 Solid-State Detectors

  • 4.2 Detector Spectral Response
  • 4.3 Environmental Factors
    4.3.1 Temperature Effects
    4.3.2 Transient Effects
    4.3.3 Effect of Pulsed or Cyclical Variation of Light
    4.3.4 Magnetic Fields
    4.3.5 Electrical Interference
  • 5.0 Absolute, Relative, and Substitution Photometry
  • 5.1 Absolute Photometry
  • 5.2 Relative Photometry
  • 5.3 Substitution Photometry
  • 6.0 Instrument Accuracy
  • 6.1 Factors for All Instruments
    6.1.1 Spectral Correction Error, ƒ1‘
    6.1.2 Linearity Error, ƒ3
    6.1.3 Display Error, ƒ4
    6.1.4 Fatigue Error, ƒ5

  • 6.2 Illuminance Meter Cosine Response Error, f2
  • 6.3 Luminance Meter Surround Field Error, f2(u)
  • 7.0 Measuring Spectra
  • 7.1 Using Spectroradiometers
    7.1.1 Measurement of Spectral Power Distribution (SPD)
    7.1.2 Spectral Reflectance and Transmittance
  • 8.0 Measuring Illuminance
  • 8.1 Illuminance Meters
  • 8.2 Angular Response
  • 8.3 Spectral Response
  • 9.0 Measuring Luminous Intensity
  • 9.1 Optical Bench Photometry
  • 9.2 Distribution Photometry
  • 10.0 Measuring Flux
  • 10.1 Integrating Sphere
  • 11.0 Measuring Luminance
  • 11.1 Spot Luminance Meters
    11.1.1 Beam Splitter Spot Meter
    11.1.2 Aperture Mirror Photometers
  • 11.2 Digital Luminance Meters
  • 12.0 Measuring Reflectance and Transmittance
  • 12.1 Reflectometers (and Transmitometers)
  • 12.2 Field Measurement of Reflectance
  • 13.0 Lamp Photometry
  • 13.1 Characterizing Lamps
  • 13.2 Lamp Testing
  • 14.0 Luminaire Photometry
  • 14.1 Far-Field and Near-Field Photometry
  • 14.2 Absolute Luminaire Photometry
  • 14.3 Relative Luminaire Photometry
  • 14.4 Characterizing Luminaires
  • 14.5 Luminaire Photometric Testing
  • 14.6 Derived Photometric Characteristics
    14.6.1 Zonal Lumens
    14.6.2 Luminaire Efficiency and Photometric Efficiency
    14.6.3 Average Luminance
    14.6.4 Beam Type and Characterization
    14.6.5 Coefficients of Utilization
  • 15.0 Field Measurements
  • 15.1 Interior Measurements
    15.1.1 Average Illuminance
    15.1.2 Illuminance at a Point
    15.1.3 Luminance
  • 15.2 Outdoor Measurements
  • References