Approved Method: Total Luminous Flux Measurement of Lamps Using an Integrating Sphere Photometer

Total Luminous Flux Measurement of Lamps Using an Integrating Sphere Photometer

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ANSI/IES LM-78-20
Document Type: Lighting Measurement and Testing (LM)

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SKU: ANSI/IES LM-78-20 Category: Tag:

Product Description

Approved American National StandardThis document describes the procedures to be followed and precautions to be observed in performing reproducible measurements of total flux of lamps and luminaires using integrating sphere measurement systems. Two types of integrating sphere systems are presented, one employing a V(λ)-corrected photometer head, and another employing a spectroradiometer as the detector. In addition to the specifics of the two measurement systems, the common qualities and measurement techniques are discussed along with calibration and uncertainty analysis considerations.

Page count: 21 pages
Publisher: Illuminating Engineering Society (2020)
SKU: ANSI/IES LM-78-20
ISBN-13: 978-0-87995-217-4

Chapters:

  • 1.0 Introduction and Scope
    2.0 Normative References
    3.0 Nomenclature and Definitions
    4.0 Physical and Environmental Test Conditions
    5.0 Integrating Sphere Equipment
    6.0 Calibration Standards
    7.0 Test Procedures
    8.0 Uncertainty Evaluation
    9.0 Maintenance of Integrating Spheres

Citation Format:
Illuminating Engineering Society. ANSI/IES LM-78-20, Approved Method: Total Luminous Flux Measurement of Lamps Using an Integrating Sphere Photometer. New York: IES; 2020.

CONTENTS

  • 1.0 Introduction and Scope
  • 1.1 Introduction
  • 1.2 Scope
  • 2.0 Normative References
  • 3.0 Nomenclature and Definitions
  • 3.1 total luminous flux
  • 3.2 sphere efficacy
  • 3.3 sphere responsivity
  • 4.0 Physical and Environmental Test Conditions
  • 5.0 Integrating Sphere Equipment
  • 5.1 Integrating Sphere Geormetry: 4π
  • 5.2 Integrating Sphere Geormetry: 2π
  • 5.3 Sphere Coating
  • 5.4 Baffle
  • 5.5 Auxiliary Lamp
  • 5.6 Photometer Detection
  • 5.7 Spectroradiometer Detection
  • 5.8 Lamp Holder and Mounting Hardware
  • 5.9 Temperature Sensor
  • 5.10 Electrical Circuits
  • 6.0 Calibration Standards
  • 6.1 Incandescent Standard Lamps
  • 6.2 Incandescent Reflector Lamps
  • 6.3 Discharge Standard Lamps
  • 6.4 Solid-State Lighting Standard Products
  • 6.5 Handling of Standards Lamps
  • 6.6 Operation of Standard Lamps
  • 7.0 Test Procedures
  • 7.1 Total Luminous and Total Spectral Spectral Radiant Flux Calibration
    7.1.1 Integrating Sphere with Photometer
    7.1.2 Integrating Sphere with Spectroradiometer
  • 7.2 Test Lamp Measurement Procedure
    7.2.1 Integrating Sphere with Photometer
    7.2.2 Integrating Sphere with SpectroRadiometer
  • 7.3 Sources of Error
    7.3.1 Self-Absorption
    7.3.2 Spectral Mismatch
    7.3.3 Sphere Angular Non-uniformity
    7.3.4 Near-Field Absorption
    7.3.5 Temperature Effects
  • 8.0 Uncertainty Evaluation
  • 9.0 Maintenance of Integrating Spheres
  • Informative References
  • Annex A – Basic Integrating Sphere Theory
  • Annex B – Measurement of the Relative Spectral Throughput of an Integrating Sphere
  • Annex C – Correction for the Angular Non-uniformity Errors of an Integrating Sphere
  • Annex D – Alternative Geometries and Calibration Methods