Approved Method: Photometric Testing of Indoor Fluorescent Luminaires

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ANSI/IES LM-41-20 (R2023)
Document Type: Lighting Measurement and Testing (LM)

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SKU: ANSI/IES LM-41-20 (R2023) Category:

Product Description

Approved American National StandardLearn how to evaluate the performance of fluorescent luminaires for general lighting. Learn uniform methods for determining and reporting the photometric characteristics of indoor fluorescent luminaires, as well as general test conditions and the testing procedure best suited for achieving accurate and consistent photometric results.

Page count: 16 pages
Publisher: Illuminating Engineering Society (2023)
SKU: ANSI/IES LM-41-20 (R2023)
ISBN-13: 978-0-87995-207-5

Chapters:

  • 1.0 Introduction and Scope
    2.0 Normative References
    3.0 Definitions
    4.0 Ambient and Physical Conditions
    5.0 Electrical Conditions and Instrumentation
    6.0 Test Requirements
    7.0 Photometric Test Procedures
    8.0 Test Reports
    9.0 Additional Reading

Citation Format:
Illuminating Engineering Society. ANSI/IES LM-41-20 (R2023), Approved Method: Photometric Testing of Indoor Fluorescent Luminaires. New York: IES; 2023.

CONTENTS

  • 1.0 Introduction and Scope
  • 1.1 Introduction
  • 1.2 Scope
  • 2.0 Normative References
  • 2.1 ANSI C78.375A-2014
  • 2.2 ANSI C78.81-2016
  • 2.3 ANSI C82.3-2016
  • 2.4 ANSI/IES LS-1-20
  • 2.5 ANSI/IES LM-9-20/R23
  • 2.6 ANSI/IES LM-54-20
  • 3.0 Definitions
  • 4.0 Ambient and Physical Conditions
  • 4.1 General
  • 4.2 Temperature
  • 4.3 Air Movement
  • 5.0 Electrical Conditions and Instrumentation
  • 5.1 Wave Shape
  • 5.2 Voltage Regulation
  • 5.3 Power Source Impedance
  • 5.4 Instrumentation for Electrical Measurements
    • 5.4.1 Uncertainties
  • 6.0 Test Requirements
  • 6.1 Selection and Preparation of Luminaire
  • 6.2 Luminaire Luminance Characteristics
  • 6.3 Test Lamps
    • 6.3.1 Special Considerations for Luminaires with Compact Fluorescent Lamps (CFLs)
    • 6.3.2 Lamp Transfer
    • 6.3.3 Lamp Seasoning
  • 6.4 Photometric Equipment
    • 6.4.1 The Goniophotometry System
    • 6.4.2 Photometer
    • 6.4.3 Automated Goniophotometer
    • 6.4.4 Photometer Head (Photodetector)
  • 6.5 Luminaire Mounting
  • 6.6 Lamp Circuit Connections
  • 6.7 Stray Light
  • 6.8 Luminaire or Lamp – Pre-burning and Stabilization
    • 6.8.1 Pre-burning
    • 6.8.2 Stabilization
  • 7.0 Photometric Test Procedures
  • 7.1 Test Distance
  • 7.2 Position Sensitivity
  • 7.3 Calibration of Photometer – Relative and Absolute Photometry
    • 7.3.1 Relative Photometry – Calibration Factor
    • 7.3.2 Relative Photometry – The Calibration Process
    • 7.3.3 Relative Photometry – Special Considerations When Testing Lamps That Produce Maximum Light Output in an Ambient Temperature Other Than 25 °C
    • 7.3.4 Absolute Photometry
  • 7.4 Ballast Factor
    • 7.4.1 Ballast Factor Defined
    • 7.4.2 Determination of Ballast Factor
    • 7.4.3 Effect of Ballast Factors on Photometric Test Results
    • 7.4.4 Application of Ballast Factors
  • 7.5 Luminaire Photometry
    • 7.5.1 Mounting
    • 7.5.2 Position of Luminaire during Test
    • 7.5.3 Angles for Measurement
    • 7.5.4 Planes for Measurement
    • 7.5.5 Polarization Measurements
  • 7.6 Luminance Measurements
  • 7.7 Computation of Luminous Intensity Distribution Test Results
  • 7.8 Computing Zonal Lumens
  • 7.9 Overall Luminaire Efficiency
  • 7.10 Coefficients of Utilization
  • 8.0 Test Reports
  • 9.0 Additional Reading