Approved Method: Optical and Electrical Measurements of Solid-State Lighting Products | An American National Standard | ANSI/IES LM-79-24 | IES (Illuminating Engineering Society)

Optical and Electrical Measurements of Solid State Lighting Products

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ANSI/IES LM-79-19
Document Type: Lighting Measurement and Testing (LM)

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SKU: ANSI/IES LM-79-19-1 Category: Tag:

Product Description

Approved American National StandardIntended Audience: Manufacturers, testing laboratories, end users
Intended Interest Categories: Specifier (US), Affected (UA), Public Interest (UP), Academic, Research (GAR), Government, Regulatory (GGR), General SME (GSME), Organizational (OM), Testing Equipment Users (TEU), Testing Equipment Manufacturers (TEM).

Description: Procedures to be followed and precautions to be observed in performing reproducible accurate measurements of total luminous, radiant, or photon flux; electrical power; system efficacy; luminous, radiant, or photon intensity distribution; and color quantities and/or spectrum of solid-state lighting (SSL) products for illumination purposes, under standard conditions. Changes have been made in this new edition to update information and provide better guidance based on information gathered from proficiency testing associated with laboratory accreditation and independent research

Page count: 20 pages
Publisher: Illuminating Engineering Society (2024)
SKU: ANSI/IES LM-79-24
ISBN-13: 978-0-87995-483-3

Chapters:

  • 1.0 Introduction and Scope
    2.0 Normative References
    3.0 Definitions
    4.0 Physical and Environmental Test Conditions
    5.0 Electrical Test Conditions
    6.0 Test Preparation
    7.0 Total Luminous Flux and Integrated Optical Measurements
    8.0 Luminous Intensity or Optical Angular Distribution Measurement
    9.0 Chromaticity Uniformity Measurements
    10.0 Measurement Uncertainty
    11.0 Reporting Requirements

Citation Format:
Illuminating Engineering Society. ANSI/IES LM-79-24, Approved Method: Optical and Electrical Measurements of Solid State Lighting Products. New York: IES; 2024.

CONTENTS

  • Foreword
  • 1.0 Introduction and Scope
  • 1.1 Introduction
  • 1.2 Scope
  • 2.0 Normative References
  • 2.1 ANSI/IES RP-16-17
  • 2.2 IES LM-78-17
  • 2.3 IES LM-75-01/R12
  • 3.0 Definitions
  • 3.1 acceptance interval
  • 3.2 current crest factor
  • 3.3 tolerance interval
  • 4.0 Physical and Environmental Test Conditions
  • 4.1 General
  • 4.2 Temperature
    4.2.1 Ambient Temperature
    4.2.2 Measurement of Light Engine Temperature
  • 4.3 Airflow
  • 4.4 Thermal Conditions for Mounting SSL Products
  • 4.5 Vibration
  • 4.6 Stray Light
  • 4.7 Humidity
  • 5.0 Electrical Test Conditions
  • 5.1 Power Supply Requirements
    5.1.1 Voltage Waveform and Frequence
    5.1.2 AC Voltage Regulation
    5.1.3 DC Voltage Regulation
  • 5.2 Test and Reference Circuit Requirements
    5.2.1 Test Circuit Requirements
    5.2.2 Reference Circuit Test
  • 5.3 Electrical Measurement Instrument Calibration
    5.3.1 Voltage Circuit Internal Impedance
    5.3.2 AC Power Meter Accuracy
    5.3.3 AC Power Analyzer Frequency Range
    5.3.5 DC Voltage Measurement
    5.3.6 DC Current Measurement
  • 5.4 Electrical Settings
  • 6.0 Test Preparation
  • 6.1 DUT Identification
  • 6.2 DUT Handling
  • 6.3 Seasoning
  • 6.4 Pre-burn and Stabilization
  • 6.5 Operating Position and Orientation
  • 6.6 Optical and Electrical Waveforms
  • 7.0 Total Luminous Flux and Integrated Optical Measurements
  • 7.1 General
  • 7.2 Integrating Sphere Systems
    7.2.1 General
    7.2.2 Photometer and Spectroradiometer Characteristics
    7.2.3 Self-Absorption and Size of Sphere
  • 7.3 Angular Integration Systems
    7.3.1 General
    7.3.2 Photometer and Spectroradiometer Characteristics
    7.3.3 Angular Scanning Resolution
    7.3.4 Angular Range
  • 8.0 Luminous Intensity or Optical Angular Distribution Measurement
  • 8.1 General
  • 8.2 Photometer and Spectroradiometer Characteristics
  • 8.3 Test Distance
  • 8.4 Goniometer Alignment
  • 9.0 Chromaticity Uniformity Measurements
  • 9.1 General
  • 9.2 Angular Resolution
  • 9.3 Angular Range
  • 9.4 Angular Color Uniformity
  • 9.5 Signal Limit and Verification
  • 10.0 Measurement Uncertainty
  • 11.0 Reporting Requirements
  • 11.1 Typical Report Content
  • 11.2 Nonstandard Conditions or Operating Procedures
  • Annex A – Airflow Considerations for Testing SSL Products
  • Annex B – High Frequency Current and Measurement Circuit Capacitance
  • Annex C – Power Supply Resistance and Inductance Dependency
  • Annex D – Tolerance Interval vs. Acceptance Interval
  • Annex E – Benefits of Waveform Measurement
  • Annex F – Lower Luminous Intensity for Chromaticity Uniformity
  • References