Approved Method: Optical and Electrical Measurements of Solid-State Lighting Products

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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Product Description

Approved American National StandardThis approved method describes the 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. This approved method covers LED luminaires, OLED luminaires, integrated LED lamps, integrated OLED lamps, non-integrated LED lamps operated with a driver designated by a manufacturer’s identification number or by a defined reference circuit, and LED light engines. SSL products, excluding non-integrated LED lamps, are intended to directly connect to AC mains power or to a DC voltage power supply to operate.

The photometric information typically required for SSL products includes total luminous flux (lumens), luminous efficacy (lm/W), luminous intensity (candelas) in one or more directions, chromaticity coordinates, correlated color temperature (CCT), and color rendering index (CRI). In addition, special lighting applications of SSL products may need data such as radiant intensity, photon intensity, radiant flux, photon flux, radiant efficacy, and photon efficacy. The electrical characteristics measured for AC-powered SSL products include RMS AC voltage, RMS AC current, AC active power, power factor, total harmonic current distortion, and voltage frequency. For DC-powered SSL products, measured electrical characteristics include DC voltage, DC current, and power.

This document does not cover SSL products that require external heat sinks, nor does it cover components of SSL products, such as LED packages or LED arrays. This document does not cover housings or luminaires designed for SSL products and sold without a light source (for which relative photometry would typically be used). This document describes test methods for individual SSL products, and does not cover the determination of the performance rating of products, in which individual variations among the products should be considered.

Page count: 22 pages
Publisher: Illuminating Engineering Society (2019)
SKU: ANSI/IES LM-79-19
ISBN-13: 978-0-87995-004-0

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-79-19, Approved Method: Optical and Electrical Measurements of Solid State Lighting Products. New York: IES; 2019.

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