Approved Method: Measuring Luminous Flux and Color Maintenance of Remote Phosphor Components

Measuring Luminous Flux and Color Maintenance of Remote Phosphor Components

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ANSI/IES LM-86-20
Document Type: Lighting Measurement and Testing (LM)

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SKU: ANSI/IES LM-86-20 Category: Tag:

Product Description

Approved American National StandardDue to the gradual nature of decay mechanisms, a remote phosphor component may undergo shifts in spectral emission, color rendering ability, and luminous efficacy that degrade performance over time. Thus, an LED based lamp or luminaire with a remote phosphor component could experience shifts in performance outside the product’s specification over the product’s lifetime. With prolonged exposure to high irradiance levels from pump LED sources, the remote phosphor component may exhibit changes in its chromaticity, correlated color temperature (CCT), and color rendering index (CRI). This document provides the method for measurement of luminous flux and color maintenance of remote phosphor components. It describes the procedures to be followed and the precautions to be observed in order to obtain uniform and reproducible luminous flux and color maintenance measurements under standard operating conditions.

Page count: 10 pages
Publisher: Illuminating Engineering Society (2020)
SKU: ANSI/IES LM-86-20
ISBN-13: 978-0-87995-220-4

Chapters:

  • 1.0 Introduction and Scope
    2.0 Normative References
    3.0 Definitions
    4.0 Pump LED Sources and Electrical Requirements
    5.0 Physical and Environmental Conditions for Maintenance Test
    6.0 Photometric Measurements
    7.0 Maintenance Test Procedures
    8.0 Test Report

Citation Format:
Illuminating Engineering Society. ANSI/IES LM-86-20, Approved Method: Measuring Luminous Flux and Color Maintenance of Remote Phosphor Components. New York: IES; 2020.

CONTENTS

  • 1.0 Introduction and Scope
  • 1.1 Introduction
  • 1.2 Scope
  • 2.0 Normative References
  • 2.1 ANSI/IES LS-1-20
  • 2.2 ANSI/IES LM-80-20
  • 3.0 Definitions
  • 3.1 air temperature (TA)
  • 3.2 average irradiance on DUT (Eave,DUT)
  • 3.3 average surface temperature (Ts,avg)
  • 3.4 conversion efficacy (Kconv)
  • 3.5 conversion efficacy maintenance
  • 3.6 device under test (DUT)
  • 3.7 emission surface and clear aperture
  • 3.8 excitation surface
  • 3.9 failure of DUT
  • 3.10 maintenance pump LED source
  • 3.11 maintenance test
  • 3.12 maximum surface temperature (TS,MAX)
  • 3.13 measurement interval
  • 3.14 reference pump LED source
  • 3.15 remote phosphor
  • 3.16 remote phosphor component
  • 4.0 Pump LED Sources and Electrical Requirements
  • 4.1 Pump LED Sources
    4.1.1 Pump LED Source Characteristics
    4.1.2 Measurement of Maintenance and Reference Pump LED Source Characteristics
  • 4.2 Power Supply Electric Requirements
  • 5.0 Physical and Environmental Conditions for Maintenance Test
  • 5.1 Temperature
    5.1.1 Temperature on DUT Surfaces
    5.1.2 Air Temperature
  • 5.2 Air Flow
  • 5.3 Humidity
  • 6.0 Photometric Measurements
  • 6.1 Pump LED Source Measurement
  • 6.2 Pump LED Source Radiant Flux Maintenance
  • 6.3 Measurements of Photometric and Color Characteristics
  • 6.4 Conversion Efficacy Calculation
  • 7.0 Maintenance Test Procedures
  • 7.1 Seasoning or Aging
  • 7.2 DUT Exposure to Pump LED Sources (Irradiance)
  • 7.3 DUT Maximum Surface Temperature
  • 7.4 DUT Average Surface Temperature
  • 7.5 Test Duration, Measurement Interval, and Time Keeping
  • 8.0 Test Report
  • Annex A – Conversion Efficacy of Remote Phosphor Components
  • Annex B – Recommendations for Surface Temperature Measurements and Thermocouple Usage
  • Annex C – Thermal Test Recommendations
  • Annex D – Photometric Measurement Recommendations
  • Additional Reading
  • Informative References