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IES LM 80 2015

IES LM 80 2015

$27.08

IES LM-80: IES Approved Method: Measuring Luminous Flux and Color Maintenance of LED Packages, Arrays and Modules

Published By Publication Date Number of Pages
IES 2015 18
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This document describes the procedures by which LEDs are tested for the luminous (or radiant, or photon) flux maintenance and chromaticity maintenance or wavelength changes over time when operated under controlled environmental and operational conditions. The resulting measurements may be used for comparison of LEDs, and they may be utilized in models that project long-term changes in light output during the life of the LEDs. The scope within this ANSI/IES LM-80-15 has been expanded to include tests for three types of flux maintenance along with tests for how chromaticity changes over time. LED drive characteristics have been updated to include pulse width modulated current, DC constant voltage and AC regulated voltage drive. The maintenance test duration and measurement interval are no longer specified but rather left for determination according to the intended usage of the data. The reporting section is more specific with regard to the required data. Requirements for thermal measurements have been clarified to reflect industry best practices.

PDF Catalog

PDF Pages PDF Title
1 Cover
3 Copyright
4 Prepared by the Solid-State Lighting Subcommittee of theIES Testing Procedures Committee
8 Contents
10 Introduction
1.0 Scope
2.0 Normative References
2.1 The IES Nomenclature Committee
2.2 ASTM Standard E230/E23M-112
3.0 Definitions
3.1 Air Temperature
3.2 Case Temperature
3.3 Centroid Wavelength
11 3.4 Device Under Test
3.5 Dominant Wavelength
3.6 Drive Level
3.7 DUT Failure
3.8 Luminous Flux Maintenance
3.9 Maintenance Test
3.10 Measurement Interval
3.11 Peak Wavelength
3.12 Photon Flux
3.13 Photon Flux Maintenance
3.14 Radiant Flux
3.15 Radiant Flux Maintenance
4.0 Physical and Environmental Conditions
4.1 General
12 4.2 Humidity
4.3 Air Temperature
4.4 Air Movement
4.5 Temperature Measurement Equipment orSystem
5.0 Electrical Conditions
5.1 DUT Drivers
5.2 Drive Level Value
5.3 DC Constant Current Drive
5.4 Pulse Width Modulated (PWM) CurrentDrive
5.5 DC Constant Voltage Drive
13 5.6 AC Regulated Voltage Drive
6.0 Photometric and Electrical Measurement Procedures
6.1 DUT Photometric and ElectricalMeasurements
6.2 DUT Measurement Temperature Condition
6.3 DUT Measurement Drive Level
7.0 Maintenance Test Procedures
7.1 Seasoning or Aging
14 7.2 DUT Tracking
7.3 Timekeeping
7.4 DUT Case Temperatures
7.5 Maintenance Test Duration and Measurement Interval
7.6 Recording DUT Failures
8.0 Test Report
16 Annex A DUT Sample Selection (Informative)
Annex B Monitoring of Case Temperatures (Normative)

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IES LM 80 2015
$27.08