IES LM 85 2014

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IES LM-85 Approved Method: Electrical and Photometric Measurements of High-Power LEDs

Published By	Publication Date	Number of Pages
IES	2014	31

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Category: IES

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Description

This document describes the procedures to be followed and precautions to be observed in performing accurate measurements of total luminous flux, total radiant flux (optical power), total photon flux, electrical power, luminous efficacy, color quantities, and wavelength characteristics of high-power light emitting diodes (LEDs) including white LEDs as well as single color LEDs. This document covers LED packages (defined in ANSI/IES RP-16-10) including those with multiple chips and remote-phosphor LED packages. This document covers measurement under pulse operation as well as steady DC operation of LEDs, and in all cases, the thermal condition of LEDs refers to their junction temperature. The approved methods apply to laboratory measurements. This document does not cover LED arrays or modules, nor LED lighting products; it does not cover AC driven LEDs, and does not apply to measurements in LED manufacturer’s production control nor relative measurements of LED thermal characteristics.

PDF Catalog

PDF Pages	PDF Title
1	Cover
3	Copyright
4	Subcommittee on Solid-State Lighting ofthe IES Testing Procedures Committee
6	Contents
8	INTRODUCTION 1.0 SCOPE
9	2.0 NORMATIVE REFERENCES 3.0 DEFINITIONS 3.1 Device Under Test (DUT) 3.2 Duv 3.3 Goniophotometer 3.4 Gonio-Colorimeter 3.5 Gonio-Spectroradiometer 3.6 Heat Sink 3.7 High-Power LED 3.8 National Metrology Institute (NMI) 3.9 Photometer Head 3.10 Remote Phosphor LED Package 3.11 Settling Time 3.12 Sphere-Photometer 3.13 Sphere-Spectroradiometer 3.14 Temperature-Controlled Platform (TCP)
10	3.15 Thermal Chamber 4.0 PREPARATION FOR MEASUREMENTS 4.1 Seasoning 4.2 Operating Orientation 4.3 Thermal Conditions 5.0 METHODS OF MEASUREMENT UNDERPULSE-MODE OPERATION OF DUT 5.1 General 5.2 Single Pulse Mode
12	5.3 Continuous Pulse Mode
13	6.0 METHOD OF MEASUREMENT UNDERDC-MODE OPERATION OF DUT 6.1 General 6.2 Ambient Temperature Condition 6.3 Measurement Procedures
14	7.0 OPTICAL MEASUREMENT ANDEQUIPMENT 7.1 Total Luminous Flux
16	7.2 Luminous Efficacy 7.3 Total Radiant Flux 7.4 Total Photon Flux 7.5 Luminous Intensity Distribution 7.6 Color Quantities
17	7.7 Wavelength Characteristics 7.8 Uncertainties
18	8.0 ELECTRICAL MEASUREMENTAND EQUIPMENT 8.1 Pulse Current Source and Pulse Current/Voltage Meter 8.2 Uncertainties 9.0 TEST REPORT
19	REFERENCES
20	ANNEX A PULSE-MODE AND DC-MODEMETHODS FOR LED OPERATION ANNEX B ESTIMATION OF Tj RISE ANDCORRECTION B1 Analysis example for single pulse mode
21	B2 Analysis example for continuous pulsemode REFERENCES FOR ANNEX B
22	ANNEX C CAUTION FOR OPTICALMEASUREMENT INSTRUMENTSFOR PULSE-MODE METHODS C1 Single Pulse Mode C2 Continuous Pulse Mode ANNEX D INTEGRATING SPHEREAND GONIOPHOTOMETER
23	REFERENCES FOR ANNEX D ANNEX E INTEGRATING SPHEREGEOMETRIES AND CALIBRATION METHODS
25	ANNEX F GENERAL DESIGNOF INTEGRATING SPHERES
26	ANNEX G SELF-ABSORPTION CORRECTION ANNEX H CALIBRATION OF SPHERESPECTRORADIOMETER
27	ANNEX I. USE OF SPECTRORADIOMETER REFERENCES FOR ANNEX I
28	ANNEX J OTHER SOURCES OF ERROR ANNEX K SPHERE-PHOTOMETER SYSTEM
29	REFERENCES FOR ANNEX K
30	ANNEX L GONIOPHOTOMETRIC METHODFOR TOTAL LUMINOUS FLUX