Industries-Environment Measurement Standards

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LM-85-14 View IES Approved Method for Electrical & Photometric Measurements of High Power LEDs
LM-9-09 View Electrical and Photometric Measurements of Fluorescent Lamps
LM-52-03 View Photometric Measurements of Roadway Sign Installations (Reaffirmed 2014)
LM-62-06 View Laboratory or Field Thermal Measurements of Fluorescent Lamps and Ballasts in Luminaires, Reaffirmed
LM-76-02 View Photometric Testing of Fiber Optics Lighting Systems (Reaffirmed 2008)
LM-78-07 View Approved Method for Total Luminous Flux Measurement of Lamps Using an Integrating Sphere Photometer
LM-79-08 View Approved Method: Electrical and Photometric Measurements of Solid-State Lighting Products
LM-77-09 View Intensity Distribution Measurement of Luminaires and Lamps Using Digital Screen Imaging Photometry
LM-81-10 View Photometric Testing of Skylights and Tubular Daylighting Devices under Hemispherical Sky Conditions
LM-40-10 View Life Testing of Fluorescent Lamps

Standard:LM-85-14

Published:01-Jan-2014

Description:IES Approved Method for Electrical & Photometric Measurements of High Power LEDs

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.

Contents

Scope

Normative References

Definitions

Preparation for Measurements

Methods of Measurement under Pulse-Mode Operation of DUT

Method of Measurement under DC-Mode Operation of DUT

Optical Measurement and Equipment

Electrical Measurement and Equipment

Test Report

References

Annex A Pulse-Mode and DC-Mode Methods for LED Operation

Annex B Estimation of Tj Rise and Correction

Annex C Caution for Optical Measurement Instruments for Pulse-Mode Methods

Annex D Integrating Sphere and Goniophotometer

Annex E Integrating Sphere Geometries and Calibration Methods

Annex F General Design of Integrating Spheres

Annex G Self-Absorption Correction

Annex H Calibration of Sphere-Spectroradiometer

Annex I Use of Spectroradiometer

Annex J Other Sources of Error

Annex K Sphere-Photometer System

Annex L Goniophotometric Method for Total Luminous Flux

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Company		Cost
IES.ORG	Email	USD$ 25.00	Document

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