Electrical and Photometric Measurements of High-Power LEDs

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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.

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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.

Softcover or Digital PDF: 23 pages
Publisher: Illuminating Engineering Society (2014)
SKU: LM-85-14
ISBN-13: 978-0-87995-289-1
Dimensions: 8½” x 11″

Additional information

Weight 1 lbs
Dimensions 11 x 8.5 x .25 in
Format

Digital, Softcover

Table of 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