Approved Method: Application Distance Radiometry

Application Distance Radiometry

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ANSI/IES LM-91-22
Document Type: Lighting Measurement and Testing (LM)

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SKU: ANSI/IES LM-91-22 Category: Tag:

Product Description

Approved American National StandardIn near-field conditions the use of far-field IES-format photometric files results in substantially incorrect irradiance, illuminance, or photon-flux density values being predicted by lighting layout models constructed for near-field conditions. This problem can be overcome by using distance-specific IES file(s), generated by first collecting data at the working distance(s) of interest obtained from a single luminaire and then converting them to distance-specific IES file(s), following the protocol described in this document.

Page count: 40 pages
Publisher: Illuminating Engineering Society (2022)
SKU: ANSI/IES LM-91-22
ISBN-13: 978-0-87995-417-8

Chapters:

  • 1.0 Introduction and Scope
    2.0 Normative References
    3.0 Definitions
    4.0 Physical and Environmental Test Conditions
    5.0 Electrical Test Conditions
    6.0 Test Preparation
    7.0 Test Procedures
    8.0 Data Processing
    9.0 Procedures for Application-Distance IES File Generation
    10.0 Reporting Requirements

Citation Format:
Illuminating Engineering Society. ANSI/IES LM-91-22, Approved Method: Application Distance Radiometry. New York: IES; 2022.

CONTENTS

  • 1.0 Introduction and Scope
  • 1.1 Introduction
  • 1.2 Scope
  • 2.0 Normative References
  • 2.1 ANSI/ASABE S642 SEP2018
  • 2.2 ANSI/IES LM-20-20
  • 2.3 ANSI/IES LM-41-20 (conditionally normative)
  • 2.4 ANSI/IES LM-46-20 (conditionally normative)
  • 2.5 ANSI/IES LM-63-19
  • 2.6 ANSI/IES LM-75-19
  • 2.7 ANSI/IES LM-79-19 (conditionally normative)
  • 2.8 ANSI/IES LS-1-21
  • 2.9 ANSI/IES TM-33-18
  • 3.0 Definitions
  • 3.1 beam angle
  • 3.2 device under test (DUT)
  • 3.3 partial flux
  • 4.0 Physical and Environmental Test Conditions
  • 4.1 General
  • 4.2 Temperature
  • 4.3 Airflow
  • 4.4 Humidity
  • 4.5 Vibration
  • 4.6 Optical Conditions
    4.6.1 Stray Light
    4.6.2 Cosine Correction Requirements for Near-Field Measurements
    4.6.3 Cosine Correction Requirements for Far-Field Measurements
    4.6.4 Wavelength Ranges
  • 4.7 Spatial Conditions
    4.7.1 Near-Field Scans
    4.7.2 Far-Field Goniometry
  • 5.0 Electrical Test Conditions
  • 5.1 Power Supply Requirements
  • 5.2 Reference Circuit Requirements
  • 5.3 Electrical Measurement Instrument Requirements
  • 6.0 Test Preparation
  • 7.0 Test Procedures
  • 7.1 Alignment and Coordinate System Establishment
  • 7.2 Cosine Corrector Characterization for Near-Field Measurements
  • 7.3 Radial Scan Method
    7.3.1 Near Field – Direct Measurement at Application Distance
    7.3.2 Far Field

  • 7.4 Rectangular Scan Method
    7.4.1 System and Sensor Setup
  • 8.0 Data Processing
  • 8.1 Four-Corners Method
  • 8.2 Weighted-Average Method
  • 9.0 Procedures for Application-Distance IES File Generation
  • 9.1 Initial Data Transformation
  • 9.2 Near-Field Data Correction
  • 9.3 Merging Data at Transition to a Vertical Angle of 90o and Beyond
  • 9.4 Application Distance IES File Generation
  • 10.0 Reporting Requirements
  • 10.1 Administrative Information
  • 10.2 DUT Description
  • 10.3 Test Conditions
  • 10.4 Test Equipment
  • 10.5 Measured Results
  • 10.6 Optional Items
  • Annex A – Exact Near-Field Models and Related Insights
  • Annex B – Sample Computer LM-63 and TM-33 Files