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Approved Method: Photometric Testing of Searchlights Using Incandescent or HID Sources

Photometric Measurement of Searchlights Using Incandescent or HID Sources

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ANSI/IES LM-11-20
Document Type: Lighting Measurement and Testing (LM)

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SKU: ANSI/IES LM-11-20 Category: Tag:

Product Description

Approved American National StandardThis Approved Method applies to lighting equipment having a total field angle of less than ten degrees. This includes equipment in which light is controlled by reflectors, lenses, or their combinations. The document applies to projectors with a variety of light sources, including tungsten filament, tungsten-halogen, and high intensity discharge lamps. It does not apply to projector systems composed of arrays of light emitting diodes.

Page count: 19 pages
Publisher: Illuminating Engineering Society (2020)
SKU: ANSI/IES LM-11-20
ISBN-13: 978-0-87995-012-5

Chapters:

  • 1.0 Introduction and Scope
    2.0 Normative References
    3.0 Nomenclature and Definitions
    4.0 Physical and Environmental Test Conditions
    5.0 Electrical Test Conditions
    6.0 Testing Procedure Requirements
    7.0 Reporting of Data

 
Citation Format:
Illuminating Engineering Society. ANSI/IES LM-11-20, Approved Method: Photometric Measurement of Searchlights Using Incandescent or HID Sources. New York: IES; 2020.

CONTENTS

  • 1.0 Objective and Scope
  • 2.0 Normative References
  • 2.1 ANSI/IES LS-1-20
  • 2.2 ANSI/IES LM-45-20
  • 2.3 ANSI/IES LM-51-20
  • 2.4 ANSI/IES LM-54-20
  • 3.0 Nomenclature and Definitions
  • 3.1 auxiliary equipment
  • 3.2 units
  • 4.0 Physical and Environmental Test Conditions
  • 4.1 General
  • 4.2 Temperature
  • 4.3 Airflow
  • 4.4 Stray Light
  • 4.5 Vibration
  • 5.0 Electrical Test Conditions
  • 5.1 Power Supply Requirements
    5.1.1 Primary Source Voltage
    5.1.2 Power Supply Wave Shape
    5.1.3 Power Supply Regulation
  • 5.2 Reference Circuit Requirements
  • 5.3 Measurement Instrument Requirements
    5.3.1 Electrical Instruments
  • 6.0 Testing Procedure Requirements
  • 6.1 General Procedure
    6.1.1 Goniophotometers
  • 6.2 Range Requirements
    6.2.1 Range Length
    6.2.2 Alternative Short Test Distance Method
  • 6.3 Range Location
  • 6.4 Correction for atmospheric Transmission
  • 6.5 Selection and Preparation of the Equipment for Test
    6.5.1 Selection
    6.5.2 Mounting
    6.5.3 Focusing
    6.5.4 Cleaning
  • 6.6 Test Lamps
    6.6.1 General
    6.6.2 Lamp Seasoning
    6.6.3 Test Lamp Operation
  • 6.7 Test Data
    6.7.1 Horizontal and Vertical Traces of Luminous Intensity
    6.7.2 Iso-candela Diagram of the Beam Profile
    6.7.3 Luminous Flux of the Projected Beam
    6.7.4 Efficiency of the Light Source
  • 6.8 Computation of Results
    6.8.1 Computation
    6.8.2 Process
  • 7.0 Reporting of Data
  • Annex A — Inverse-Squared Distance Calculations
  • Annex B — Atmospheric Transmittance Determination
  • Annex C — Focusing Methods
  • References