Photometric Testing of Floodlights Using High Intensity Discharge or Incandescent Lamps
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ANSI/IES LM-35-20
Document Type: Lighting Measurement and Testing (LM)
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Product Description
This document provides a method for uniformity in measuring and reporting of the optical performance of floodlights and similar luminaires having a total field angle greater than or equal to 10 degrees in any cross section. The method applies to luminaires that utilize a variety of light sources, including tungsten filament, tungsten-halogen, and high intensity discharge (HID) lamps.
Page count: 24 pages
Publisher: Illuminating Engineering Society (2020)
SKU: ANSI/IES LM-35-20
ISBN-13: 978-0-87995-350-8
Chapters:
-
1.0 Introduction and Scope
2.0 Normative References
3.0 Definitions and Nomenclature
4.0 Physical and Environmental Test Conditions
5.0 Electrical Test Conditions
6.0 Testing Procedure Requirements
7.0 Test Report
8.0 Additional Reading
Citation Format:
Illuminating Engineering Society. ANSI/IES LM-35-20, Approved Method: Photometric Testing of Floodlights Using High Intensity Discharge or Incandescent Lamps. New York: IES; 2020.
CONTENTS
- 1.0 Introduction and Scope
- 1.1 Introduction
- 1.2 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 units
- 3.2 auxiliary equipment
- 4.0 Physical and Environmental Test Conditions
- 4.1 General
- 4.2 Temperature
- 4.3 Airflow
- 4.4 Stray Light
- 4.5 Vibratio
- 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 Goniophotometer
6.1.1.1 General
6.1.1.2 Coordinate Systems
6.1.1.3 Photometric System
6.1.1.4 Repeatability of Light Readings - 6.2 Test Distance
- 6.3 Selection and Preparation of the Equipment for Test
6.3.1 Selection
6.3.2 Mounting
6.3.3 Lamp Orientation
6.3.3.1 Discharge Lamps
6.3.3.2 Incandescent Filament Lamps
6.3.4 Focusing
6.3.5 Cleaning - 6.4 Test Lamps
6.4.1 General
6.4.2 Lamp Seasoning
6.4.3 Test Lamp Operation
6.4.3.1 General
6.4.3.2 Incandescent Filament Lamps
6.4.3.3 HID lamps - 6.5 Test Methodologies
6.5.1 General
6.5.2 Bare Lamp Measurement
6.5.3 Lamp Photometric Calibration Process
6.5.3.1 Relative Photometry Method
6.5.3.1.1 Vertically Mounted Lamps
6.5.3.1.2 Horizontally Mounted Lamps
6.5.3.2 Absolute Photometry Method
6.5.3.2.1 Method Using Luminous Intensity Standard
6.5.3.2.2 Method Using Luminous Flux Standard
6.5.3.2.3 Method Using Calibrated Photometer
6.5.4 Luminaire Photometry
6.5.4.1 Mounting
6.5.4.2 Angles for Photometric Measurements
6.5.4.2.1 General
6.5.4.2.2 Standard Set of Lateral Data Angles
6.5.4.2.3 Standard Set of Vertical Data Angles
6.5.4.3 Photometric Data Processing
6.5.4.3.1 Stray Light Cancellation
6.5.4.3.2 Symmetry and Averaging of Data
6.5.4.3.3 Zonal Lumens and Total Lumens
6.5.4.3.4 Field Angle
6.5.4.3.5 Field Lumens
6.5.4.3.6 Beam Angle
6.5.4.3.7 Beam Lumens
6.5.4.3.8 Measuring and Recording Spill Light
6.5.4.3.9 Classification of Floodlight Beam Types
6.5.4.3.10 Isocandela Plot - 7.0 Test Report
- 7.1 General
- 7.2 Test Report Contents
- 8.0 Additional Reading
- Annex A – Zonal Constants
- Annex B – Photometric Report and Test Results
- Annex C – Data File Formatted for Electronic Media
- Informative References