Photometry of Reflector Type Lamps
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ANSI/IES LM-20-20
Document Type: Lighting Measurement and Testing (LM)
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Product Description
This document describes photometric testing procedures and reporting guidelines for reflector type lamps and LED based lamps that mimic this traditional style of lamp. The application of the described procedures and guidelines will improve reproducibility within a laboratory, and will improve measurement agreement and facilitate comparison of results between laboratories. As used in this laboratory method, a reflector type lamp is a lamp having a reflective element(s) intended to redirect flux from the emitting element (e.g., filament, arc, LED) to form the intended spatial distribution of the light. For example, a reflective element might take the form of a reflective coating applied to the lamp bulb, or a reflector positioned relative to the emitting element and permanently affixed in this position. In addition, integrated LED lamps using reflective and refractive elements to create the intended spatial distribution are within the scope of this document.
Page count: 13 pages
Publisher: Illuminating Engineering Society (2020)
SKU: ANSI/IES LM-20-20
ISBN-13: 978-0-87995-194-8
Chapters:
- 1.0 Introduction and Scope
2.0 Normative References
3.0 Definitions
4.0 Ambient and Physical Conditions
5.0 Electrical and Photometric Test Conditions
6.0 Lamp Test Procedures
7.0 Photometric Characterization by Measurement of Intensity Distribution
8.0 Total Flux Measurement by Integrating Sphere Method
9.0 Test Report
Citation Format:
Illuminating Engineering Society. ANSI/IES LM-20-20, Approved Method: Photometry of Reflector Type 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 LM-35-20
- 2.2 ANSI/IES LM-45-20
- 2.3 ANSI/IES LM-51-20
- 2.4 ANSI/IES LM-54-20
- 2.5 ANSI/IES LM-63-19
- 2.6 ANSI/IES LM-66-20
- 2.7 ANSI/IES LM-75-19
- 2.8 ANSI/IES LM-78-20
- 2.9 ANSI/IES LM-79-19
- 2.10 ANSI/IES LS-1-20
- 3.0 Definitions
- 3.1 beam axis
- 3.2 central cone
- 3.3 extraneous light
- 3.4 photometric axis
- 3.5 photometric center of lamp
3.5.1 for non-symmetric beam patterns
3.5.2 for symmetric beam patterns - 3.6 stray light
- 3.7 undirected light
- 4.0 Ambient and Physical Conditions
- 4.1 Genera
- 4.2 Temperature
- 4.3 Airflow
- 4.4 Vibration
- 5.0 Electrical and Photometric Test Conditions
- 5.1 Wave Shape
- 5.2 Voltage or Current Regulation
- 5.3 Circuits and Lamp Connections
- 5.4 Photometer System
- 6.0 Lamp Test Procedures
- 6.1 Lamp Seasoning
- 6.2 Lamp Stabilization
- 7.0 Photometric Characterization by Measurement of Intensity Distribution
- 7.1 Goniophotometer
- 7.2 Goniophotometer, Optical Alignment
- 7.3 Test Distance
- 7.4 Angular Resolution
- 7.5 Undirected Light
- 7.6 Number of Distribution Curves
- 7.7 Polar Goniophotometer Based Measurement
- 7.8 Beam with Rotational Symmetry
7.8.1 Polar Scan Method
7.8.2 Rotation of Lamp Method - 7.9 Beam without Rotational Symmetry
- 7.10 Determination of Derived Quantities from the Intensity Distribution
7.10.1 Luminous Flux
7.10.2 Beam Angle
7.10.3 Field Angle
7.10.4 Beam Flux Values
7.10.5 Beam Pattern Classification - 7.11 Special Applications
- 8.0 Total Flux Measurement by Integrating Sphere Method
- 8.1 Calibration of Integrating Sphere
- 8.2 Exclusion of Undirected Light by Using a Luminaire Inside an Integrating Sphere
- 8.3 Measuring Compact Fluorescent Reflector with an Integrating Sphere
- 9.0 Test Report
- 9.1 Lamp and Test Description
9.1.1 Lamp, General
9.1.2 Sphere-Specific
9.1.3 Gonio-Specific - 9.2 General Test Conditions
- 9.3 Lamps Designed for General Lighting
- 9.4 Lamps Designed for Spotlighting and Floodlighting
- Informative References