Industries-Transportation Measurement Standards

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LM-85-14 View IES Approved Method for Electrical & Photometric Measurements of High Power LEDs
LM-52-03 View Photometric Measurements of Roadway Sign Installations (Reaffirmed 2014)
LM-76-02 View Photometric Testing of Fiber Optics Lighting Systems (Reaffirmed 2008)
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LM-79-08 View Approved Method: Electrical and Photometric Measurements of Solid-State Lighting Products
LM-77-09 View Intensity Distribution Measurement of Luminaires and Lamps Using Digital Screen Imaging Photometry
LM-50-13 View IES Approved Method for Photometric Measurement of Roadway and Street Lighting Installations
LM-84-14 View IES Approved Method for Measuring Luminous Flux and Color Maintenance of LED Lamps, Light Engines, a
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LM-80-15 View IES Approved Method: Measuring Luminous Flux and Color Maintenance of LED Packages, Arrays and Modul
ISO 7637 View
ISO 10605 View
ISO 11452 View
ISO 16750-2 View
IEC 61851-21 View
IEC 61851-22 View
Ford FMC1278 View
TO-3 View BTEX and TPH

Standard:LM-77-09

Published:01-Jan-2009

Description:Intensity Distribution Measurement of Luminaires and Lamps Using Digital Screen Imaging Photometry

The intent of LM-77-09 is to describe measurement procedures for the determination of the luminous intensity distribution of certain lamps and luminaries using a digital camera to capture the projected light distribution from a luminaire on a screen. This measurement technique is relatively new, therefore considerable detail is provided to assist the reader in understanding the principles, requirements and limitations involved. Digital photometry offers very high speed data collection over a traditional goniophotometer, although typically over a restricted angular range. Many factors must be taken into account to achieve accurate digital photometry and this report addresses the most significant of these factors.

Contents

1 Foreword

2 Background and Basic Principles

3 Test System Geometry

4 Angular Resolution

5 Stray Light

6 Specification of the Digital Camera

7 Linearity Verification and Useable Range

8 Calibration

9 Test Procedure

10 Data Reduction and Test Report

References

Glossary

ANNEX A Geometrical Relationships

ANNEX B—Lens Distortion Correction

ANNEX C—Noise Estimation

ANNEX D—Linearity Calculation Details

Availability
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