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Details
LM-85-14
IES Approved Method for Electrical & Photometric Measurements of High Power LEDs
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LM-9-09
Electrical and Photometric Measurements of Fluorescent Lamps
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LM-46-04
Photometric Testing of Indoor Luminaires Using High Intensity Discharge or Incandescent Filament Lam
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LM-62-06
Laboratory or Field Thermal Measurements of Fluorescent Lamps and Ballasts in Luminaires, Reaffirmed
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LM-76-02
Photometric Testing of Fiber Optics Lighting Systems (Reaffirmed 2008)
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LM-78-07
Approved Method for Total Luminous Flux Measurement of Lamps Using an Integrating Sphere Photometer
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LM-77-09
Intensity Distribution Measurement of Luminaires and Lamps Using Digital Screen Imaging Photometry
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LM-84-14
IES Approved Method for Measuring Luminous Flux and Color Maintenance of LED Lamps, Light Engines, a
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LM-80-15
IES Approved Method: Measuring Luminous Flux and Color Maintenance of LED Packages, Arrays and Modul
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LM-86-15
IES Approved Method: Measuring Luminous Flux and Color Maintenance of Remote Phosphor Components (LM
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LM-77-09
01-Jan-2009
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
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