Projecting Long-Term Chromaticity Coordinate Shift of LED Packages, Arrays, and Modules
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ANSI/IES TM-35-19+E1
Document Type: Technical Memorandum (TM)
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Product Description
It is important to note that in some applications—such as retail and museum lighting—a characterization of anticipated chromaticity shift of SSL products over their usable lifetime is very important to the user. Further, the chromaticity coordinates of some light sources can change significantly from their initial values over time. This document provides recommendations for projecting long-term chromaticity coordinate stability of LED light sources using data obtained per ANSI/IES LM-80-15, Approved Method: Measuring Luminous Flux and Color Maintenance of LED Packages, Arrays, and Modules.
Page count: 46 pages
Publisher: Illuminating Engineering Society (2019)
SKU: ANSI/IES TM-35-19+E1
ISBN-13: 978-G-87995-082-8
Chapters:
- 1.0 Scope
2.0 Normative References
3.0 Definitions
4.0 Test Data and Sample Size
5.0 Chromaticity Coordinate Shift Projection
6.0 Temperature and Current Interpolation
7.0 Report
Citation Format:
Illuminating Engineering Society. ANSI/IES TM-35-19+E1, Technical Memorandum: Projecting Long-Term Chromaticity Coordinate Shift of LED Packages, Arrays, and Modules. New York: IES; 2019.
CONTENTS
- 1.0 Introduction and Scope
- 2.0 Normative References
- 3.0 Definitions
- 3.1 chromaticity shift, Δu’v’
- 3.2 chromaticity shift life, CSn
- 3.3 differential chromaticity, δu’*, δv’*
- 3.4 DUT
- 3.5 LED light source
- 3.6 relative chromaticity δu’, δv’
- 4.0 Test Data and Sample Size
- 4.1 Data to Be Used
- 4.2 Measurement Interval and Sample Size Recommendations
- 4.3 Chromaticity Data Collection
- 5.0 Chromaticity Coordinate Shift Projection
- 5.1 Method
- 5.2 Procedures
- 5.2.1 Relative Chromaticities
- 5.2.2 Average Relative Chromaticities
- 5.2.3 Differential Chromaticities
- 5.2.4 Data Used for Curve-Fit
- 5.2.5 Curve-Fit
- 5.2.6 Projecting Future Behaviors
- 5.2.7 Adjustment of Results
- 5.2.8 Notation for Projected Chromaticity Shift Life
- 6.0 Temperature and Current Interpolation
- 7.0 Report
- Annex A – Comments on Color Maintenance Behavior
- Annex B – Types of Chromaticity Shift Behavior
- Annex C – Mathematical Model Development
- Annex D – Calculation Examples
- Annex E – Extrapolation Methods
- Additional Reading