IES TM 21 2011

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IES TM-21 Projecting Long Term Lumen Maintenance of LED Light Sources

Published By	Publication Date	Number of Pages
IES	2011	33

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Category: IES

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Description

This document recommends a method for projecting the lumen maintenance of LED light sources from the data obtained by the procedures found in IES document LM-80-08 Approved Method for Measuring Lumen Maintenance of LED Light Sources. LED light sources provide a very long usable life but light output gradually depreciates over time. TM-21-11 provides the method for determining when the

PDF Catalog

PDF Pages	PDF Title
1	Cover
3	Copyright
8	INTRODUCTION 1.0 SCOPE 2.0 NORMATIVE REFERENCES 3.0 DEFINITIONS 4.0 TEST DATA AND SAMPLE SIZE
9	5.0 LUMEN MAINTENANCE LIFE PROJECTION
10	6.0 TEMPERATURE DATA INTERPOLATION
12	7.0 REPORT ANNEX A – RATIONALE FOR THE RECOMMENDED DATA EXTRAPOLATION METHOD
14	ANNEX B – SAMPLE SIZE SELECTION FOR DATA EXTRAPOLATION
15	ANNEX C – LEAST SQUARES FORMULA ANNEX D – LIMIT FOR DURATION OF PREDICTION
17	ANNEX E – DATA TEST SET FOR VALIDATION OF CALCULATION – EXAMPLES
25	ANNEX F – CONSIDERATION OFMANUFACTURER’S PREDICTION MODEL
26	ANNEX G – ANALYSIS OF MATHEMATICAL MODELING AS A METHODOF PROJECTING LUMEN MAINTENANCE LIFE
32	INFORMATIVE REFERENCES