1、IES TM-21-11Projecting nullong Ternull nullnullnullen Mnullintennullnce onull nullEnull nullignullt SonullrcenullIES TM-21-11Projecting Long Term Lumen Maintenance ofLED Light Sources Publication of this Committee report has been approved by IES.Suggestions for revision should be directed to IES.Pre
2、pared by:The Subcommittee on Sonullid State Lighting of the IES Testing Procedures nullommitteeIES TM-21-11Copyright 2011 by the Illuminating Engineering Society of North America.Approved by the IES Board of Directornullnull nulluly 2nullnull 2011null anull a nullrannullaction of the Illuminating En
3、gineering Society of North AmericaAll rightnull renullerved. nullo part of this publication may be reproduced in any formnull in any electronic retrieval system or othernullisenull nullithout prior nullritten permission of the IES.Published by the Illuminating Engineering Society of nullorth nullmer
4、icanull 12null nullall Streetnull nullenull nullornullnull nullenull nullornull1nullnullnullnull.IES Standards and nulluides are developed through committee consensus and produced by the IES nullffice in nullenull nullornull. Careful attention is given to style and accuracy. If any errors are noted
5、in this documentnull please for-nullard them to nullita nullarroldnull nullirector of Technologynull at the above address for verification and correction. The IES nullelcomes and urges feedbacnull and comments. nullrinted in the nullnited Statenull of America.ISBN null nullnullnullnull0nullnullnulln
6、ullnullnullnull2nullnullnullnullDISnullLnullIMEnullIES publications are developed through the consensus standards development process approved by the nullmerican nullational Standards Institute. This process brings together volunteers represent-ing varied vienullpoints and interests to achieve conse
7、nsus on lighting recommendations. nullhile the IES administers the process and establishes policies and procedures to promote fairness in the development of consensusnull it manulles no guaranty or nullarranty as to the accuracy or completeness of any information published herein. The IES disclaims
8、liability for any innullury to persons or property or other damages of any nature nullhatsoevernull nullhether specialnull indirectnull consenulluential or compensatorynull directly or indirectly result-ing from the publicationnull use ofnull or reliance on this documentIn issuing and manulling this
9、 document availablenull the IES is not undertanulling to render professional or other services for or on behalf of any person or entity. nullor is the IES undertanulling to perform any duty onulled by any person or entity to someone else. nullnyone using this document should rely on his or her onull
10、n independent nulludgment ornull as appropriatenull seenull the advice of a competent professional in determining the enullercise of reasonable care in any given circumstances.The IES has no ponullernull nor does it undertanullenull to police or enforce compliance nullith the contents of this docume
11、nt. nullor does the IES listnull certifynull test or inspect productsnull designsnull or installations for compliance nullith this document. nullny certification or statement of compliance nullith the renulluirements of this document shall not be attributable to the IES and is solely the responsibil
12、ity of the certifier or manuller of the statement.IES TM-21-11Prepared by the Subcommittee on Sonullid State Lighting of the IES Testing Procedures nullommitteeTM-21 nullornulling nullroupSonullid-State Lighting SubcommitteeTesting Procedures nullommitteenullanullphTuttnullenull Technicanull nulloor
13、dinatornullei nullaraguchiMarnull nullodappnulliannullhong nulliaoCameron Millernulloshi nullhnoTrenton PulsipherEmil nulladnullovEric nullichmannullavid Snullombatfalvynullameron Minullnullernull nullhairnull. nulldinolfinullC. nullndersennull. nullndersennull. nullanullernullnull. nullergernull. n
14、ullergmannull. nullradleynullE. nullretschneidernull. Channullnull. Channullnull. ChennullP-T. Chounullnull. Colemannullnull. CurryE. nullaubachnullM. nullyblenullS. Ellersicnullnullnull. Ellisnull. nullrandinnullM. nullrathernull. nullaraguchinull. nullechfellnernullnull. nullemminullS. nullermannu
15、llT. nullernandenullnullnull. nulliebertnullnull. nullospodarsnullynull. nulluanullnull. nullulettP-C. nullungnullnull. nullacnullsonnullnull. nullangnull. nullennullinsnull. nulliaonull. nullungnullnull. nullahnnullM. nullalnullasnullnull. nullarabelasnull. nullashaninullP. nulleeblernullM. nullolt
16、rebainull. nullruegernull. nulleeM. nullehmannullnull. nullinnulluatanullnull. nulludynullannullnull. MarellaM. MayerM. McClearnullnull. Mcnulleenull. nullausnullnull. nullealnullnull. nullhnonullS. PatelnullE. nulladnullovS. nullanenullE. nullichmanM. nullieblingnullI. nullossonullnull. nullynullon
17、ullsnullinullE. SahanullanullM. Sapcoenull. Schutnullnull. Scottnull. Shaefernullnull. Shumnullnull. Staffordnullnull. SteinbergT. Tomonaganullnull. Trottnullnull. Tuttlenull. nullennullataramanannullnull. nullelchnullnull. nullilconullnullnull. nullonnull. nullhangMichaenull nullrathernull nullhair
18、null. nullyersnullC. nullndersennull. nullanullernullnull. nullergernull. nullergmannull. nullerginnullE. nullretschneidernullnull. nullroughtonnullnull. nullahlnullnull. nullaubachnullnull. Ellisnull. nulloynullP. nullrancnullnullnull. nulleinischnullT. nullernandenullnullnull. nullorannull. nullos
19、podasnullyS. nulluanullP. nullungnullnull. nullusbynullnullS. nulluttonnullnull. nullennullinsnullnull. nulliaoM. nullalnullasnull. nullarambelasnull. nullelleynullM. nullotrebainull. nullrugernull. nullueblernullnull. nullanulltonnullnull. nulleetnullonullnullnull. nullerbsnullnull. nullevinnullI.
20、nullenullinnull. nullonullnullnull. Marellanull. McnulleeC. Millernull. Moshernull. nullenulllandnull. nullhnonullnull. PlannullnullE. nulladnullovnull. nullandolphE. nullichmannullM. nullieblingnullnull. nullonnulluillo-nullmatannullM. Sapcoenull. Schutnullnullnull. Smithnullnull. Specnullnullnulln
21、ull. Staffordnullnull. Steinbergnull. nullagnernullnull. nullalnullernullnull. nullelchnullnull. nullilconullnullnull. nullonnullnull. nullhangAdvinullory nullembernullnullonorary nullembernullnullIES TM-21-11IES TM-21-11nullontentsIntroduction. . . . . . . . . . . . . . . . . . . . . . . . . . . .
22、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11nullnull Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12nullnull nullormatinulle nulleference
23、s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1nullnullnull Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1null
24、null1 LED Light Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1nullnull2 DnullT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . 1nullnullnull nullated Lumen Maintenance Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1nullnullnull Test Data and Sampnulle Sinulle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26、. . . . . . . . 1nullnull1 Data to be nullsed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1nullnull2 Sampnulle Sinulle nullecommendation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . . . . 1nullnullnull Luminous nullnullunull Data nullonullnullection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2nullnullnull Lumen Maintenance Life Projection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28、 . . . . . . . . . . . . . . . 2nullnull1 Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2nullnull2 Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、. . . . . . . . . . . . . . . . . . . . . . 2null.2.1 nullormalinullation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2null.2.2 nullverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30、 . . . . . . . . . . . . . . . . . . . . . 2null.2.null nullata nullsed for Curve-fit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2null.2.null Curve-fit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31、. . . . . . . . . . . . . . . . . . . . . 2null.2.null nulldnullustment of nullesults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnull.2.null nullotation for nullumen Maintenance nullife . . . . . . . . . . . . . . . . . . . . . . .
32、. . . . . . . . . . . . . . . . . . . nullnullnullnull Temperature Data Interponullation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnullnull1 Senullection of Test nullase Temperatures. . . . . . . . . . . . . . . . . . . . . . . .
33、 . . . . . . . . . . . . . . . . . . . . . . nullnullnull2 nullonnullert nullnullnull Temperatures to nullenullnullins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnullnullnull nullse the nullrrhenius Enulluation to nullanullcunullate the Interponul
34、lated Lumen Maintenance Life . . . . . . . . nullnullnullnull nullppnullicabinullity of the nullrrhenius Enulluation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnullnullnull Limit for Enulltraponullation. . . . . . . . . . . . . . . . . . . . . . . . .
35、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnullnullnull nulleport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnullnnenull null nullationanulle for the nullecommend
36、ed Data Enulltraponullation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnullnnenull null Sampnulle Sinulle Senullection for Data Enulltraponullation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnullnnenull null Least Snulluares nullormunu
37、lla. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnullnnenull D Limit for Duration of Prediction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nullnullnnenull E Data Test Set
38、for nullanullidation of nullanullcunullation null Enullampnulles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1nullnullnnenull null nullonsideration of Manufacturernulls Prediction Modenull. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1nullnullnnenull null nulln
39、anullysis of Mathematicanull Modenulling as a Method of Projecting Lumen Maintenance Life . . . 1nullInformatinulle nulleferences. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2nullIES TM-21-111IES TM-21-11Projecting
40、Long Term Lumen Maintenance of LED PacnullagesInullTnullnullDnullnullTInullnullnullne of the benefits that nullEnull light sources can provide is very long usable life. nullnlinulle other lighting technologiesnull nullEnulls typically do not fail catastrophi-cally during use. nullonullevernull over
41、time the light output nullill gradually depreciate. nullt some point in timenull the light emitted from an nullEnull depreciates to a level nullhere it is no longer considered adenulluate for a specific application. It is important in lighting design to understand nullhen this nulluseful lifetimenul
42、l of an nullEnullsource is reached. IES null-null-null is the nullproved Method for Measuring nullmen Maintenance of nullnullnullght Sources. It defines the setupnullconditionsnulland procedures for perform -ing lumen maintenance testing of nullnullpacnullgesnullarraysnulland modules. null-null-null
43、 is the IES recom -mendation that is used nulldely to characterinulle the lumen depreciation behavior of nullnull. nullnulldevice manufacturers routinely provide null-null-null reports for their products nullth data collected during test -ing for nullnull hours or more. null evernullhonullthe data c
44、ollected from null-null-null testing are actually used to best determine the useful lifetime of the tested product is not nullell defined. The rated nullumen Maintenance life of an nullEnull is the elapsed operating time over nullhich an nullEnull light source maintains a given percentage of its ini
45、tial light output. It is defined as nullpnull nullhere p is the percentage value. nullor enullamplenull nullnullnullis the time nullin hoursnull nullhen the light out-put from the nullEnull has dropped to nullnullnull of its initial out-put. The time nullhen the rated lumen maintenance life of an nu
46、llEnull light source is reached is dependent upon many variablesnull including the operating temperaturenulldrive currentnull and the technology and materials used to construct the products. nulls suchnull the lumen mainte-nance of nullEnulls can vary not only from manufacturer to manufacturernull b
47、ut also betnulleen different nullEnull pacnullage types produced by a single manufacturer.This Technical Memorandum recommends a method of pronullecting the nullumen Maintenance of nullEnull nullight Sources from the data obtained by nullM-nullnull-nullnull testing. This document nullas developed by
48、 a dedicated TM-21 nullornulling nullroup of nullEnull industry professionals. The analyses of the nullM-nullnull-nullnull test data provided by manullor nullEnull manufacturers are used to rationalinulle and support this document. Much of this nullM-nullnull-nullnulldata nullere from testing that e
49、nulltended to 1nullnullnullnull hours and beyond. 1nullnull SnullnullPEThis document provides recommendations for pro-nullecting long term lumen maintenance of nullEnull light sources using data obtained nullhen testing them per IES nullM-nullnull-nullnullnull nullIES nullpproved Method for Measurin
50、g nullumen Maintenance of nullEnull nullight Sources.null 2nullnull nullnullnullMnullTInullE nullEnullEnullEnullnullESIES nullM-nullnull-nullnullnull Approved nullethod for nulleanulluring nullumen nullaintenance of nullED nullight Sourcenull. nullnullnull DEnullInullITInullnullS nullnull1 LED Light
