标题: lm80和TM21两个标准的差异是什么？ [打印本页] 作者: gmr24185 时间: 2012-11-5 12:22 标题: lm80和TM21两个标准的差异是什么？ lm80和TM21两个标准的差异是什么？; J( k7 a4 h0 h: Q8 O7 `+ U1 t 作者: Nezof 时间: 2012-11-5 13:41
LM-80 Measuring Lumen Maintenance of LED Light Sources ( R( ^+ h# ^# L0 \! @• Approved method for measuring lumen depreciation of solid-state (LED) light + E; O$ o) j b0 F
sources, arrays and modules.3 q8 O2 E9 ^7 e1 m5 e. k2 k s
• Does not cover measurement of luminaires. * {+ V' }* i; m6 C; l: C- U* D• Does not define or provide methods for estimation of life.7 U/ H% l9 c7 C
* ] Q9 n: c1 J$ a/ N% V8 xTM-21 is a Technical Memorandum being developed by an . S, E9 y$ s+ o, J* M
Illuminating Engineering Society (IES) technical committee 5 D9 b' g ]( o• It is currently in the IES vote/comment stage and therefore, , R0 _7 |3 u6 z; N3 J
may change before final publication : K& M, m& Y; J9 \; h• Information provided here is preliminary and not ) a. g4 L& J4 W" q5 Napproved by IES作者: Nezof 时间: 2012-11-5 13:43
• TM-21 does not determine traditional life or ) P1 W, n" L3 Z8 E“time to failure” of an LED Lighting system 1 d1 C* G, @% m– The useful life of an LED system has many - a7 K& j, a3 _0 o$ X
components that need to be considered e: s+ U' \" e {* k
(lamp, driver, lens, etc.) 8 T% I6 e. x0 S" i& Q, k– LEDs degrade (like all light sources) but for 5 o0 X" m* }1 A1 ^% b: f" L7 N, |
potentially very long periods of time. Instead 3 e3 B5 y* r7 sof outright failure, LEDs will eventually dim 1 s8 l6 ~! N& q- [7 ~* i0 A& Y8 Dto a point that is too low to serve their : Y$ [4 d! X# [$ L1 epurpose # E, T( k3 `5 b• TM-21 does project the lumen maintenance 6 {& R! Z$ P8 f$ U- O; C; aof an LED source (package/array/module)7 X! r0 A% [. i/ B4 b9 a7 y7 s
….. Which can then be used to project , G1 G& O5 _7 z4 F- v
the expected lumen output of the source . t3 z+ a' K, Y5 _% y
as part of a system (fixture)作者: gmr24185 时间: 2012-11-6 08:39
学习了 谢谢作者: lxie 时间: 2018-3-2 13:39
LM79和LM80有什么区别？