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？ 5 d- n8 U; g5 H" t3 q作者: Nezof 时间: 2012-11-5 13:41
LM-80 Measuring Lumen Maintenance of LED Light Sources 5 y! y8 s# g. s3 H: P9 F3 c• Approved method for measuring lumen depreciation of solid-state (LED) light 5 H: B) Z! Q- T' i: Q! q; f
sources, arrays and modules. 8 B6 U8 D5 r) Q/ ^& X6 p" W0 B• Does not cover measurement of luminaires.7 i" s; E6 ~0 R& a! f
• Does not define or provide methods for estimation of life. - C2 r% _) ?1 T , D4 z; D# h: f8 RTM-21 is a Technical Memorandum being developed by an / Z2 ]. e; M \. g
Illuminating Engineering Society (IES) technical committee 7 z8 u j [1 u4 e( T( O: `• It is currently in the IES vote/comment stage and therefore, 1 G v/ V0 B, J' w, W) {- V5 `0 Z
may change before final publication: [ A- g3 m4 l' g! E! ^1 Q
• Information provided here is preliminary and not / \) D$ N( z( C- W! A# }, Qapproved by IES作者: Nezof 时间: 2012-11-5 13:43
• TM-21 does not determine traditional life or E1 |8 n/ d" G$ R“time to failure” of an LED Lighting system 7 j9 i) f, b/ l9 D– The useful life of an LED system has many 8 g( H2 B4 O7 l( G- M1 y
components that need to be considered 9 f& w) v, J: S, U8 F
(lamp, driver, lens, etc.)8 t$ ~& }/ K( ?3 V( L! X1 Y
– LEDs degrade (like all light sources) but for . D9 D3 R) C' w+ N, u! W3 y1 xpotentially very long periods of time. Instead 7 ~) d' _# p$ Y ]! e/ n' |of outright failure, LEDs will eventually dim 9 v9 B3 d# O9 a. \6 z- S9 Gto a point that is too low to serve their ' w# w1 P1 E2 l% @) A
purpose 9 k/ x$ }, a& ~4 L( X+ j$ U
• TM-21 does project the lumen maintenance 9 T! X9 J" n y7 J8 k; ?$ b( U4 _
of an LED source (package/array/module)& ^6 r7 W9 E7 u2 U2 \
….. Which can then be used to project ' A& X. H* s! g5 n
the expected lumen output of the source * w$ b! Y9 F% }; Z1 p. j
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？