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？, ]$ R% h: S1 B9 n- L 作者: Nezof 时间: 2012-11-5 13:41
LM-80 Measuring Lumen Maintenance of LED Light Sources! d* e( R1 | N
• Approved method for measuring lumen depreciation of solid-state (LED) light ; a# K* S- r7 R/ U7 P* _5 K
sources, arrays and modules. ! ^9 S1 m$ L+ G k6 Z8 O• Does not cover measurement of luminaires. ( k, W/ e- f& Z8 l• Does not define or provide methods for estimation of life. / w9 }! Y! I' E2 t 7 a2 s8 g* @& n# T ZTM-21 is a Technical Memorandum being developed by an & G, B" N6 |. ^, X l- _7 G, i6 \
Illuminating Engineering Society (IES) technical committee* f, u2 p$ ^ k4 Q) K- Y1 E6 U
• It is currently in the IES vote/comment stage and therefore, , t2 k4 \! g/ g: }7 x$ Cmay change before final publication 0 y1 Q4 P& y) K x# N& {2 k5 v• Information provided here is preliminary and not # A! j. f. ^# ?+ w& G
approved by IES作者: Nezof 时间: 2012-11-5 13:43
• TM-21 does not determine traditional life or , B6 I% [( s3 J2 [5 X) |7 D
“time to failure” of an LED Lighting system) d: P9 \2 t A2 l4 Z+ k% r* {
– The useful life of an LED system has many - {) L* n3 c4 Q- _% `components that need to be considered 0 G# ]. p1 m' e. l; g# |
(lamp, driver, lens, etc.) : L. R6 ?! @1 r, W/ D– LEDs degrade (like all light sources) but for 5 V% a/ t% I, kpotentially very long periods of time. Instead 0 a! Q5 z: G: Q, V& pof outright failure, LEDs will eventually dim + d2 L$ Q1 ^% O9 g" J
to a point that is too low to serve their - `; b' x+ v5 u: A3 {
purpose 6 Q' n. a: u4 @
• TM-21 does project the lumen maintenance 9 m* E: ^7 Y) T2 H! h' Y+ D
of an LED source (package/array/module) & h+ T' v( c g- X….. Which can then be used to project 8 B# j: g, U; r, v
the expected lumen output of the source # J' }1 P1 l; K# q
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？