lm80和TM21两个标准的差异是什么？

gmr24185

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lm80和TM21两个标准的差异是什么？
! e/ L, d  m) R/ Q2 m, v" d

Nezof

LM-80 Measuring Lumen Maintenance of LED Light Sources
8 T3 v8 R+ ^9 Z: M: @• Approved method for measuring lumen depreciation of solid-state (LED) light
2 S8 H8 I! j; M3 A/ s: Q( z7 ksources, arrays and modules.
• Does not cover measurement of luminaires.
• Does not define or provide methods for estimation of life.
; q5 G. n- m7 B4 Y  `
TM-21 is a Technical Memorandum being developed by an
! _- G- P5 T& [1 c5 v2 xIlluminating Engineering Society (IES) technical committee
• It is currently in the IES vote/comment stage and therefore,
5 |% J) u' X* Umay change before final publication
• Information provided here is preliminary and not
approved by IES

Nezof

• TM-21 does not determine traditional life or
3 H: o3 a1 d. V: ]/ u% F3 ^% `: b“time to failure” of an LED Lighting system
: Q' b6 d& `/ ]( z% }4 H) W– The useful life of an LED system has many
7 G5 r- N) A# e: Y/ p+ L1 w' Acomponents that need to be considered
+ z4 E( O" h  S3 D8 n5 @(lamp, driver, lens, etc.)
– LEDs degrade (like all light sources) but for
4 I$ s: d1 @& ypotentially very long periods of time.  Instead
, R7 q! [8 y! O* Z  _0 N# _of outright failure, LEDs will eventually dim
! u4 |0 L- @: I$ x4 Y. [to a point that is too low to serve their
purpose
8 A7 x$ n  V- }' c- H• TM-21 does project the lumen maintenance
) I- b7 t+ b1 Q, \/ |) yof an LED source (package/array/module)
….. Which can then be used to project
( [8 B) ^& j# Y& g4 U: kthe expected lumen output of the source
as part of a system (fixture)

gmr24185

学习了 谢谢

lxie

LM79和LM80有什么区别？