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？
# q% a+ U- m* s

Nezof

LM-80 Measuring Lumen Maintenance of LED Light Sources
7 M8 ~9 V2 n, ]• Approved method for measuring lumen depreciation of solid-state (LED) light
# a9 [  w+ y$ L: y# vsources, arrays and modules.
" M, }3 |! l) ~' Z$ \- R• Does not cover measurement of luminaires.
5 D8 b9 ?+ F2 u( }• Does not define or provide methods for estimation of life.
' `% Y* N, k  `7 t- m+ v
TM-21 is a Technical Memorandum being developed by an
Illuminating Engineering Society (IES) technical committee
• It is currently in the IES vote/comment stage and therefore,
: Y+ M2 M4 z+ Mmay change before final publication
• Information provided here is preliminary and not
approved by IES

Nezof

• TM-21 does not determine traditional life or
( x- ~  p( }8 L/ L6 P3 U# n+ V0 Q1 b  }“time to failure” of an LED Lighting system
– The useful life of an LED system has many
* z- Q, K7 \4 R9 {' P: Wcomponents that need to be considered
(lamp, driver, lens, etc.)
– LEDs degrade (like all light sources) but for
# q' d3 g; Z3 I* I3 `+ gpotentially very long periods of time.  Instead
of outright failure, LEDs will eventually dim
to a point that is too low to serve their
purpose
• TM-21 does project the lumen maintenance
of an LED source (package/array/module)
. C* T0 h3 v8 D* X….. Which can then be used to project
the expected lumen output of the source
* D9 \5 V, O! i: k% E7 Z) jas part of a system (fixture)

gmr24185

学习了 谢谢

lxie

LM79和LM80有什么区别？