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？LM-80 Measuring Lumen Maintenance of LED Light Sources
• Approved method for measuring lumen depreciation of solid-state (LED) light
sources, arrays and modules.
• Does not cover measurement of luminaires.
• Does not define or provide methods for estimation of life.
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,
may change before final publication
• Information provided here is preliminary and not
approved by IES • TM-21 does not determine traditional life or
“time to failure” of an LED Lighting system
– The useful life of an LED system has many
components that need to be considered
(lamp, driver, lens, etc.)
– LEDs degrade (like all light sources) but for
potentially 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)
….. Which can then be used to project
the expected lumen output of the source
as part of a system (fixture) 学习了 谢谢 LM79和LM80有什么区别？
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