It is the Illuminating Engineering Society of North America (IESNA) approved method for taking LM-80 data and making useful LED lifetime projections. The standards apply to lifetime projection of LED package, array or module alone. The results can then be used to interpolate the lifetime of an LED source within a system (luminaire or integrated lamp) using the in-situ LED source case temperature.
Who can perform testing?
There is not such a thing as testing, it is a mathematical method based on LM-80-08 collected data.
Among other thing, TM-21-11 will consider:
What does it provide?
The method will provide a projected lifetime for the LED source or system.
Life notation results will then use the following standardized nomenclature: Lp (Yk)
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