IES LM-84-14:2014 Edition

The method for measuring luminous flux and color
maintenance of LED light sources has been documented
in IES LM-80-08. At the solid-state lighting
(SSL) system level such as LED lamps, light
engines, and luminaires, other system components,
in addition to the LED light sources, also contribute
to luminous flux decay and color change over time.
The system performance changes over time can be
directly tested at the SSL product level. This document
addresses the evaluation of the changes in
performance of SSL systems over time and can be a
useful tool for engineering evaluations and luminous
flux maintenance for entire assemblies when environmental
considerations and variability for the base
LED deprecation is incorporated into the analysis.

Furthermore, performances of SSL systems, LED
integrated lamps, non-integrated lamps, LED light
engines, and LED luminaires, are typically but not
without exception affected by operational and environmental
variables such as operating cycle, conditions
imposed by auxiliary equipment and fixtures,
ambient temperature, airflow and orientation. This
test method has been developed to establish consistent
and environmental conditions across laboratories
to achieve reproducible results and to permit reliable comparison of results.