How Long an LED Fixture Can Practically Function: Rated Life
Dear Reader: We believe generally that the typical focus during an LED buyer’s due diligence is on what can be expected during the initial performance…
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Projecting Long-Term Luminous, Photon & Radiant Flux Maintenance of LED Light Sources
The rated flux maintenance life of an LED is the elapsed operating time over which an LED light source maintains a given percentage of its initial light output. The flux maintenance of an LED light source is dependent upon many variables, including the operating temperature, drive current, and technology and materials used to construct the product. As such, the flux maintenance of LEDs can vary not only from manufacturer to manufacturer, but also between different LED package types produced by a single manufacturer. Further, it is important to consider the inherent limits to projected source life as extrapolated from test data. This document updates its recommended method of projecting the flux maintenance of LED light sources from the data obtained by IES LM-80 testing. The update of this document was accomplished by a dedicated TM-21 Working Group of LED industry professionals. The analy...
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Warranties Don’t Cover Everything
Dear Reader: Here’s a shocker: the Rated Life of an LED is not necessarily the same as the manufacturer’s warranty. In addition to Lumen Maintenance…
Lumen Maintenance: How Well a Fixture Holds Its Output
Dear Reader: The buyer of a new LED lighting system engaged in her/his due diligence can be faced with a dizzying array of considerations, and…
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