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Philips Lumileds addresses LED array lifetime performance

Update time:2011-02-24 16:18:00Click :7316Times
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A new white paper explains how luminaire manufacturers can analyze the true lifetime of their products.

Philips Lumileds has published a white paper entitled “Evaluating the Lifetime Behavior of LED Systems” that 

describes a methodology for evaluating how arrays of LEDs behave over time, and how LED luminaire manufacturers 

can confidently make business decisions such as warranty commitments. 

The intention of the white paper, says Lumileds, is to go beyond simple lumen maintenance data that describes 

how a single LED behaves. The paper addresses lighting systems, which use multiple LEDs in a wide variety of 

usage conditions.

An LED luminaire's usable life is determined by a manufacturer's determination of expected lumen maintenance

and by the actual usable life of the many components included in the system. Each of the components must be 

analyzed independently in order to provide an accurate assessment.

Philips Lumileds has collected and analyzed over 700 million hours of Luxeon LED reliability test data. Using 

statistical analysis and models that have long been used and proven in the automotive and electronics industries, 

Philips Lumileds paper describes how a luminaire manufacturer can define the "lifetime" of the LEDs in a system 

and understand how to scale from the behavior of one LED to many LEDs. This is an essential process for anyone 

that is developing product warranties and results in clear understanding of "lifetime" of the LEDs.

"Luminaire manufacturers no longer have to rely on the lumen maintenance behavior of a single LED as a proxy 

for the lifetime," said Rudi Hechfellner, Director of Applications. "With these new methods, companies can now 

balance business objectives with engineering realities to provide products and warranties that the market wants 

and can have confidence in." The white paper covers the following topics:

· The 'failure' modes of power LEDs, and their impacts on luminaire reliability.

· Long-term LED performance testing: the foundation of reliability data.

· How reliability models are derived.

· What the models tell lighting manufacturers about LED behavior over time.

· Predicting the "lifetime" of an LED array

"Evaluating the Lifetime Behavior of LED Systems" is publicly available via the Philips Lumileds website or the Future 

Lighting Solutions website.