Testing high brightness LEDs relative to application environment

Jeffrey Singer; Scott Mangum; John Lundberg

doi:10.1117/12.682290

12 September 2006 Testing high brightness LEDs relative to application environment

Jeffrey Singer, Scott Mangum, John Lundberg

Proceedings Volume 6337, Sixth International Conference on Solid State Lighting; 63371C (2006) https://doi.org/10.1117/12.682290
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

Application of light emitting diodes is expanding as the luminous output and efficiencies of these devices improve. At the same time, the number of LED package types is increasing, making it challenging to determine the appropriate device for use in lighting product designs. A range of factors should be considered when selecting a LED for an application including color coordinates, luminous efficacy, cost, lumen maintenance, application life, packaging and manufacturability. Additional complexities can be introduced as LED packages become obsolete and replacement parts must be selected. The replacement LED characteristics must be understood and assessed against the parameters of the original device, in order to determine if the change will be relatively simple or will force other end-product changes. While some characteristics are readily measured and compared, other factors, such as lumen maintenance, are difficult to verify. This paper will discuss the characteristics of a LED that should be considered during the design process as well as methods to validate these characteristics, particularly those which are not typically on data sheets or, are critical to the design and warrant additional validation. Particular attention will be given to LED lumen maintenance. While published manufacturer data typically provides temperature versus performance curves, the data may not be useful depending upon the application's operating environment. Models must be created to estimate the LED's junction temperature and degradation curve at the applied temperature in order to develop a more precise life estimate. This paper presents one approach to a LED device life and performance study designed with application environments in mind.

Citation Download Citation

Jeffrey Singer, Scott Mangum, and John Lundberg "Testing high brightness LEDs relative to application environment", Proc. SPIE 6337, Sixth International Conference on Solid State Lighting, 63371C (12 September 2006); https://doi.org/10.1117/12.682290

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KEYWORDS

Light emitting diodes

Temperature metrology

Manufacturing

Light sources and illumination

Calibration

Aerospace engineering

Power supplies

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