A full characterization of commercial power LEDs for general lighting application was performed in order to identify the more proper bias condition. Continuous and pulsed operating conditions were investigated taking into account the initial device efficiency, in term of output optical power over dissipated electrical power, and the operating temperature. The aim of this work was to establish the better compromise of bias condition with small power waste and long devices operating life. The DC bias shows better characteristics in term of devices initial efficiency, but high operating temperature avoidable with a good but usually expensive heat sink. High current pulsed bias results in lower efficiency, but, also, lower average operating temperature leading to longer lifetime.
Characterization of power LEDs for general lighting application
LEVADA, SIMONE;MENEGHESSO, GAUDENZIO;SPIAZZI, GIORGIO;BUSO, SIMONE;FIORENTIN, PIETRO;ZANONI, ENRICO
2004
Abstract
A full characterization of commercial power LEDs for general lighting application was performed in order to identify the more proper bias condition. Continuous and pulsed operating conditions were investigated taking into account the initial device efficiency, in term of output optical power over dissipated electrical power, and the operating temperature. The aim of this work was to establish the better compromise of bias condition with small power waste and long devices operating life. The DC bias shows better characteristics in term of devices initial efficiency, but high operating temperature avoidable with a good but usually expensive heat sink. High current pulsed bias results in lower efficiency, but, also, lower average operating temperature leading to longer lifetime.Pubblicazioni consigliate
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