Investigates LED degradation in various conditions, comparing standard and realistic ageing tests.
This study investigates the degradation mechanisms of 2835-packaged white LEDs commonly used in residential lighting scenarios under various environmental conditions and explores how standard ageing tests compare to those that better reflect real-world use cases. The samples consist of commercially available LED strips, both cool and warm white. The luminous output of each LED on a strip is spectrally measured individually before ageing, then aged under particular conditions for a certain time and measured individually again. The measurements for a given LED are then analysed from multiple aspects, including material degradation processes during ageing, for example by following changes in phosphor efficiency.
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Ludvig et al. (2026) studied this question.
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