Natural and accelerated ageing of LED lamps

Hans Baumgartner; Dominique Renoux; Petri Kärhä; Tuomas Poikonen; Tomi Pulli; Erkki Ikonen

doi:10.1177/1477153515603757

Natural and accelerated ageing of LED lamps

Hans Baumgartner (Corresponding Author), Dominique Renoux, Petri Kärhä, Tuomas Poikonen, Tomi Pulli, Erkki Ikonen

Research output: Contribution to journal › Article › Scientific › peer-review

10 Citations (Scopus)

Abstract

Five different types of LED lamps were aged for 35 months at room temperature and for six months at the temperatures of 45., and 60.,. The lifetimes for the lamps were predicted from the luminous flux measurement results. The long-term tests show that early predictions of lifetime can be pessimistic. The results at higher temperatures show that ageing can be accelerated by modest heating. On the average, heating to 45., reduced the lifetime by a factor of 1.35 and heating to 60., by a factor of 2.36. An alternative accelerated method to test and analyse ageing is proposed. During the ageing of 35 months, the changes in correlated colour temperatures were smaller than 4.3%.

Original language	English
Pages (from-to)	930-942
Journal	Lighting Research and Technology
Volume	48
Issue number	8
DOIs	https://doi.org/10.1177/1477153515603757
Publication status	Published - 2016
MoE publication type	A1 Journal article-refereed

Keywords

engineering research
accelerated method
early prediction
LEd lamps
long term tests
luminous flux
natural and accelerated ageing
nocv1

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title = "Natural and accelerated ageing of LED lamps",

abstract = "Five different types of LED lamps were aged for 35 months at room temperature and for six months at the temperatures of 45., and 60.,. The lifetimes for the lamps were predicted from the luminous flux measurement results. The long-term tests show that early predictions of lifetime can be pessimistic. The results at higher temperatures show that ageing can be accelerated by modest heating. On the average, heating to 45., reduced the lifetime by a factor of 1.35 and heating to 60., by a factor of 2.36. An alternative accelerated method to test and analyse ageing is proposed. During the ageing of 35 months, the changes in correlated colour temperatures were smaller than 4.3%.",

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AU - Baumgartner, Hans

AU - Renoux, Dominique

AU - Kärhä, Petri

AU - Poikonen, Tuomas

AU - Pulli, Tomi

AU - Ikonen, Erkki

PY - 2016

Y1 - 2016

N2 - Five different types of LED lamps were aged for 35 months at room temperature and for six months at the temperatures of 45., and 60.,. The lifetimes for the lamps were predicted from the luminous flux measurement results. The long-term tests show that early predictions of lifetime can be pessimistic. The results at higher temperatures show that ageing can be accelerated by modest heating. On the average, heating to 45., reduced the lifetime by a factor of 1.35 and heating to 60., by a factor of 2.36. An alternative accelerated method to test and analyse ageing is proposed. During the ageing of 35 months, the changes in correlated colour temperatures were smaller than 4.3%.

AB - Five different types of LED lamps were aged for 35 months at room temperature and for six months at the temperatures of 45., and 60.,. The lifetimes for the lamps were predicted from the luminous flux measurement results. The long-term tests show that early predictions of lifetime can be pessimistic. The results at higher temperatures show that ageing can be accelerated by modest heating. On the average, heating to 45., reduced the lifetime by a factor of 1.35 and heating to 60., by a factor of 2.36. An alternative accelerated method to test and analyse ageing is proposed. During the ageing of 35 months, the changes in correlated colour temperatures were smaller than 4.3%.

KW - engineering research

KW - accelerated method

KW - early prediction

KW - LEd lamps

KW - long term tests

KW - luminous flux

KW - natural and accelerated ageing

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JO - Lighting Research and Technology

JF - Lighting Research and Technology

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Natural and accelerated ageing of LED lamps

Abstract

Keywords

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