LED life prediction based on lumen depreciation and colour shift

A. N. Padmasali, S. G. Kini

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Light emitting diodes, with advantages in energy savings, luminous efficacy and greater reliability, are becoming preferred over conventional white light sources. Currently, only light output depreciation is considered for life estimation of light emitting diode luminaires but it is recommended to include colour shift variations for applications demanding colour stability. In this paper, an extended Kalman filter is employed to determine L70 life and colour temperature degradation over life of a light emitting diode luminaire. The colour shift in terms of Duv is determined by statistical polynomial cure fitting. The variation in chromaticity coordinates over life is determined and life based on colour shift is determined by acceptable Duv limits. The results are compared to life determined by the IES-TM-21 method and the correlated colour temperature limits taken from the luminaire data sheet.

Original languageEnglish
Pages (from-to)84-99
Number of pages16
JournalLighting Research and Technology
Volume49
Issue number1
DOIs
Publication statusPublished - 01-02-2017

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Depreciation
Light emitting diodes
Color
Lighting fixtures
Extended Kalman filters
Light sources
Energy conservation
Polynomials
Degradation
Temperature

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

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LED life prediction based on lumen depreciation and colour shift. / Padmasali, A. N.; Kini, S. G.

In: Lighting Research and Technology, Vol. 49, No. 1, 01.02.2017, p. 84-99.

Research output: Contribution to journalArticle

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