A novel measure to analyse the reliability of LED luminaires

A. N. Padmasali, S. G. Kini

Research output: Contribution to journalArticle

Abstract

LED luminaires are the most promising lighting solutions for general lighting in the current era due to their durability and lower power consumption. Reliability of LED luminaires is dependent on the electrolytic capacitor at the output stage of the LED driver as this is the weakest link failing the luminaire. So, it is required to develop a general measure to understand the effect of capacitance on the drive current and thus on the light output to analyse the reliability of the LED luminaire. To investigate the effect of capacitance and equivalent series resistance (ESR), a capacitor bank setup is developed, with values ranging from 0.017 μF to 860 μF. Six LED luminaires of different ratings and manufacturers are selected and drive current, and lumen output for each is studied. Based on the drive current ripple patterns observed, capacitors are classified into two classes, and also percentage flicker is determined. As driver capacitors decide the amount of ripple in the output current, a generalised measure of capacitance and ESR limit is established for the LED luminaire to work reliably. The work also helps in formulating metrics for determining the service life of an LED luminaire accurately.

Original languageEnglish
Pages (from-to)1063-1076
Number of pages14
JournalLighting Research and Technology
Volume51
Issue number7
DOIs
Publication statusPublished - 01-11-2019

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Lighting fixtures
Light emitting diodes
Capacitors
Capacitance
Lighting
Electrolytic capacitors
Service life
Durability
Electric power utilization

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

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abstract = "LED luminaires are the most promising lighting solutions for general lighting in the current era due to their durability and lower power consumption. Reliability of LED luminaires is dependent on the electrolytic capacitor at the output stage of the LED driver as this is the weakest link failing the luminaire. So, it is required to develop a general measure to understand the effect of capacitance on the drive current and thus on the light output to analyse the reliability of the LED luminaire. To investigate the effect of capacitance and equivalent series resistance (ESR), a capacitor bank setup is developed, with values ranging from 0.017 μF to 860 μF. Six LED luminaires of different ratings and manufacturers are selected and drive current, and lumen output for each is studied. Based on the drive current ripple patterns observed, capacitors are classified into two classes, and also percentage flicker is determined. As driver capacitors decide the amount of ripple in the output current, a generalised measure of capacitance and ESR limit is established for the LED luminaire to work reliably. The work also helps in formulating metrics for determining the service life of an LED luminaire accurately.",
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A novel measure to analyse the reliability of LED luminaires. / Padmasali, A. N.; Kini, S. G.

In: Lighting Research and Technology, Vol. 51, No. 7, 01.11.2019, p. 1063-1076.

Research output: Contribution to journalArticle

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