LED lighting reliability from a failure perspective

Shailesh, K R; Kurian, Ciji Pearl; Kini, Savitha G

doi:10.1109/iceteeem.2012.6494509

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…Shailesh et al [16] express the MTTF (Mean Time to Failure) as the time, in hours, to failure for non-repairable components like an integrated circuit soldered on a circuit board). Salata et al [17] reports for HL lamps an MTTF of 4000 hours whereas for CFL lamps an MTTF of 12.000 hours.…”

Section: Light Sourcesmentioning

confidence: 99%

Energetic and Economic Comparison of Lighting Systems in Historical Buildings: A Case Study

Liuzzi¹,

Chio²,

Rubino³

et al. 2019

IJES

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One of the greatest strategies in order to reach European energy goals can be considered the reduction of the primary energy consumption caused by the existing building. In order to reach a sustainable approach, the refurbishment of historical and traditional buildings in a holistic view must be taken into account. Between the various design processes, lighting aspects are fundamental, considering all the possible ways the building is used by the final user and also according to the climate context parameters. In the present study, a numerical simulation was performed by DIALux software on an existing Coastal Tower placed in Apulia Region, supposing to design the existing building as an exhibition hall. Using bibliographic data, a comparison between LED lamps and halogen and compact fluorescent lamps was carried out. Moreover, an economic and energy analysis was carried out by EcoCALC software demonstrating the potential energy and economic savings when using innovative solutions.

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Section: Light Sourcesmentioning

confidence: 99%

Energetic and Economic Comparison of Lighting Systems in Historical Buildings: A Case Study

Liuzzi¹,

Chio²,

Rubino³

et al. 2019

IJES

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show abstract

“…Voltage is adjusted using an autotransformer (3) to the value of 230 V, which is controlled by means of the voltmeter (4). The tested LED source is placed in the integrating sphere (6), which is located in the thermal test chamber (7). With the use of the measuring window (8), the measured signal (light) is led out from the test chamber by the optical fiber (9) of 12 mm in diameter.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…Currently, a strong demand has been observed in the field of LED sources which are commonly accepted as excellent replacements of classic light bulbs. Simultaneously with the development of LED sources, considerable interest has been noticeable also in the literature where studies of lighting and electrical parameters of LEDs have been presented, and LED-based applications have been considered [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. From the point of view of the average consumer, the fact of strong marketing conducted by the manufacturers of LEDs, which focuses only on the advantages of these types of light sources, is also notable.…”

Section: Introductionmentioning

confidence: 99%

Assessment of methods of marking LED sources with the power of equivalent light bulb

Tabaka

Rózga²

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. This article presents considerations on the assessment of marking LED sources with the power of an equivalent light bulb. This problem was studied both on the basis of calculations and measurements performed. 17 LEDs of different powers and luminous fluxes were tested. Calculations assessing conformity with the declared power showed that an important disadvantage for most of the LED sources results from the method of marking them with the power of an equivalent light bulb from the point of view of the luminous flux emitted. Manufacturers do not do this correctly, misleading the potential user. Meanwhile, measurements performed in different ambient temperatures indicated that for only 4 from among the 13 LED sources studied the given value of the power of an equivalent light bulb may be recognized as in accordance with the actual state of affairs and still with a reservation that specified ambient temperature shall be required. In other cases the values of power quoted are either understated or overstated.

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“…Most of the LED failure mechanisms reported in literature are related to thermal issues. 1 LED luminaires are strictly regulated for safety and quality standards; therefore it is the duty of the LED luminaire designer to guarantee that the LEDs do not overheat.…”

Section: Introductionmentioning

confidence: 99%

Measurement of junction temperature of light-emitting diodes in a luminaire

Shailesh

Kurian

Kini

2014

Lighting Research & Technology

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There are vast numbers of light-emitting diode (LED) luminaires to choose from, but not all LED luminaires perform reliably. More than half of the input electrical power to a LED luminaire is wasted in the form of heat. Heat management is the one of the most critical issues faced by LED luminaire designers. The long term reliability of a LED luminaire is mainly dependent on the junction temperature of the LEDs. Hence, accurate junction temperature information during luminaire operation is critical for monitoring and assessing the health of the luminaire. In practice, it is extremely difficult to measure the junction temperature of LEDs in modern day luminaires. With the optical system and heat sink surrounding the tiny LED, measurement of junction temperature with direct methods like infrared cameras and thermocouples becomes more complex. This paper explores the possibility of monitoring and measuring the junction temperature of LEDs in a luminaire by making use of the strong correlation between the forward voltage drop at the LED junction and the temperature of that junction. Results of thermal investigations of a LED downlight are presented. The results suggest that the inherent forward voltage/ junction temperature dependency of LEDs can be used to measure and monitor LED junction temperature in a luminaire under operational conditions.

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LED lighting reliability from a failure perspective

Cited by 11 publications

References 15 publications

Energetic and Economic Comparison of Lighting Systems in Historical Buildings: A Case Study

Energetic and Economic Comparison of Lighting Systems in Historical Buildings: A Case Study

Assessment of methods of marking LED sources with the power of equivalent light bulb

Measurement of junction temperature of light-emitting diodes in a luminaire

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