Using Degradation Data to Improve Fluorescent Lamp Reliability


Tseng, Sheng-Tsaing; Hamada, Michael; Chiao, Chih-Hua   (1995, ASQC)   National Tsing-Hua University, Hsinchu, Taiwan; Bellcore, Morristown, NJ; Soochow University, Taipei, Taiwan

Journal of Quality Technology    Vol. 27    No. 4
QICID: 11428    October 1995    pp. 333-369
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Article Abstract

While statistically designed experiments have been employed extensively to improve product or process quality, they have been used infrequently for improving reliability. In this paper, we present a case study which used an experiment to improve the reliability (or lifetime) of fluorescent lamps. The effect of three factors from among many potentially important manufacturing factors was investigated using a fractional factorial design. For fluorescent lamps, failures occur when their luminosity or light intensity falls below a certain level. An interesting feature of this experiment is the periodic monitoring of the luminosity. The paper demonstrates how the luminosity's degradation over time provides a practical way to improve fluorescent lamps which are already highly reliable. Recommendations based on the experiment's results suggest that nearly a 70% improvement can be realized.


Fractional factorial design,Reliability,Case study

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