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Various studies to identify the factors that affect the life of incandescent light bulbs in motor vehicles have been conducted by many different companies over many, many years.
English (United States)
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Effect of Filament Orientation on Incandescent Bulb Life
Various studies to identify the factors that affect the life
of incandescent light bulbs in motor vehicles have been conducted by many
different companies over many, many years.
designed experiment (DOE) was conducted utilizing a fixture containing numerous
motor vehicle signal lamp incandescent bulbs mounted to a vibration table. The vibration table was run at
vibration levels determined by real world measurements made from accelerometers
mounted directly on the tail lamp bulb in-vehicle and on-road. In addition, the bulbs in the DOE test
were cycled on-and-off per a duty cycle that mimicked results obtained from
real world in-vehicle tail lamp bulb usage measurements.
The figure above shows an incandescent vehicle bulb with its
filaments oriented vertically.
Bulb life data was monitored for the bulbs in the DOE test,
and subsequent statistical analysis showed that the orientation of the bulb
filament was a key factor that affected bulb life. Specifically, bulbs in the test with their filaments
oriented vertically failed sooner than bulbs with other filament
orientations. The plots below,
based on the DOE test results, show the predicted bulb failure rates for each
of the different filament orientations tested.
The data clearly shows that bulbs with their filaments
oriented vertically failed sooner and more often than bulbs with non-vertical