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Do anti-collision lights installed in aircraft lose their intensity over time and need to be replaced every few hundred hours of operation?

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  • $\begingroup$ Wouldn't the manufacturers love that. $\endgroup$ Commented Jun 17, 2015 at 20:22

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No, however the intensity is a feature of the bulb rather than the purpose.

Historically, incandescent bulbs were used, followed by Xenon flashtubes. Currently, LEDs are used in anti-collision lights and other lights on aircraft.

Please note that there are some requirements needed for bulbs used. They are mentioned in 14 CFR 25.1399:

Show a white light for at least 2 nautical miles at night under clear atmospheric conditions.

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    $\begingroup$ The Xenon flashtubes don't seem to lose intensity, but they do start to intermittently fail to fire as they age. LEDs OTOH are well known (as a general technology) to lose intensity over time. $\endgroup$ Commented Jun 17, 2015 at 16:05

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