"The Visitor" wrote in message
...


landing lights have limited
life, like 400 hours or so.
From the GE website....
The 4509's I suspect you are using have a rated live of 25 hours. A Q4509,
more money is 100 hours. If you don't turn them on and off.

One person I know claims for longer life you should not turn the landing
light of until the engine stops. As the vibrations present when the
filament cools, stresses it and it will break sooner.

Which is part of the reason the Boom Beam is so great: NO FILAMENT.

Run it anytime, guaranteed five years. Install it and don't worry about it.