Landing lights

The Visitor wrote:
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.

Sagging engine mounts will let the engine's bumper plate come
up against the cowl bumper. You can see it just above the landing light
assembly. If this thing is constantly in contact, it will shake the
daylights out of the cowl and anything attached to it.
Sometimes getting a dynamic prop balance will help; it saves
radios and gyros, too.

Dan