On Wed, 10 May 2006 17:59:59 -0400, The Visitor
wrote:



landing lights have limited
life, like 400 hours or so.

How many hours of flying does it take to get 400 hours on a landing
light? I've put well over a 1000 hours on the Deb but the landing
light hasn't been replaced yet.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

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.