If you have ever dropped a handlamp or knocked a lit table lamp off its table then you will know that a tungsten filament heated to well over 1000 deg.C is much, much more fragile than a cold one. Thus if you want to reduce your operating costs never have a landing/taxy light on when starting a piston engine because of the severe vibration generated as the engine first fires up.
I can remember years ago our engineers moaning about the poor life and high replacement cost of our landing/taxy sealed beam units on school A/C. Simple solution: visit the local autospares place: The equivalent car sealed beam units were a direct replacement, lasted for ages and cost a fraction of that of the approved aviation spare!
P.P.