My 1976 Cessna 172M uses a PAR 46 size GE4537 lamp for
the landing light (12V, 100W). It is mounted in the lower cowling
under the prop and does not last very long. I suppose the vibration
of the engine kills the life of the bulb. I sure wished Cessna had designed
this landing light installation to allow for replacing the lamp without
having
to remove the cowling. What a pain to replace a light.

I've tried the "rotate it 90 degrees in the holder" trick, but could not
tell that this helped any.

Many people recommend the Quartz Q4509 as a longer life replacement
for the GE 4509 PAR36 size lamp. A best as I can determine, there is no
Quartz version of the 4537. If you have seen these, please let me know
where.

Any other suggestions for a replacement lamp for a GE4537 lamp that
might prove to have a longer life?

Ronnie