"Vaughn" wrote in message
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"Morgans" wrote in message
...


For a bulb with no filament to break, with a expected "in use" burnout
time of 2,000 hours, it is unlikely you will ever need to replace the
bulk, and possibly the next dozen owners of the plane, as well.

Good point, but my first thought is that "stuff" happens. Bulbs get
broken, aircraft electrics sometimes produce damaging transients,

Well, in that case, stuff can hapen to the 1500 buck ballast with a wire.
Those same transients could take out the ballast on the wire, and perhaps
the bulbs, too.

and then there are stresses, vibrations, temperature changes etc. in
aircraft use that may not exist in automotive use and may well reduce that
2000 hours.

Evidence of users of HID bulbs in aircrafts suggests otherwise.

I use high-tech bulbs right here in my house that are supposed to last
thousands of hours. Yet somehow, I end up replacing a few every year.
Glad they don't cost $500.00 each.


Apples and oranges, when it comes to your long life bulbs. They have
filaments. These 500 dollar bulbs do not, therefore the only way vibration
can break them, is if it vibrates so bad that the bulb smashes into the side
of the reflector.

I don't know about yOu, but I would take care that I didn't drop, or let a
$500 bulb smash into the housing. ;-)
--
Jim in NC