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Osram rates the life at 3000 hours (more) (archive)
[ Follow Ups ] [ 3-series (E46) Message Board ] [ Msg. Board FAQ ]
Posted by Glenn on February 28, 2000 at 08:46:11:

In Reply to: I heard 100,000 hours life expentancy (nt). posted by Scott on February 28, 2000 at 02:09:52:

Fewer on off cycles means longer life.

Two possible failure modes: 1) sputtering of electrode material onto the inside of the envelope so the less light gets out (slow, "soft" failure), 2) depending on how the things are sealed, gases can diffuse through the envelope to "poison" the discharge, reducing light output.

Glenn

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