(57) A double-enveloped tungsten halogen incandescent lamp having a light-source capsule
containment device wherein a knitted wire mesh surrounds the light-source capsule
and may be anchored to the capsule, stem, or lead-in wires. In the event of a burst
of the light-source capsule, the containment mesh substantially restricts shards of
the capsule from shattering the outer envelope of the lamp. In some embodiments, a
crumpled portion of the containment mesh is positioned above the capsule and provides
a collision-absorbing cushion in the event the capsule and mesh are propelled against
the outer envelope by the burst of the light-source capsule whereby further protection
against the shattering of the outer envelope is provided. Lamps with such containment
devices have improved operational safety characteristics.
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