(57) An electric lamp having an envelope, a light-source capsule mounted within the envelope
and a containment coating. The containment coating, which is disposed substantially
over the outer envelope, has the capability of preserving the integrity of the envelope
from piercing, due to shard dispersion from the light-source capsule, in the unlikely
event that the capsule should fracture. One example of the coating consists of a fluoropolymer
material such as a perfluoroalkoxy resin (P.F.A. Teflon). The containment coating
is resistant to, and exhibits a high degree of tensile strength at, high temperatures
and is substantially unaffected by ultraviolet radiation. 1
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