INCANDESCENT LAMP HAVING HARDGLASS CAPSULE WITH EXTERNAL INFRARED REFLECTIVE COATING AND OUTER JACKET FILL GAS COMPRISING HELIUM

摘要

An incandescent lamp comprises a hermetically sealedhardglass envelope with a first fill gas including halogencontained by the envelope, at least one tungsten filamentsealed in the envelope and supported by lead-in wires, andan infrared reflective coating on an outside surface of theenvelope. An outer jacket encloses the envelope, the outerjacket having therein a second fill gas selected from agroup of fill gases, the group consisting of (1) helium and(2) a mixture of helium and hydrogen.