Long-life tungsten halogen lamp

摘要

A long life, two filament tungsten halogen lamp having light transmissive envelope, a first filament with a first lead, second lead, filament coil; a second similar filament, and a fill material is disclosed. The filament coil has an increased wire weight, increased over what is commonly used. The fill material comprises a halogen for the tungsten halogen cycle, a getter, and the remainder is approximately equal portions of krypton and xenon. The basic life improvement comes from the heavier tungsten wire weight, combined with the heavier molecular weight of xenon and krypton. The new filament and fill gives a two filament tungsten halogen lamp yielding substantially longer lamp life.