Tungsten halogen incandescent lamps containing mixed halogens

摘要

The invention provides a tungsten halogen linear incandescent lamp having a gas fill comprising a mixture of CHI.sub.3 and (PNBr.sub.2). sub. 3. Gas fills according to the invention comprise from 6 to 32 micrograms of (PNBr.sub.2).sub.3 per c.c. of the lamp internal volume with a ratio of CHI.sub.3 to (PNBr.sub.2).sub.3 of from 1:1 to 5:1 and result in lamps having a increased efficacy and a life of more than 2,000 hours.