| Electric tungsten/bromine cycle lamps are provided according to the invention with 2,2-diamino-4,4,6,6-tetrabromo-2,2,4,4,6-hexahydrotriazaphosphine, 2-amino-2,4,4,6,6-pentabromo-2,2,4,4,6,6-hexahydrotriazaphosphine or mixtures thereof as a phosphorusbromine-hydrogen source. It has b |