Tungsten Filament used in Incandescent lamp,GLS lamp,is uniformity in pitch,shape,color,luster ... -standard filaments. They are widely used in incandescent lamp, energy-saving lamp, auto lamp, halogen lamp,GLS lamp and other special lamp ... ) Piece weight: ±3%mg5) Cold resistance: ±3%ohm Tungsten Filament,Incandescent lamp,GLS lamp