Tungsten filament can be used in energy-saving lamp, it is uniformity in pitch,shape,color, luster and piece weight,long life. Tungsten ... are widely used in general incandescent lamp, energy-saving lamp, fluorescent lamp, auto lamp, halogen lamp and other special lamp.Based on advanced equipments and technology ... ) Piece weight: ±3%mg3) Cold resistance: ±3% ohm Energy-Saving Lamp Tungsten filament